144 SMITHSONIAN MISCELLANEOUS COLLECTIONS 



with a transverse ridge near the posterior extremity, smoothly 

 rouncled, and but httle elevated, traversing the whole breadth of the 

 carapax. Surface smooth and glossy. Front not deflexed. Cheli- 

 peds hairy ; hand small, slender, tapering toward the straight, slender 

 fingers, which are not gaping and not at all deflexed. Ambulatory 

 feet of the second pair scarcely larger than the first pair ; the meros- 

 joint hairy, remaining joints toward extremities smooth and naked. 

 The feet of the penultimate pair are very large and thick, smooth ; 

 meros four-fifths as broad as long, its superior edge somewhat acute, 

 indistinctly granulated toward the base, its infero-posterior surface 

 minutely granulated. Last pair of feet small, ciliated. The surface 

 of the sides of the carapax or antero-inferior regions and around the 

 bases of the feet is hairy. There is a transverse, ciliated line across 

 the abdomen at its second joint, extending between the bases of the 

 penultimate pair of feet. In life the carapax is dark gray, mottled 

 with black. Its dimensions are: Length, 0.132; breadth, 0.28 inch. 



Found among dead shells on a muddy bottom in ten fathoms, in 

 the harbor of Hongkong, China. 



HYMEXOSOMID.E 



Genus HY^IEXOSOAL\ Leach 



239. HYMENOSOMA ORBICULARE Leach 



Hyincuosoina orhiciilarc LEach. Desm.xrEST, Consid. sur les Crust., p. 163,. 

 pi. XXVI. fig. I. Milne Edwards, Hist. Nat. des Crust., 11, p. 36, pi. 

 MV bis, fig. 13; Illust. Cuv. R. A., pi. xxxv. fig. i; ]\Iel. Carcin., p. 188. 



The published figures of this species must in many respects be 

 imperfect, as they show great discrepancies. 



Found at the Cape of Good Hope, in False Bay, on sandy bot- 

 toms, in ten fathoms. 



240. HYMENOSOMA GEOMETRICUM Stimpson 



Hymenosoma gcomctricnm Stimpson, Proc. Acad. Nat. Sci. Pliila., x, 

 p. 108 [54], 1858. 



The only specimen before us is a male, in which the breadth, 

 measured at the bases of the first pair of ambulatory feet, is exactly 

 equal to the length of the carapax. The body is much flattened 

 above and below. The carapax is indurated, and everywhere uni- 

 formly granulated above. Dorsal area broadly ovate, encircled by 

 an elevated, granulated ridge, and divided into ten areolets bv nar- 



