42 



Surabaya, Java. Capt. ANDREA 1870. 5 males, 9 females. 

 Cheribon, Java. Capt. ANDREA 1870. i male. 

 "Indo-Chinese Sea", Schmidt, i female. 



Male. — Eyes (fig. 4^) smaller than in A. vulgaris, their diameter being generally a 

 little less than half as long as the distal joint of the stalk with eye. Peduncles of the anten- 

 nulae nearly as in A. dispar\ third joint from a little less to more than two and a half times 

 as long as the inner margin of second joint. Thickened part of upper flagellum conspicuously 

 shorter than the inner margin of second joint. Lower flagellum (fig. \c) differs considerably from 

 those in all other species; it contains only 12 joints, as fourth and fifth joints are fused; its shaft 

 looks as if it consisted of only two moderately long joints, while the oblong and much more 

 slender third joint has the insertion of fourth joint on its upper side at the base, as the third 

 joint is produced considerably in advance of that insertion ; fourth joint, the first of the main 

 "branch", is almost vertical on the third, slender at the middle and with a triangular, very 

 conspicuous protuberance projecting backwards from its upper posterior angle. Second and third 

 joints of the main "branch" each with a long and strong spine below at the end, and a short, 

 robust spine on the outer side; fourth joint with 3 moderately long spines below, while the 5 

 remaining joints are more slender and without spines. From the protruding end of third joint 

 of the shaft two extremely long spines project, both nearly straight to somewhat from the end, 

 and the apical part is curved strongly upwards; the lower spine is somewhat longer and thicker 

 than the upper and reaches to the distal group of spines on the main "branch". — The 

 antennal squama reaches to or slightly beyond the end of second antennular joint. The coxae 

 of third pair of legs with a tooth from the distal inner angle (fig. 4^:); the trochanter without 

 tooth near the end. Genital coxae (fig. 4^) much broader than long, anteriorly broadly rounded. 

 Exopod of uropods (fig. 4^') a little less than five times as long as broad; on the outer margin 

 the ciliated part is obviously shorter than the glabrous portion, as it occupies from scarcely 

 less to a little more than two-fifths of the whole length. 



The petasma (fig. 4^) is very curious. Pars astringens is wanting. Pars externa (t'.) is 

 four times as long as broad, with the inner margin straight to near the end, the outer margin 

 subparallel with the inner to considerably beyond the middle, and then evenly curved to the 

 distal inner angle. Pars media is proportionately very slender excepting towards both ends ; its 

 proximal part is at the free end produced into an inner and an outer process, both very oblong, 

 curved respectively strongly inwards and outwards, with their ends obtuse; pi'ocessus ventralis 

 wanting; the distal half of pars media, the capitulum, has its proximal portion slender, and 

 then it is expanded on the outer side, so that this flattened portion is somewhat more than 

 half as long again as broad, with about 7 hooks along the convex outer margin (fig. 4//), while 

 the broad end is cut off transversely and armed with a big, triangular spine. 



Length 11. 5 — 16.5 mm. 



Female. — Very similar to the female of A. dispar as to the eyes, the antennulae, 

 and the co.xse of third legs. The antennal squama reaches the middle of third joint of the 

 antennulae. Trochanter of third legs without any tooth near the end. Exopod of uropods as in 

 the male, consequently differing from that in the female A. dispar. The genital area (fig. 4/) 



