180 PROCEEDINGS OF THE ACADEMY OF [1880. 



Hist. Crust., ii, 48 (1837) ; Ann. Sci. Nat., Ill, xviii, 142 (1852) ; 

 Dana, U. S. Ex. Ex. Crust., p. 326, PI. XX, f. 3 (1853). 

 Ocypoda brevicornis var longicornuta Dana, 1. c, 337, PI. XX, 

 f. 4 (1853). Ocypoda agyptica Gerstaecker, Archiv. fur Natur- 

 gescliichte, xxii, 134 (1856) ; Heller, Sitzungsbericbte Wien Akad., 

 xliii, p. 361 (1861) ; Hoffmann, Recli. Fauna Madagascar Crust., p. 

 14 (1874 teste Zool. Record) ; Miers, Ann. and Mag. Nat. Hist., V, 

 ii, 409 (1878). 



Carapax nearly square, granulate, front strongly deflexed, orbits 

 sinuate, oblique, the lateral angles being far behind the front. 

 These angles are nearly right angles. Orbits with an indistinct 

 fissure below. Eyes terminated with a st3de which in most cases is 

 long and cylindrical, extending far beyond the orbits. In the 

 young, however, it is small and in some cases even wanting ; that 

 form, when small and conical, characterizes the nominal species 

 brevico7mis ; maxillipeds granulate. Meros of larger cheliped, 

 with the margins armed with spiniform tubercles, more prominent 

 on the anterior margins. Carpus granulate, with internally one 

 or two teeth. Hand externally acute, tuberculate, serrate below, 

 the inner surface with scattered tubercles. Stridulating ridge at 

 some distance from the base of the fingers, straight and composed 

 of rounded tubercles. Ambulatory feet with acute granules, 

 which exhibit a tendency to arrange themseh'es in rugfe. 



]!fatal ! (E. Wilson) ; Mauritius ! (Guerin's Collection) ; Anjir, 

 Ternate, Amhoina, Adenare, Zanzibar, Benkula (Hilgendorf) ; 

 Sandwich, Is., Tahiti, Bonin, Loo Choo, Hong Kong Ouisma (Stm.); 

 Egypt, Mauritius, Bombay, Australia ( Edw. ) ; Ceylon and Nicobars 

 (Heller) ; Madagascar (Hoffmann) ; Tongatabu (Dana). 



A specimen collected by the Wilkes Expedition ('' East Indies ") 

 has the carapax intermediate between this species and cursor. 

 The ocular st^yles are wanting. Milne-Edwards' figure in the 

 Regne Animal is diff'erent from any specimens that I have seen. 

 I agree with Kossmann in considering segyptica as but a variety 

 of ceratophthalma. 



2. 0. platytarsis Edw. 



Ocypoda platytarsis Edw., Ann. Sci, Nat., Ill, xviii, p. 141 (1853) ; 

 Heller, Reise Novara Crust., p. 43 (1867;. 



Carapax wider than is usual in this genus and covered with 

 large granules. Superior margin of orbit sinuate, the external 

 angles rounded ; sides parallel about one-fourth of their length. 

 Orbits with an indistinct fissure below. Eyes spined as in ceratoph- 



