THE SriDER CRABS OF AMERICA 



23 



two of these spines are near together close to the extremity 

 and give the rostrum the appearance of being trificl. Basal 

 antenna! article with a spine below midway of its length 

 and another at outer distal angle; a spinule at end of 

 next two articles. On sternum in front of male abdo- 

 men, two or three spines on each side forming converging 

 lines parallel to terminal segment of abdomen. 



Chelipeds twisted, those of 

 male stout; margins of lovv^er 

 (really inner) surface armed 

 with sharp spines; at distal 

 end of inner (or upper) sur- 

 face of merus, a long spine; a 

 sharp spine near each extrem- 

 ity of upper surface of carpus ; 

 hand broad, inflated; fingers 

 about as long as palm, pre- 

 hensile edges furnished with 

 truncate, denticulate, widely 

 separated teeth except at ex- 

 tremities where they become 

 closely fitting, triangular 

 teeth. Chelipeds of female 

 much feebler, palm shorter, 

 fingers much longer and more gaping, sharp spines on 

 prehensile edges. The merus of the legs has besides the 

 conspicuous armament at the extremity a single short 

 spine situated about midway of its length in the fourth 

 pair but successively more distad in the other pairs. 

 The dactyls are longer than the propodites, are fringed 

 with hair, their extremities are gently curved and drawn 

 out to a very slender tip. 



Color. — -A dirt}^ gr^^y (Hay and Shore) . 



Measurements. — Male (18071), length of carapace 19.5, 

 width 8.2, length of rostrum 11, length of cheliped about 

 21.5 mm. 



Range. — From off Cape Hatteras, North Carolina, to 

 Eio de Janeiro, Brazil. Georgia (Gibbes). Shallow 

 water to 49 fathoms. 



Material examined. — See table, pages 22-23. 

 Genus ANOMALOTHIR Miers 

 Anomalopus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 

 124; type, A. furcillalus Stimpson; name preoccupied by 

 Dumeril, Cat. Coll. Rept., 1851, p. 185, for a genus of Rep- 

 tiles. — A. Milne Edwards, Crust. R<5g. Mex., 1879, p. 187. 

 Anomalolhir Miers, Journ. Linn. Soc. London, vol. 14, 1879, 

 p. 648; substituted for Anomalopus. 



Fig. 5.— Metoporhaphis calcarata 

 (u385), maxilliped, x 14.5 



