152 /S. I. Smith on American Crustacea. 



of which the ones toward the base are very prominent. The lateral 

 lolies are obtusely rounded, their outer margins are unarmed and the 

 inner margins are armed somewhat as the median lobe, but the tuber- 

 cles at the bases are slightly separated from the lobes, and stand par- 

 tially between the lateral and median. There is a process pro- 

 jecting from the upper side of the expiratory canal, as in the last spe- 

 cies. 



The external maxillipeds, the chelipeds, and the ambulatory legs 

 are very much as in E. Cubensis. 



The abdomen is very broad, nearly covering the whole sternum, 

 the greatest breadth being at the fifth segment, and the fourth and 

 sixth but little narrower. 



The two specimens from which this description was taken are in 

 the collection of the Boston Society of Natural History, and without 

 labels to indicate from whence they came, but they are probably from 

 the Bahamas. 



Although closely allied to JEJ. Cubensis, it is readily distinguished 

 from the only specimen of that species which I have seen, in wanting 

 wholly any granulations or tubercles along the lateral margins of the 

 carapax, either above or below, by the more tuberculose superior fron- 

 tal crest, in having tubercles at the outer angles of the orbits and a 

 marked hiatus beneath it in the inferior margin, by the much longer 

 teeth of antero-lateral margin, and by the quite difierent labial bor- 

 der of the epistome. 



Family, Tkichodactylid^e. 

 Dilocarcinus Edwards. 



Dilocarcinus pictns Edwards. 



Annales des Sciences naturelles, S^e serie, Zoologie, tome xx, 1853, p. 216; Archives 

 du Museum d'Histoii'e naturelle, Paris, tome vii, p. 181, pi. 14, fig. 2, 1854. 



There are specimens in the collection of the Peabody Academy of 

 Science and of the Museum of Yale College, from the River Amazon, 

 at Nauta, Peru, which I refer to this species, although they do not 

 agree perfectly with Edwards' figures and description. The speci- 

 mens from Nauta are alcoholic and both females, and are considera- 

 bly larger than the figure given by Edwards, one of them giving the 

 following measurements: — Length of carapax, 29'0'"'"; breadth of 



