S. J. Smith on American Crustacea. 143 



The appendages of the second segment are small and inconspicnous, 

 and their slender tij^s are flexiljle and folded within a little groove on 

 the inside of the bases of the appendages of the first segment. 



Cardiosoma guanhumi Latreiiie. 



Cardisoma g-MawAw^m Latreiiie, Encyclopedie methodique, tome x, p. 685, 1824, {teste 

 Edwards); Edwards, Histoire natureUe des Crust., tome ii, p. 24, 1837; Regne 

 animal de Cuvier, 3™^ edA.\,., pi. 20, fig. 1 ; Annales des Sciences naturelles, S^ie serie, 

 Zoologie, tome xx, 1853, p. 204, pi. 9, fig. 1 ; Gibbes, On the Carcinological Col- 

 lections of the United States, Proceedings American Association, 3d Meeting, 

 p. 179, 1850; Stimpson, Proceedings Academy Nat. Sci., Philadelphia, 1858, p. 100; 

 Saiissure, Crustaces nouveaux des Antilles et du Mexiqiie, p. 21, 1858. 



Ocypode {Cardisoma) cordata DeHaan, Fauna Japonica, Crustacea, p. 27, 1835 [non 

 Cancer cordatus Linne). 



Ocypoda ruricola Freminville, Annales des Sciences naturelles, 2e serie, Zoologie, 

 tome lii, 1835, p. 217 (non Cancer ruricola Linne). 



Ocypoda gigantea PreminviUe, loc. cit, p. 221, 1835. 



Plate y, figure 3. 



The abdomen of the male is broadest at the third segment, from 

 which the margins converge rapidly to the sixth, which is considerably- 

 longer than broad. The terminal segment is narrow and its extremity 

 is rounded. The first pair of abdominal appendages reach to the 

 middle of the sixth segment, are triquetral, straight and stout, and 

 their tips are rounded and slightly flattened laterally, and each is 

 armed with a very small, scale-like appendage directed obliquely out- 

 ward, and on the upper edge, just above this appendages, there is a 

 small process which is straight and does not reach beyond the rounded 

 extremity of the thickened portion of the organ. 



A male from the Florida Keys gives, length of carapax, 65""" ; 

 breadth of carapax, 78'""'; ratio of length to breadth, 1:1-20. 

 Length of merus in right cheliped, 31""°; in left cheliped, 49"'"\ 

 Length of right hand, 45""" ; breadth, 19. Length of left hand, 88'"™ ; 

 breadth, 44. 



Cardiosoma quadratum Saussure. 



See these Transactions, vol. li, p. 16. 



Plate V, figure 4. 



In this species the male abdomen and its appendages are almost ex- 

 actly like those of C. guanhumi except that the hoiny extremities of 

 the appendages of the first segment are a little longer and more slen- 

 der. There is a remarkable difference between the male abdominal 

 appendages of this species and the species from the west coast of 



