Stat. 302. February 2. io°27'.9S., 123' 28.7 E. Near Rotti-island. 216 m. Sand and coral sand. 



I female. 

 Stat. 306. February 8. 8°27'S., 122° 54.5 E. Lobetobi-strait. 247 m. Sandy mud. 11 females. 

 Stat. 312. February 14. 8° 19' S., ii7°4rE. Saleh-bay, North coast of Sumbawa. 274 m. Fine, 



sandy mud. 1 male, 10 females. 



Length of the male 47 mm., of the female 72 mm. Closely resembling its only other 

 congener, Atyp. couiprcssipes (Hend.). Carapace, with the rostrum, measuring one-third the total 

 length ; carapace finely and closely punctate in the middle, very slightly pubescent. Rostrum 

 ascending, short, reaching in the female, which is larger than the male, just beyond the eyes, to 

 or almost to the end of i^' joint of antennular peduncle; in the single male that was collected, 

 the rostrum e.xtends barely to the end of the eye-peduncles. In addition to the epigastric tooth, 

 situated at the anterior third of the carapace, the rostrum bears 5 or 6 equidistant teeth, the 

 first two of which are always on the carapace; the teeth reach to the tip. In the largest female, 

 that from Stat. 302, which is 72 mm. long, the rostrum bears only 4 teeth, the second of which 

 is situated just above the orbital margin, and the lower margin, usually straight, appears in 

 this specimen slightly curved. In young females from .Stat. 306 the rostrum is nearly horizontal, 

 hardly ascending. In old specimens the carapace appears, just behind the epigastric tooth, 

 decidedly scabrous, caused by some minute spinules, but the rest of the carapace seems to be 

 smooth, like the abdomen. 



Xo post-rostral crest or carina, the carapace being rounded on its posterior half. Post- 

 ocular angle distinct, more or less acute. Post-antennular (antennal) spine small, with no buttress, 

 so that, quite as in Atyp. compressipes, a post-antennular groeve is wanting at all. No 

 hepatic spine. The .subhepatic ridge, defining the anterior part of the cervical groove, is 

 quite distinct and ends just near and behind the antero-inferior angle that is rounded, not 

 dentiform; the gastro-hepatic ridge, which is a little shorter than the other and not continuous 

 with it, is also well marked, but hardly reaches to the level of the antennal tooth. There seems 

 to be a short transverse suture across the branchiostegite at the level of the 3'"<^ legs. 



The three first abdominal terga are rounded, the 4* and the 5''' are distinctly carinate, 

 their anterior third part excepted, and the carina of the 6* somite ends in a small tooth; in 

 one or two adult females from Stat. 312 the 2'"^ and the 3'''' terga show a tracé of carination, 

 but these are exceptions. In the adult female from Stat. 302 the carapace, without the rostrum, 

 is 18 mm. long, the 6"^ somite 8 mm. long, almost half the length of the carapace, and 5,5 mm. 

 broad. The telson, 10,5 mm. long, appears a little longer than the 6"^ somite and fully agrees, 

 like also the uropods, with that of Atyp. coniprcssipes. Eyes in proportion to the peduncle 

 smaller than in the other Atypopetiaeus, pigment as much developed. 



The upper antennae also resemble those of the type species. Antennular peduncle little 

 more than two-thirds the length of the carapace, without the rostrum, but in the largest 

 specimen from Stat. 302 it is a little shorter than two-thirds that length. Flagella subequal. 

 In the male, long 47 mm., the upper (longer) flagellum (21 mm.) is one and a half as long 

 as the carapace, rostrum included, (13,5 mm.), the basal thickened part measures one-eighth 

 that length ; the lower tiagellum, little shorter, appears distinctly serrated on the upper margin 



S5 



