THE GRAPSOID CBABS OF AMEBICA. 95 



deflexed, subcylindrical with tips turned inward almost at a right 

 angle, a small gape at base formed by a sinus in each finger. 



Legs very slender, of similar length, dactyli of first three legs with 

 a straight base and long curved tip, of last leg with a long straight 

 part and short curved tip ; propodi with a thin fringe of hairs below 

 and a fringe of hairs lying on the posterior surface which are at- 

 tached near upper margin. 



Abdomen longer than wide. 



Measurements. Female holotype, length of carapace 9, width of 

 same 8.4 mm. 



Habitat. Commensal in black ascidian. 



Range. West coast of Florida ; Jamaica. 



Material examined. 



Off St. Martins Reef, West Florida; lat. 28 43' N.; long. 82 56' 

 W. ; 17 feet; rocky bottom covered with grass and thin layers of 

 sand and mud ; 1887 ; Lieut. J. F. Moser, U. S. Navy ; 1 female ovig. 

 (13056). "Very many sea squirts in the dredge." 



Near Kingston, Jamaica; 1891; T. H. Morgan; 1 female (17238). 



Port Royal, Jamaica; in black ascidian; 1893; R. P. Bigelow; 2 

 females ovig., 1 is holotype (23440). 



PINNOTHERES SHOEMAKERI, new species. 



Plate 22, figs. 1-4. 



Type-locality. St. Thomas; summer, 1915; Clarence R. Shoe- 

 maker, for whom the species is named; male holotype (49216). 



Diagnosis. Male and female, a deep median groove on front ; 

 legs similar, diminishing from 1 to 4; dactyli slender, curved. Male 

 only, carapace very uneven ; manus very swollen, strongly ridged. 



Description of male. Small species, pubescent all over; carapace 

 subhexagonal, widest at middle; postero-lateral portion of branchial 

 region forming a steeply inclined facet with smooth concave surface; 

 dorsal surface cut by deep furrows into high regularly placed eleva- 

 tions; one furrow surrounds the circular cardiac region; one runs 

 transversely across middle of carapace ; another, transverse, on either 

 side of median gastric areole; still another behind the front. Lateral 

 angles broadly rounded and with antero-lateral margins bordered by 

 a raised rim. Front thick, subtruncate, a minute median emargina- 

 tion, continued backward by an impressed line. Eyes spherical, pro- 

 jecting well out of orbits. 



Palpus of outer maxilliped very small, compared to merus-ischium ; 

 shape akin to that of P. moseri; but the inner margin bears a very 

 short and broad rudiment of a dactylus. 



