DECAPOD CRUSTACEANS OF THE BEAUFORT, N. C, REGION. 445 



The outer maxillipeds are characteristic of the genus. Chelipeds stout ; carpus squarish in dorsal 

 view, its outer distal angle prominent; palm inflated, margips convex, lower margin hairy, width 

 greater at distal than proximal end, the upper distal angle higher than base of dactylus; dactylus about 

 as long as upper edge of palm ; both fingers much curved ; when closed the tips cross and there is no gape, 

 the thin and irregularly denticulate edges fitting together. 



Legs fringed with long hair, especially on the propodites, where there is a border of hair on the lower 

 margin, and in the second and third legs a row of still longer hair attached near the upper margin on 

 the posterior surface, the length of the hairs being twice as great as the width of the propodite. Tlie 

 legs diminish in stoutness from the first to the fourth. The first leg is a little longer than the second, 

 the third about as long as the first. Propodites stout, upper margins convex. Dactylus of first three 

 legs long, curved, the slender homy tips about 

 half the entire length ; dactylus of foiulh leg sim- 

 ilar in shape, but very much smaller. 



Abdomen of male suboblong, distally taper- ^ SAVfti M»»- (^ " — «i-^M«#\ 



ing, at base not more than half the width of the vJWf^l^X v ,' ^~" ~ ^/''^ 



sternum; sutures faint except the one marking 

 the subtriangular terminal segment. 



Lengthof carapaceof male, holotype, I mm.; \V/>^ fljt. ^1111 ^ . .^ jur ^^jm^ -ja 



width of same, 1.3 mm. 



The almost minute specimen upon which 

 this species was established and which , up to the 

 present time, is unique, was detected by Dr. 

 Mary J. Rathbun among some material sent to ^o..o.-Pa,apinni.a beauM^nsis. ventral view. Type. 



the United States National Museum from the 



fishing grounds, 20 miles off Beaufort Inlet. From its small size, relatively large eyes, the long 

 hairs on the legs, and the thin prehensile edges of the lingers. Dr. Rathbun surmises that the specimen 

 may possibly represent a postlarval stage of some crab, the adult of which is as yet tmknown. 



We are indebted to Dr. Rathbun for permission to copy her description and figiire of this specimen. 

 Owing to its small size and the lateness of its discovery it has not been possible to secure a satisfactory 

 photograph for the plates whi(^ illustrate this paper. 



Genus PINNIXA White. 



Pinnixa White, 1846, p. 177. 



KEY TO THE SPECIES OP THE BEAUFORT REGION. 



a. Chela with the thxunb much shorter than the movable finger and bent downward. 

 6. Posterior part of carapace with a short transverse ridge more or less interrupted in the middle. 



c. Penultimate article of third pair of walking legs about as broad as long chxtopterana. 



cc. Penultimate article of third pair of walking legs distinctly longer than broad sayana. 



bb . Posterior part of carapace with a conspicuous transverse ridge extending uninterruptedly from side 



to side cristata. 



aa. Chela with the thumb about as long as the movable finger and not bent downward cylindrica. 



Pinnixa cheetopterana Stimpson. PI. xxxvi, fig. 4. 



Pinnixa chtEtopterana Stimpson, i860, p. 235; Sumner, rgii, p. 674. 

 Pinnixa cylindrica Stimpson, 1859, p. 68. 



Carapace transversely oval, a little more than twice as wide as long; surface uneven, sides densely 

 pubescent, and the regions well defined by pubescent sulci; cardiac region with an acute transverse 

 crest broadly interrupted in the middle so as to form two dentiform prominences, more conspicuous 

 in the male than in the female; front narrow and with a deep median groove. 



Chelipeds stout, pubescent; hand, in the male, with the palmar edge perpendicular, the immovable 

 finger very short, deflected, and with a tooth on its cutting edge, the movable finger strongly curved, 

 69571°— 18 29 



