150 BULLETIN OF THE 



Aeheloiis spinimanus De IIaan. 

 Partunus spinimanus Latr ei lle, Encyc. Me'th., X. 188. 

 Lupa spinimana Leach, in Desmarest, Considerat. sur les Crustace's, p. 98. 



II. Milne-Edwards, Hist Nut. dcs Crust., I, 452. 

 Aeheloiis spinimanus De Haan, Fauna Japonica, Crust., p. 8. A. Milne- 



I'.i'\\ lrds, Arch, ilu Museum d'Hist. Nat., X, 341, pi. xxxii. Smith, 



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



Taken in shallow water mi the Florida coast. 



Aeheloiis depressifrons Stm. 

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



p. 12. 



Aeheloiis depressifrons Stimpson, Notes on X. American Crustacea (I860), p. 95. 

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



Key Wot. in from two to five fathoms. 



Two miles south of Rebecca Shoal, in ten fathoms. 



OCYPODOIDEA. 



Family CAECINOPLACIDAE. 



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

 posterior extremity of the sternum. 



Si bfamily EURYPLACINAE. 



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

 forms of Carcinoplacidae (as Pseudorltombila, Eucrate, Pilumnoplax, and 

 Tleteroplax) in having the 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 ami very little developed. The eyes are long ami the 

 antennae are excluded from the orbit by the internal suborbital lobe. 



Euryplax nitida Stm. 

 Euryplax nitida Stimpson, Notes on X. American Crust., p. 14. Smith, Trans. 

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



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

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

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

 very prominent, forming the largest tooth of the anterolateral 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. 

 This pit would, therefore, appear to be a sexual character, belonging to tin; 

 male. 



