134 BULLETIN W, UNITED dTATES NATIONAL MUSEUM. 



segments fused, last segment subtriangular, widest, and laterally 

 angled not far from sixth segment. 



Sexual variation. Female somewhat larger and more swollen than 

 male, frontal region more inclined, posterior margin wider, and 

 wider than in female transv er sails ; fingers elongate and very slightly 

 gaping, less slender than in female transversalis. 



Measurements. Male holotype, length of carapace 5.6, width of 

 same 11 mm. Female (7639), length of carapace 6.1, width of same 

 13.3 mm. 



Range. Trinidad (off Venezuela) and Monos Island, off NW. 

 coast of Trinidad. 



Material examined. Trinidad; shore; Jan. 30-Feb. 2, 1884; 

 steamer Albatross; 1 males (1 is holotype), 7 females (2 ovig.) 

 (7639). Moncs Island, Trinidad; shore; Jan. 30-Feb. 2, 1884; 

 steamer Albatross; 1 male (23436). 



PINNIXA CRISTATA Rathbun. 



Plate 29, figs. 8 and 9. 



Pinnixa cristata RATHBUN, Amer. Nat., vol. 34, 1900, p. 589 (type-locality, 

 Beaufort, North Carolina; holotype female, Cat. No. 42817, U.S.N.M.). 



Diagnosis. Sharp crest across posterior part of carapace. Fingers 

 gaping, thumb short. Legs narrow; dactyls slightty curved except 

 last pair. 



Description of female. Carapace very short, narrowed at either 

 side; a high, sharp, transverse crest across carapace, ending above 

 bases of last legs; surface punctate, wrinkled, and microscopically 



granulate; deep furrow behind gastric 

 region ; antero-lateral margin a raised crest, 

 stopping short of hepatic region; posterior 

 margin wide, concave. Front deflexed, not 

 advanced ; orbit no wider than half of front. 

 Chelipeds rather stout; palm suboblong, 



no. T8.-p^-xixA CUISTATA, W1 " th u PP er and lower margins convex, sur- 



OUTEII MAXILLIPED OP KB- face covered with a reticulate pattern of 



MALE HOLOTVPE, > g^ grantl i at i ons . thumb short, subtriaiigu- 



lar, deflexed ; a subbasal tooth on prehensile edge, also a small tooth 



near the tip, forming a truncate extremity against which the tip of 



the gaping dactylus fits; inner margin of dactylus bent in a right 



angle at middle, subentire. 



Dactyli of legs slender, of fourth leg straight, of first, second, and 

 third slightly curved; first leg slender, reaching to end of propodus 

 of second ; second intermediate in width between first and third, reach- 

 ing one-third length of dactylus of third; merus of third leg 2 



