o 



5 



f Clasping organ of the lower antennular flagellum 

 without any protuberance on the upper margin of 

 the curved part of the "branch". Petasma has a well 

 developed pars astringens with the row of marginal 



coupling hooks A. Sibogcv n. sp. 



ff Clasping organ of the lower antennular flagellum with 

 a conspicuous protuberance directed backwards from 

 the angularly bent upper margin of the "branch". 



Petasma without pars astringens A. serrtilatus Kr. 



p. Ciliated part of the outer margin of the exopod of the 



uropods nearly or fully as long as the glabrous part . . A. dispar n. sp. 

 b. Trochanter of third pair of legs with a conspicuous triangular 



tooth on the inner margin near its distal end A. spiniger n. sp. 



Key to the Females. 



A. Ciliated part of the outer margin of the exopod of the uropods con- 

 spicuously shorter than the glabrous part. 



a. Trochanter of third pair of legs without any tooth on its inner 



margin near the end. . A. vu/garis n. sp., A. Sibogce n. sp., and A. serrtilatus Kr. 



b. Trochanter of third pair of legs with a conspicuous triangular 



tooth on the inner margin just before the end A. spiniger n. sp. 



B. Ciliated part of the outer margin of the exopod of the uropods nearly 



or fully as long as the glabrous part. A. dispar n. sp., and A. chinensis n. sp. 



i. Acetes vulgaris n. sp. PI. III, figs. 2a — 2r. 



Stat. 4. March 9. Lat. 7°42' S., long. II4°I2'.6'E. Anchorage off Djangkar (Java). 9 m. 



Coarse sand. 2 females. 

 Stat. 47. March 8 — 12. Bay of Bima, near south fort. 55 m. Mud with patches of fine coral 



sand. 1 female. 

 Stat. 311. Febr. 12 — 13. Sapeh bay, east coast of Sumbavva. Up to 36 m. Mud and sand. 



1 female. 



The Copenhagen Museum possesses specimens from the following four localities, of which 

 two are within the "Siboga" area. 



Surabaya, Java. Capt. AndkÉa. 1870. 2 males. 



Cheribon, Java. Capt. AnüRÉa. 1870. 8 males, 5 females. 



Malakka. Cand. pharm. MARIUS Jensen. Very large number of specimens. 



Koh Kahdat, in the Gulf of Siam. Dr. Th. MoRTENSEN 25/I 1900. Large number of specimens. 



M a 1 e. — Eyes a little larger than in the other species, their transverse diameter being 

 conspicuously more than half as long as the distal joint of the stalk with eye. Antennulae (fig. 2 a) 

 with the two distal joints of the peduncle a little longer and thicker than in the female (fig. 26), 

 taken together not much longer than the outer margin of first joint; third joint scarcely or at 



