MB. E. J. MIERS'S REVISION OP THE HIPPIDEA. 323 



The single specimen in the Museum was purchased of H. 

 Cuming, Esq. 



HiPPA. 



Hippa, Fabr. {part.}. Mantissa Ins. i. p. 329 (1787); M.-Edw. Hist. 

 Nat. Crust, ii. p. 207 (1837); Stimpson, Proc. Ac. Nat. Sci. Phil. 

 p. 230 (1858). 



Antennules of moderate length. Antennse with a very long, 

 robust, multiarticulate, and strongly ciliated flagellum. Third 

 maxillipedes with the last joint narrow, laminate, and compressed. 

 First legs with the last joint lamellate-oval. 



The species of this genus, of which two inhabit the opposite 

 shores of the American continent, and one the Indian and Indo- 

 Malayan region, bear a very close resemblance to one another ; 

 but the distinctive characters, although slight, appear constant in 

 large series of specimens. 



HiPPA EMERITA. PI. V. fig. 9. 



? Cancer emeritus, Linn. Syst. Nat. (ed. 12) p. 1055 (1766). 



? Astacus emeritus, Fabr. Ent. Syst. ii. p. 484 (1793). 



Cancer testudinarius, Herbst, Naturg. Krabben, ii. p. 8, pi. xxii. fig. 3 



(1796). n ^\ \ 

 Hippa emeritus, Fabr. Ent. Syst. Suppl p. 370 (1798). 

 Hippa emerita, Latr.{1) Hist. Nat. Crust, vi. p. 176(1803); Lamarch{l), 

 Hist. Anim. sans Vert. v. p. 222 (1818) ; Desmarest, Consid. Crust. 

 p. 174, pi. xxix. fig. 2 (1825) ; M.-Edw. Hist. Nat. Crust, ii. p. 209 

 (1837) ; Crust, in Cuvier R. A. (ed. 3) pi. xlii. fig. 2; Gibbes, Proc. 

 Amer. Assoc, p. 188 (1850) ; Dana, U.S. Ewpl. Exp. xiii. Crust, i. 

 p. 409, pi. XXV. fig. 9 (1852) ; Guerin-Meneville, Icon. R. A. Crust. 

 pi. XV. fig. 2 ; in Ramon de la Sagra, Hist. Isla de Cuba, vii. Crust. 

 p. xxxiv. (1856); Heller, Crust, in Reise der Novara, p. 73 (1865). 

 Hippa talpoidea. Say, Journ. Ac. Nat. Sci. Phil. i. p. 160 (1817); De Kay, 

 Zool. New York Fauna, pt. vi. p. 18, pi. vii. fig. 17 (1844) ; Gibbes, 

 Proc. Amer. Assoc, p. 188 (1850); Smith, Trans. Conn, Ac. iii. 

 p. .311 (1877). 

 Body very convex. Median lobe of the front triangular, sub- 

 acute, and separated from the lateral lobes by a distance usually 

 greater than its own breadth at base ; the lateral frontal lobes are 

 narrow, acute, and much more prominent than the median lobe. 

 Carapace marked with irregular crenulated transverse lines, which 

 are nearly obliterated on the sides and towards the posterior 

 margin ; and with a distinctly marked postfrontal and postgastric 

 incised line. Eyes very long and slender. Antennules densely 



