78 Bulletin, VanderMlt Marine Museum, Vol. II 



The eyestallcs are short, constricted below the cornea, which is large, 

 spherical, blackish brown. 



Synonymy. — Collodes granosus Stimpson, Ann. Lye. Nat. Hist. N. Y., 

 vol. 7, p. 194, pi. 2, fig. 4, 1860 (1862).— A. Milne Edwards, 

 Crust. Reg. Mex., p. 177, 1878.— Rathbun, Proc. U. S. Nat. Mus., 

 vol. 21, p. 569, 1898 ; Bull. 29, U. S. Nat. Mus., p. 106, fig. 3, pi. 36, 

 figs. 1 and 2, pi. 217, fig. 1, 1925 (females only). 



Genus : DASYGIUS Rathbun. 

 Dasygius depressus Bell. 



Plate 22. 



Diagnostic characters: Carapace very flattish, dorsal surface 

 coarsely granulated and produced posteriorly into a very sharp 

 median, horizontal tooth on the first abdominal segment. 



Type: Bell's type was a female taken in the Galapagos Islands, in 

 6 fms., sandy bottom and deposited in Mr. Bell's private collection, 

 location of which since his death is unknown to the present writer. 



Distribution : Galapagos Islands, Perlas Islands and Gulf of Cali- 

 fornia. 



Material examined : One female, taken inshore, Wafer Bay, Coeos 

 Island, March 5, 1926. 



Color : Old ivory with a pinkish tinge. 



Technical description: Carapace flattish, regions definitely de- 

 lineated ; upper surface covered with pearly granulations and an occa- 

 sional larger one. The rostrum is a single, short, triangulate tooth, 

 the tip blunt, uptilted, the upper surface with the edges thickened, 

 granulose, the center depressed. The external angle of the basal an- 

 tennal segment forms a tooth similar and subequal to the rostral tooth 

 and almost as prominent dorsally. The superior orbital margin is 

 elevated granulose above the eye, with the outer half flatter, the post- 

 orbital tooth blunt. There is a definite groove passing back from the 

 rostrum, circumscribing the gastric region, uniting laterally with the 

 cervical groove which separates the hepatic and branchial regions; 

 there is a deep pit on either side at the urogastric line and a well- 

 defined groove running back to the posterior margin, separating the 

 cardio-intestinal regions from the branchial lobe, which latter has a 



