THE GEAPSOID CKABS OF AMERICA. 



135 



times as long as wide, tapering at both ends, marginate above, very 

 hairy below; fourth leg overreaching by half its dactylus the nicrus 

 of the third leg. 



Measurements. Female holctype, length of carapace 4, width of 

 same 10.5 mm. 



Specimen examined. Beaufort, North Carolina; Union College 

 collection (70c) ; 1 female ovig., holotype (42817). 



PINNIXA PATAGONIENSIS, new species. 

 Plate 30, figs. 1-3. 



Type-locality. San Matias Bay, Patagonia; steamer Hassler; 

 holotype male, Cat. No. 5741, M.C.Z. 



Diagnosis. Thumb reduced to spiniform angle of propodus; dac- 

 tylus strongly curved to meet thumb. Sharp ridge across posterior 

 part of carapace and across front. 



Description. Carapace narrowed to an acute angle at either side. 

 A sharp, smooth crest entirely across hinder part of carapace at car- 

 diac region; from 

 it the carapace de- 

 scends almost ver- 

 tically to posterior 

 margin and ob- 

 liquely forward to 

 gastro-cardiac fur- 

 row. A similar 

 crest marks the an- 

 tero-lateral margin 

 of the dorsal sur- 

 face, extending to 

 outer angle of or- 

 bit whence a short a 

 crest continues ob- 

 liquely downward 

 on the suborbital region; a transverse crest across the front is in- 

 terrupted by the median furrow. This crest is connected with the 

 antero-lateral crest by the upper part of the smooth orbital rim. 

 Surface coarsely punctate, pubescent near outer angles. Front promi- 

 nent, truncate, emarginate at middle. Oibit much larger than eye, 

 externally angled. Antenna as long as width of front and one orbit. 



Chela large; palm as high as superior length, upper and lower 

 margins very convex, upper margin sharp-edged; thumb a short, 

 much deflexed spine with obliquely truncate and bidenticulate tip; 

 the truncate, distal end of manus with a broad, oblong tooth above 

 digital spine; dactylus nearly straight and inclined obliquely down- 



Fio. 79. PINNIXA PATAGONIENSIS, MALE HOLOTYPE. 



MAXILLJPED, X 18g ; 6, ABDOMEN, X 7J. 



