Figure 196. — Pinnixa rctinens Rathbun. A, female in dor- 

 sal view, legs of left side not shown, 5 mm. indicated ; 

 B, male abdomen ; C, male third walking leg, lower 

 side ; D, male left chela ; B-D, holotype approximately 

 X 9 (after Rathbun, 1918b). 



Abdomen constricted at base of second segment, 

 widest between second and third, and tapering to 

 base of telson; telson wider than long; anterior 

 and posterior margins of sternal segments granu- 

 late. 



Measurements. — Carapace : male, length, 4 mm., 

 width, 7 mm.; ovigerous female, length, 6 mm., 

 width, 12 mm. 



Habitat. — An ovigerous female was taken from 

 the burrow of Upogebia affinis at Alligator Har- 

 bor, Fla., in June (Wass, 1955). Small specimens 

 have recently been taken from mud bottom in 

 Chesapeake Bay (Wass, personal communica- 

 tion). Near low-tide mark to 20 fathoms. 



Type locality. — Chesapeake Bay, off Poplar 

 Island, Md., 20 fathoms, soft bottom. 



Known range. — Chesapeake Bay; Alligator 

 Harbor, Fla.; Aransas area of Texas coast (U.S. 

 National Museum records). 



Remarks. — Though this species has never been 

 reported in the Carolinas, its occurrence in the 

 above localities would indicate that it probably 

 ranges at least between them. 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 

 763-049 O— 65 15 



Pinnixa cylindrica (Say) 



FMgure 197 



Pinnotheres cylindricum Say, 1818, p. 452. 



Pinnixa cylindrica: Rathbun, 1918b, p. 159, text-fig. 99, pi. 35, 

 figs. 5, 8 (rev.).— Hay and Shore, 1918, p. 44)6, pi. 36, fig. 2. 



Recognition characters. — Carapace smooth, 

 polished, punctate, punctations small and scarce 

 in middle third, large and more numerous else- 

 where; pubescent at extreme outer corners; de- 

 pressed in middle; anterior cardiac region sepa- 

 rated from gastric and branchial regions by a 

 groove. Anterolateral portions with a sharp 

 granulate crest not reaching cervical suture ; mid- 

 dle of cardiac region crossed by a transverse 

 (sometimes inconspicuous) ridge; posterior bor- 

 der short, somewhat concave. Front not promi- 

 nent, bilobed, with submarginal groove. 



Chelipeds moderately stout, smooth, punctate; 

 hands suboval, approximately 1.5 times as long as 

 wide; fingers horizontal, subequal in length, tips 

 strongly hooked, overlapping when closed, leav- 

 ing a gape; immovable finger with tooth near tip; 

 dactyl with a tooth near middle; a finely milled 

 crest running from tip of immovable finger back- 

 ward and upward approximately two-fifths length 

 of palm on outer surface. First walking leg slen- 

 der, reaching to propodus of second; second 

 stouter, reaching to middle of dactyl of third; 

 third leg stoutest, merus 1.6 times as long as wide, 

 distally narrowed, upper and lower margins finely 

 granulate; fourth short; dactyls nearly straight, 

 that of fourth leg convex posteriorly, slightly con- 

 cave anteriorly. 



Abdomen of male with sixth segment con- 

 stricted laterally, constriction narrower than tel- 

 son. 



Measurements. — Carapace : male, length, 7 mm., 

 width, 14 mm. ; female, length, 10 mm., width, 20 

 mm. (McDermott, 1962). 



Figure 197. — Pinnixa cylindrica (Say). Female in dorsal 

 view, legs of left side not shown, 5 mm. indicated. 



213 



