CALIFORNIA STALK-EYED CRUSTACEA. 157 



Subtribe THALASSINIDEA. 



Carapace short, comi^ressed, and marked with two longitudinal sutures. 

 Kostrum small or wanting. Both pairs of antennte elongated and furnished 

 with long peduucles, those of the outer pair five-jointed and usually devoid 

 of an aciele. First pereopods more or less chelate; second pair often 

 chelate; third pair always simple. Last segment of the thorax movable. 

 Abdomen long, the segments not overlapping, the side plates feebly de- 

 veloped. Tail-fin well developed. Branchiae variable. 



Family CALLIANASSID^. 



Carapace strongly compressed. Rostrum flattened. Eyes small. First 

 pair of chelipeds generally unequal; second, pair with or without chelae. 

 Side plates of the abdomen absent. Telson and uropods broad and devoid 

 of cross furrows. Burrowing crustaceans with soft, elongated bodies. 



Genus Upog^bia Leach. 



Eostrum short and tridentate. Eyes small, with cylindrical peduncles. 

 No antennal scale. External maxillipeds pediform. First thoracic legs 

 subequal and subchelate, the pollex small; the remaining pairs not chel- 

 ate. Abdomen long, with subquadrate joints; pleopods broad, the second 

 pair similar to the others; uropods broad and foliaceous; telson broad, 

 subquadrate, foliaceous. Podobranchiae and mastigobranchiae wanting. 



Type. — U. stellata (Montagu). 



Upogebia pugettensis (Dana). 



Gehia pugettensis Daxa, Proc. Acad. Nat. Sci. Phila., 1852, p. 19; Crust. 

 U. S. Expl. Expd., Part I, 1S52, p. 510, PI. XXXII, fig. 1. Stimpson, 

 Journ. Bost. Soc Nat. Hist., Vol. VI, 1857, p. 488, PI. XXI, fig. 2. 

 LocKiXGTON, Ann. Nat. Hist. (5), Vol. II, 1878, p. 299. 



Gehia californica Stimpson, Proc. Cal. Acad. Sci., Vol. I, 1856, p. 88. 



Upper portion of the carapace in front of the cervical groove flattened, 

 scabrous, and hairy, and marked with three longitudinal grooves, the 

 median groove being the shortest; front with the median tooth large, 

 horizontal, triangular, the lateral teeth short. A minute marginal tooth 

 or spine generally present a short distance below the lateral teeth. Antero- 

 lateral and postero-lateral angles rounded. Eye-stalks short, reaching very 

 little further forward than the lateral teeth of the front. Antennules less 



