286 



and a well-developed appendix masculina. The stylamblys, implanted near the proximal third, 

 measures a little more than one-third the length of the endopodite and is styliform, 13 to 

 1 4-times as long as thick ; the margins bear a few long feathered setae, while one observes on 

 the tip a cluster of cincinnuli. Just before the stylamblys the much thicker appendix masculina is 

 implanted, that reaches to the distal fourth of the endopodite; it is 6-times as long as broad, 2 1 / 2 -times 

 as thick as the stylamblys and the truncated tip bears 6 or 7 spiniform, partly pectinated setae. 

 Of the 2 nd pleopod (Fig. 68//, 68/) of the female the outer branch is well-developed, about 

 4-times as long as wide, and a little longer than the protopod; the endopodite is rudimentary, 

 hardly half as long as the outer branch, 4-times as long as broad, and has 110 stylamblys. In order 

 to spare the specimens that are in a poor condition, the other pleopods have not been examined. 



7. Pontophilus japonicus Doflein. PI. XXIII and XXIV, Fig. 69 — 6oy'. 



Pontophilus japonicus F. Doflein, Abhandl. K. bayer. Akad. Wiss. II Cl. XXI Bd. III Abth., 

 München 1902, p. 621, Taf. III, fig. 6. 



Stat. 95. June 26. 5°43'.5 N., ii9°4o'E. Sulu Sea. 522 m. Stony bottom. 1 female without eggs. 

 Stat. 105. July 4. 6°8'N., 121° 19' E. North of Sulu-island. 275 m. Coraibottom. 1 male. 



Upon my request Professor Zimmer of Munich has been so kind to examine for me the 

 single type specimen, a female, of Pont. japoninis Dofl. from Sagami bay, Japan : the results 

 of this examination are the following-. 



In the first place the outer margin of the antennal scale, which was not described by 

 Doflein, proved to be finely denticulated along the two proximal third parts, in the 

 second place the pleura of the i st — 5 th abdominal somites are quite unarmed, so that the 

 words in Doflein's description "Die Seitenteile der ersten fünf Segmente tragen unten je einen 

 Stachel" have no sense and in the third place the sides of the carapace between the lower 

 margin and the mid-dorsal line are provided with only four carinae, not with live, as was 

 erroneously described by the author. Prof. Zimmer added moreover a sketch of the carapace 

 and the abdomen, made by means of a drawing apparatus. As the two specimens, collected 

 by the "Siboga", now fully agree, after this rectification, with Doflein's description and with 

 Prof. Zimmer's sketch, they are referred to Pont. japonicus. 



Both specimens are of a small size, probably not yet full-grown. Measured in the mid- 

 dorsal line, the male proves to be 12,45 mm - l° n g" (carapace 3,6 mm., abdomen 8,85 mm.), the 

 female 13,75 mm. (carapace 4,1 mm., abdomen 9,65 mm.). The rostrum of the male (Fig. 69a) 

 closely resembles the textfigure B in the original description and, measured in the middle line as 

 far as the level of the orbital margin, proves to be 0,6 mm. long, i. e. one-fifth the length 

 of the rest of the carapace; the lateral margins are concave and curve regularly irito the orbital 

 margins, that are entire, not notched; the breadth of the rostrum in the middle is four-fifths 

 the length and the anterior margin is emarginate and concave in the middle; the antero-external 

 angles are acute and 0,68 mm. distant, a little more than the rostrum, which is longitudinally 

 channelled above, is long. Looked at from before the rostrum appears to be turned downward, the 

 lateral margins converging to the obtuse tip, the anterior margin appears then regularly concave 



