CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION IQ 



anteriorly ; length and breadth equal ; margins dentated with teeth of 

 moderate size. Gastric region broad and convex. Upper surface 

 with about thirty small, nearly equidistant prominent warts ; the 

 interspaces granulated. Rostrum formed of two small, sharp, trian- 

 gular, diverging horns, outside of which, on either side, project three 

 slender spines belonging to the anterior margin of the basal joint of 

 the antennae. Eyes large. Superior margin of orbit with two deep 

 fissures and three teeth, the middle one of which is short, truncate, 

 with a trifid clove-like apex. The tooth at the external angle of the 

 orbit is rather long and sharp, curving forward ; immediately behind 

 this there are two teeth on the antero-lateral margin just in front of 

 the hepatic constriction. Behind this constriction on the lateral 

 margin of the carapax there are six teeth, the posterior ones very 

 small, and placed rather above than on the margin. At the posterior 

 extremity of the shell there are two small blunt submarginal teeth. 

 Outer pterygostomian regions with granulated surface, upon which 

 arise a few tubercles. Hectognathopoda and the adjoining trian- 

 gular surface smooth and ungranulated. Fossae of the inner an- 

 tennae excavated in the inferior side of the horns of the rostrum. 

 Chelopoda small, slender, smooth, and glossy. Ambulatory feet 

 hairy above; three of the joints spinulose; below smooth. Those of 

 the posterior pair nearly smooth above. 



The color in the preserved specimen is white, tinged with reddish-- 

 brown. Dimensions : Length of carapax, 0.8 ; greatest breadth, the 

 same ; breadth between tips of the larger spines of the antennas, 0.4 ; 

 between tips of the spines at outer angle of orbit, 0.57 inch. 



It was taken at Selio Island, Caspar Straits, by ^Ir. L. ]M. Squires, 

 of the steamer "John Hancock." 



Genus CAMPOSCIA Latrcille 



17. CAMPOSCIA RETUSA Latreille 



Camposcia rctusa L.vtreiij.E, Regne Anim., 2d ed., iv, 60. GuERix, Icon., 

 pi. i.\. fig. r. Milne Edw.vrds, Hist. Nat. des Crust., i, 283, pi. xv, figs. 

 15, 16; Guv. R. Anim. Crust., pi. xxxii, fig. i. Ad.ams and White, 

 Voy. Samarang, Crust., p. 6. 



The specimen is a fully developed female. It is covered with a 

 thick growth of tdvcc, indicating the sluggish habits of the species. 

 The abdomen does not appear to have been described ; it is seven- 

 articulate, depressed, suborbicular. but longer than broad, with a 

 transverse convexity at the middle of each joint, forming a low 

 median ridge, less conspicuous on the first and last joints. Tiie 

 terminal knobs of the rostrum are onlv the extremities of two slifrht. 



