1880.] NATURAL SCIENCES OP PHILADELPHIA. 185 



Young specimens (less than 10 mm. broad) have the lateral 

 angle further back than in the adult, while the spines of the 

 chelipeds are wanting or but faintly indicated. 



The 0. albicans of Bosc, Lamarck and Desmarest has the 

 eyes terminated by a style, a feature I have never observed in 

 an}- specimen of 0. arenaria. The locality given is South Caro- 

 lina. The 0. rhombea of Fabricius is not this species, as his 

 expression " Carpus ut7'inque unidentatis, manibus sublaevis " will 

 not apply to this form, but agrees better with 0. forcUmana. 

 Fabricius gives no locality- for his specimens. The Brazilian 

 forms {rhombea Auct.) show no differences from northern speci- 

 mens. I haA-e seen specimens from over thirt}- localities embraced 

 in the limits of Great Egg Harbor, N. J. (Say\s types), to Rio 

 Janeiro, Brazil, and also specimens from the west coast of Mexico 

 (Dr. W. H. Jones). 



10. 0. convexus Quoy and Gaimard. 



Ocypoda convexus Quoy et Gaimard, Yoy. Uranie, Zool., iii, p. 535, PI. 

 LXX\^II, f. 2 (1828); Edw., Hist. Crust., ii, p. 49 (1837j. 



Carapax granulate, sides arcuate, front deflexed, orbits sinuate, 

 lateral angles behind the base of the rostrum, acute. Meros 

 internall}' entire, distally tuberculate ; carpus tnberculate, its 

 inner surface with a bifid tubercle. Hands cordate, externally 

 granulate, serrate above and below. 



This brief description is taken from the figure of MM. Quo}' 

 and Gaimard. I have never seen the species. It is said to have 

 come from Australia. 



11. 0. cordimana Desm. 



? Ocypoda rhombea Fabr., Suppl. Eut. Syst., p. 348 (1798). Ocypoda 

 cordimana Desm,, Consid. sur les Crustaces, p. 121 (1825); Edw., 

 Hist. Nat. Crust., ii, p. 45 (1837); Ann. Sci. Nat. Ill, xviii, p. 143 

 (1852); Jacquinot et Lucas, Voy. Astrolabe et Zelee, p. 64; Heller, 

 Reise Novara Crust., p. 42 (1867); A. M. Edw., Nouv. Arch. Mus., 

 ix, p. 271 (1872). Ocypoda rhombea ? Desmarest, 1. c. p. 122; Ran- 

 dall, Jour. Phila. Acad., viii, p. 123. Ocypoda pallidula Jacquinot 

 et Lucas, 1. c, PI. VI f. 4. Ocypoda laevis Dana, U. S. Expl. Exped., 

 Crust., p. 325, PI. XX, f . 2 (1852). ? Ocypoda convexa Stm., Proc. 

 Phila. Acad., 1858, p. 100. 



Carapax arcuate, evenh' granulate. Front strongly deflexed. 

 Orbits sinuate above ; lateral angles acute, but not extending as 

 far forward as the base of the front. Sides in the adult slightly 

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