66 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



The first legs have the merus wide, nearly subcircular, with numer- 

 ous broken, transverse setose rugae, the carpus is unevenly convex 

 on the upper surface, tapers distally and has a very acuminate spine ; 

 the propodus is short and has the lower distal angle produced into a 

 rounded, stout blade; the lower margin is distinctly carinate, and it 

 and the distal margin are armed with stout spines; the dactyl is a 

 stout, oval blade, with the anterior lateral margin heavily carinate 

 and the posterior lateral margin convex, the margins ciliate. 



The second and third legs are similar, subequal, with the merus en- 

 tirely concealed beneath the sidewall of the carapace; the carpus 

 squarish, angulated at the distal angle ; the propodus and dactyl fal- 

 cate ; the propodus excavate and produced distally to an acute blade, 

 reinforcing the dactyl, which is concave on its anterior margin and 

 convex on the posterior margin, forming a subcrescentic blade. 



The fourth pair of legs are smaller than the third and have the 

 dactyl with the lower lateral margin thickened, the upper lateral 

 margin similar to and convergent with the lower margin. 



The fifth legs are concealed beneath the carapace and are exceed- 

 ingly slender ; the ischium is nearly as long as the merus ; the carpus 

 similarly slender but shorter ; the propodus elongate, it and the dactyl 

 forming a claw, the fingers being much shorter than the palm and 

 fringed with many setae. 



Synonymy, — f Cancer emeritus Linne, Syst. Nat., ed. 12, p. 1055, 1766. 

 fAstacus emeritus Fabricius, Ent. Syst., vol. 2, p. 484, 1793. 

 Cancer testudinarius Herbst, Naturg. Krabben u. Krebse, vol. 2, p. 



8, pi. 22, fig. 3, 1796. 

 Hippa emeritus Fabricius, Ent. Syst. Suppl., p. 370, 1798. 

 Eippa emerita Latreille ( ?), Hist. Nat. Crust., vol. 6, p. 176, 1803. — 

 Lamarck (?), Hist. Anim. sans Vert., vol. 5, p. 22, 1818. — 

 Desmarest, Consid. Crust., p. 174, pi. 19, fig. 2, 1825. — H. Milne 

 Edwards, Hist. Nat. Crust., vol. 2, p. 209, 1837 ; Crust, in Cuvier 

 R. A., ed. 3, pi. 42, fig. 2. — Gibbes, Proc. Amer. Assoc. Adv. Sci., 

 p. 188, 1850.— Dana, U. S. Explor. Exped., vol. 13 ; Crust., vol. 

 1, p. 409, pi. 25, fig. 9, 1852. — Guerin-Meneville, Icon. R. A. 

 Crust., pi. 25, fig. 2; in Ramon de la Sagra, Hist, Isle de Cuba, 

 vol. 7, Crust., p. 34, 1856. — Heller, Crust, in Reise der Novara, 

 p. 73, 1865. 

 Hippa talpoida Say, Journ. Acad. Nat, Sci. Phila., vol. 1, p. 160, 

 1817.— DeKay, Zool. N. Y. Fauna, Crust., vol. 6, p. 18, pi. 7, fig. 17, 



