Notes on North American Crustacea. 49 



XL — Notes on North American Crustacea, No. 1. 



By "William Stimpson, Corresponding Member. 

 Read February 28th, 1859. 



[The materials used in the preparation of the following paper have been chiefly 

 supplied from the Museum of the Smithsonian Institution. A large number of 

 interesting species were contributed by Mr. Theo. Gill, who collected them in 

 the "West Indies, under the auspices of Mr. D. J. Steward.] 



MAIOIDEA. 

 Ijoxorynchtis ^randis. 



Loxorynchus grandis, Stirapson ; Crust, and Ecliin. Pacific Coast of 

 N. Am., p. 12 ; pi. xix. f. 1, and xxii. f. 1. 



This is one of the largest crabs known, as it appears from a 

 specimen collected by Dr. Kennerly at San Diego, California, 

 where it is called " Sheep-Crab," from the woolly pubescence 

 with which it is covered. Tlie carapax in this specimen mea- 

 sures 7'34 inches in length and 5*85 in breadth. 



Otliomla actileata. 



Hyas aculeata, Gibbes ; Proc. Am. Assoc, 1850, p. lYl. 

 This species is not uncommon on the Florida Coast. 



£pialtiis affinis, nov. sp. 



Epialtus hitubercidatus, Gibbes; loc. cit. 173. (nonM.-Edw.) 

 This species differs from E. hitulerculatus in its greater 



MAECH, 1859. 4 Ann. Lto, Nat. Hist. Vol. VII. 



