150 BULLETIN OF THE 



Acheloiis spinimanus De Haan. 



Portunus spinimanus Latkeille, Encyc. Me'th., X, 188. 



Lupa spinimana Leach, in Desmarest, Conside'rat. sur les Crustaces, p. 98. 

 H. Milne-Edwards, Hist. Nat. des Crust, I, 452. 



Acheloiis spinimanus De Haan, Eauna Japonica, Crust., p. 8. A. Milne- 

 Edwards, Arch, du Museum d'Hist. Nat., X, 341, pi. xxxii. Smith, 

 Trans. Conn. Acad, of Arts and Sciences, II, 9. 



Taken in shallow water on the Florida coast. 



Acheloiis depressifrons Stm. 



Amphitrite depressifrons Stimpson, Notes on N. American Crustacea (1859), 



p. 12. 

 Acheloiis depressifrons Stimpson, Notes on N. American Crustacea (1860), p. 95. 



A. Milne-Edwards, Arch, du Museum d'Hist. Nat., X, 342. 



Key "West, in from two to five fathoms. 



Two miles south of Rebecca Shoal, in ten fathoms. 



OCYPODOIDEA. 



Family CARCINOPLACIDAE. 



In this family the base of the abdomen covers the entire width of the 

 posterior extremity of the sternum. 



Subfamily EURYPLACINAE. 



The genus Euryplax is the type of a group which differs from the usual 

 forms of Careinoplacidac (as Pseudorltombila, Eucrale, Pilumnoplax, and 

 Helerophu) in having tin- verges lodged in covered or closed canals, and 

 in having the anterior corners of the posterior segment of the sternum ex- 

 posed instead of being covered by the abdomen. The first joint of the 

 abdomen is narrow and very little developed. The eyes are long and the 

 antenna? are excluded from the orbit by the internal suborbital lobe. 



Euryplax nitida Stm. 

 Euryplax nitida Stimtson, Notes on N. American Crust., p. 14. Smith, Trans. 

 Conn. Acad, of Arts and Sciences, II, 162. 



The female, now for the first time described, differs remarkably from 

 the male in its narrower and more convex carapax, in which the broadest 

 part is at the second antero-lateral tooth. The outer angle of the orbit is 

 von- prominent, forming the largest tooth of the antero-lateral margin, 

 the posterior tooth of which is the smallest ; just the opposite of what 

 occurs in the male. There is no pit on the meros joint of the chelipeds. 

 Tins pit would, therefore, appear to be a sexual character, belonging to the 

 male. 



