Planche 1 issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.64, Fig.140].
Female (from Izu region): a, habitus (dorsal); b, forehead (left lateral side); c, last thoracic segment and urosome (left lateral side); d, rostrum (dorsal view); e, Mx2; f, P1; g, P2; h, P3; i, P5.

Nota Female:
- Cephalothorax about 4 times the abdomen length. 4th and 5th pedigers fused.
- Posterolateral corners of the last thoracic segment rounded but there is a sudden change in outline along the dorso-lateral corner.
- Rostrum with rami robust, terminate in fine filaments.
- Abdominal segments and caudal rami proportional lengths 39 : 21 : 19 : 7 : 14 = 100.
- Genital segment as long as wide, slightly swollen ventrally; there is a transverse row of minute spinules on the proximal part near junction with the cephalothorax.
- Caudal rami slightly longer than wide.
- A1 23-segmented; extends to the distal end of the caudal rami..
- A2 exopod 1.2 times as long as endopod.
- Mx1 with 7 long and 2 short setae on the outer lobe; 9 setae on exopod; 5+3 setae on endopod; 5 setae on the 2nd basal; 4 setae on the 3rd inner lobe; 2 setae on the 2nd inner lobe; 13 setae on the 1st inner lobe (= arthrite).
- Mx2 has 5 bud-like sensory filaments of about equal in size, and 3 long worm-like ones on the distal segments.
- Mxp with a tuft of hairs at base of the bud-like sensory filament on the 1st basal segment, which arises from the middle of the external margin; 4th lobe with, beside 3 usual setae, a small rounded process near the distal border.
- P1 with the 1st exopodal segment 1 outer edge spine reaching the distal margin of 2nd segment.
- P2 with the 1st exopodal segment a long and curved outer edge spine, exceeding the middle of the outer margin of the 2nd segment. Terminal spine of exopod with 32 teeth.
- P3 with 22 teeth on terminal spine of exopod.
- P5 3-segmented. Distal segment with a strong inner marginal spine, coarsely denticulated along the anterior margin; terminal spine short, about 1/3 the length of the inner marginal spine; there is on the outer margin 1 small spine at base ot the terminal spine, and 1 small outer marginal spine opposite to the inner marginal spine. Posterior surface of segments furnished with a group of spines.

Planche 2 issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.65, Fig.141].
Male (from Izu region): a, forehead (left lateral side); b, thoracic segments (left lateral side); c, rostrum (dorsal view); d, A2; e, Mx2; f, P1 (posterior view); g, P2; h, P3; i, P4; j, P5.

Nota Male:
- Cephalothorax about 2 times the abdomen lenth.
- 4th and 5th pedigers incompletely fused, line of fusion clearly seen in lateral aspect.
- Rostrum as in female, but the basal rami much stronger.
- Urosome 5-segmented; segments and caudal rami in proportional lengths 9 : 32 : 27 : 25 : 2 : 5 = 100.
- 2nd and 3rd abdominal segments fringed with fine teeth on the distal border.
- Caudal rami divergent, a little wider than long.
- A1 20-segmented on left sie, 19-segmented on right side; extends to the distal end of the 2nd abdominal segment.
- A2 exopod 1.2 times as long as endopod; 1st exopodal segment furnished with short hairs along the anterior margin.
- Md and Mx1 as in female.
- Mx2 bears 5 bud-like sensory filaments and 4 worrm-like on the distal segments, one of the latter is much larger than the others.
- P1 with 1 outer edge spine on , extending to the middle of the 2nd segment.
- P2 with 1 outer edge spine on the 1st exopodal segment, curved considerably at the distal end. Terminal spine of exopod with 32 teeth.
- P3 with on the 2nd basal segment (= basis) rows of spinules along anterior distal border. Terminal spine of exopod with 20 teeth.

Planche 3 Issued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XLIX, figs.22-27]. As Scolecithrix propinqua.
Female: 22, habitus (dorsal); 23, idem (lateral left side); 24, rostrum; 25, endopodal segments of P2; 26, endopodal segments of P3; 27, P5.

Nota Female (as Amallothrix propinqua):
- Posterolateral corners of the last thoracic segment slightly obtusely rounded.
- Rostrum comparatively shorter than A. gracilis, but of the same structure.
- Urosome length about 1/4 of prosome.
- Genital segment as long as two following segments together, slightly swollen ventrally.
- Caudal rami small and slightly divergent.
- A1 reaches end of caudal rami.
- A2, mouthparts and swimming legs similar to those A. gracilis.
- P5 resembles those A. gracilis, distinctly biarticulate; proximal segment shorter than distal and hairies outside at end; distal segment furnished with of number rigid hairies outside, segment obliquely truncate at yje extremity and with 2 spines, 1 inner very strong and 1 smaller at apex.

Planche 4 issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.63].
Female: Proportional lengths of segments of A1.
-A1 23-segmented. Segments 14 and 18 with each a proximal seta.

Planche 5 issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.66].
Male: proportional lengths of segments on the left side of A1.
- A1 20-segmented on the left side; 19-segmented on the right side. Segments 14, 18, 21, 22 and 25 have each a long seta. Proximal segments with well-developed aesthetascs.