S. I. Smith on Brazilian Crustacea. 13 



genus, in having- tlio front as seen from above nearly straight instead 

 of deeply hilobed, in the much greater breadth of the earapax between 

 the outer orbital teeth — the ratio of this breadth to the breadth of the 

 earapax between the lateral teeth being in C. an'julatus, J : '. -68, — 

 and in the ciliated posterior legs, 



Uca cordata. 



Cancer cordatus Linne, Amoeuitatcs Academicoe, tome vi, p. 414, 1763 ; Systema 

 Naturn?, eclitio xii, tome i, p. 1039; Herbst, o]). cit, Band i, p. 131, Tab. 6, fig. 38. 



Cancer uca Linne?, Systema ]!Taturie, edilio xii, tome i, p. 1041. 



Uca kevisf Dana?, United States Exploring Expedition, Crust, p. 375. 



(Nbn Uca una G-uerin, Iconographie du Regne animal, Crust., pi. 5, fig. 3, nee Ed- 

 wards, Histoiro naturelle des Crust., tome ii, p. 22, et Regne animal de CuWer, 

 Sme ^dit., pi. 19, fig. 1.) 



A single specimen of this species was obtained by Prof. Hartt at 

 Bahia. There are also specimens from Pai'a in the collection of the 

 Peabody Academy. All the specimens examined were males. 



The earapax is entirely naked and perfectly smooth above, very 

 broad, the greatest breadth being much anterior to the middle, and 

 very convex in an antero-posterior direction. The cervical suture 

 is very distinctly indicated, especially in the middle of the earapax, 

 where there is a broad depression on each side at the antero-lateral 

 angle of the cardiac region. The gastric region is broad and flattened 

 in the middle, the antero-lateral lobes are only indistinctly separated 

 from the median, and the posterior portion is rounded and slightly 

 protuberant but is still lower than the branchial region. The cardiac 

 region is very large, scarcely divided, and the posterior portion ex- 

 tends far back between the bases of the posterior pair of le'>s. The 

 branchial regions are swollen, evenly rounded above and wholly nn- 

 divided, and the lateral margins are very convex in the anterior por- 

 tion and are indicated by a very slight denticulated ridge. The whole 

 front is bordered by a sharply raised margin ; the median lobe pro- 

 jects almost perpendicularly downward between the orbits, and its 

 margin is regularly curved. The orbits are very lai-ge, and the mar- 

 gin is broken by a broad and deep hiatus on the lower side at the 

 outer extremity, just over which the outer angle of the superior mar- 

 gin projects as a rounded lobe ; the inferior margin is nearly straight 

 and is formed of two nearly parallel ridges, the inferior of which is 

 armed with a line of small tubercles, and the superior is irreo-ularly 

 granulous. The inferior obital regions are perfectly smooth and sep- 

 arated from the buccal area by deep sulci. The inferior lateral re- 

 gions are swollen and nearly smooth, there being only a few small 



