184 PROCEEDINGS OF THE ACADEMY OF [1880. 



§ II. Eyes without an ocular spine. 



9. 0, arenaria Sny. 



Cancer arenarius Catesby, History of the Carolinas, ii, PI. 35 (1731 

 and 1771*). Cancer quadratus Fabr., Ent. Syst., ii, p. 439 (1793). 

 Ocypoda quadraia Fab., Suppl., p. 847 (1798); Bosc. Edit., 1, "i, p. 

 194;" (teste Auct.) Edit., II, i, p. 247 (1828); Latr., Hist. Crust, et ' 

 Ins., vi, p. 49 (1803-4). Ocypoda arenaria Say, Jour. Acad. Nat. 

 Sci., Phila., i, p. 69 (1817); Edw., Hist. Nat. Crust., ii, p. 44, PI. 

 XIX, f. 13-14 (1837); DeKay, N. Y. Fauna, Crust., p. 13 (1841); 

 Gibbes, Proc. Am. Assoc, iii, p. 180 (1851); Gerstilcker, Arch, fiir 

 Naturg., xxii, p. 36 (1856 ; Guerin in La Sagra's Hist. Cuba, Crust., 

 p. 7 (1857); Martens, Arch, fiir Naturges., xxxviii, p. 103 (1872); 

 Smith. U. S. Fish Coram. Report for 1871-72, p. 545 (1875); Kings- 

 ley, Proc. Phila. Acad., 1878, p. 322. Ocypoda albicans Latr., Encyc. 

 Meth., X, PI. 285, f. 1 (after Catesby vix 0. albicans Bosc). Ocy- 

 poda rhombea Edw., Hist. Nat. Crust., ii, p. 46 (1837); Ann. Sci, 

 Nat., Ill, xviii, p. 143 (1852); Gibbes, 1. c, p. 180 (1851); Dana, 

 U.S. Ex. Exp.Crust.,p.322,Pl.XIX,f.8(1852);Heller,ReiseNovara, 

 Crust., p. 42 (1867); Smith, Trans. Conn. Acad., ii, p. 135 (1870); 

 Streets, Proc. Phila. Acad., 1873, p. 240. Monolepis inermis Say, 

 1. c, p. ^57 (Megalops). 



Carapax convex, gi'anulate above, front but little deflexed ; 

 lateral angles of carapax acute, extending as far forward as the 

 middle of the front. Lateral margin crenulate, arcuate, the 

 carapax being widest at the anterior third. Orbits below with 

 spiniform tubercles and occasionally a distinct emargination. 

 Eyes with the extremities rounded and not reaching to the 

 extremity of the orbit. Chelipeds with spines and tubercles ; the 

 meros with the upper and lower margins spined, the posterior 

 rounded and crossed by tubercular rugaj. Carpus with the 

 tubercles obsolete above but pronounced near the margins, the 

 inner margin armed with one or more strong spiniform teeth. 

 Hands tuberculate, the upper margin spined, the lower serrate. 

 A tubercular stridulating ridge on the inside near the fingers. 

 Fingers strongly inflexed. Ambulatory feet compressed, hairy, 

 their sides smooth, the upper portion margined and crossed by 

 transverse rugse. 



o 



* There were at least two editions of Catesby published, bearing dates 

 respectively as above and as the second is post-Linnean, the names employed 

 by him must hold. I think that another edition exists in the librai-y of 

 the Essex Institute at Salem, Mass., the date of which is between those 

 quoted above, but I have nothing at hand by which to decide the matter. 



