90 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Measurements. Female (23435), length of carapace 10.2, width 

 of same 12.7 mm. Male (23435), length of carapace 7.6, width of 

 same 8.4 mm. 



Habitat. Often found in pairs in stomach of Turbo pica (Des- 

 bonne). 



Range. St. Thomas; Guadeloupe. 



Material examined. St. Thomas, West Indies; Krebs, collector; 

 received from Copenhagen Mus. ; 1 male, 1 female (23435). 



PINNOTHERES STROMBI Rathbnn. 



Plate 20, figs. 1 and 2. 



Pinnotheres strombi RATHBUN, Proc. Acad. Nat. Sci. Philadelphia, 1905, 

 p. 371, 2 text-figs, (type-locality, Cleanvater Harbor, Florida, in 

 Strombus puyilis; type in Mus. Phila. Acad. Sci.). 



Diagnosis. Carapace of female very wide, sides truncate. Eyes 

 visible from above. Dactyli of legs falcate. Last leg much narrower 

 than first three. 



Description of female. Carapace nearly one and a half times as 

 broad as long, oblong, sides parallel, corners rounded; dorsal surface 

 curving down toward margins, smooth and naked; integument very 

 thin and easily wrinkled. Front less than one-fourth width of cara- 



pace, strongly deflexed, forming an obtuse 

 angle at middle. Orbits suborbicular, eyes 

 partly visible in dorsal view. 



Outer maxillipeds with carpal and pro- 

 podal joints short and stout, last joint 



. 



MAXILLIPED OF re- Chelipeds small, rounded ; upper margin 



MC H EN ~ of P ro P <H convex, lower margin sinuous, 

 fingers slightly deflexed, stout, fitting close 

 together, tips sharp and crossing. 



Second pair of legs a little the longest, first pair stoutest, fourth 

 pair much shorter and narrower than the others; dactyli short, fal- 

 cate, with slender horny tips. Edge of front, anterior (or upper) 

 margin of first three legs, and lower margin of carpus of first leg 

 fringed with short dense pubescence, as are also the lower surface 

 of carapace and edge of maxillipeds and abdomen. 



Measurements. -'Female holotype, length of carapace 6.6, width of 

 same 9.6 mm. 



Habitat. Commensal in Strombus pugilis Linnaeus. 



Material examined. Clearwater Harbor, west coast of Florida; in 

 living Strombus pugilis; 1905; H. S. Colton, collector; 1 female 

 holotype (1629, Mus. Acad. Nat. Sci. Phila.). 



