256 BULLETIN OF THE 



Family CARDITIDiE. 



GeNCS CARDITA BRUGltEE. 



Cardita domingensis D'Orbignt. 

 C. Dominguensis D'Orbigny, Moll. Cuba, IL p. 291, pi. xxvii. figs. 27-29, 1845. 



Habitat. Station 12, in 36 fnis. off Cuba ; off Sombrero, in 54 I'ms. Ex- 

 tends northward to the Carolina coast. 



D'Orbigny's figure is of a very young shell ; adult specimens are twice as 

 large and have more ribs. 



Family CRASSATELLIDiE. 



Genus CRASSATELLA Lamabck. 



Crassatella floridana Dall. 



Crassatelia antillarum (?) Reeve, ysLT.Jiondana, Dall, Bull. M. C. Z., IX. p. 131, 1881. 



Plate VI. Fig. 12. 



Habitat. Gulf of Mexico, west of the Florida coast, 30 fms. 



The single young specimen obtained as above, and represented by the figure 

 (11.0 X 6.75 mm.), is the only one in the Blake collection. The U. S. 

 Fish Commission have since dredged off the southeastern coast of the United 

 States and in the Gulf of Mexico a considerable number of adult valves of the 

 same species, the description of which I am thus enabled to complete. The 

 largest of these valves measured 78.0 mm. in length and 57.0 mm. in height, 

 the complete shell must have had a diameter of 31.0 mm. When fresh it is 

 covered with a fine bright brown epidermis, which becomes fibrous after death 

 and maceration, or in very aged specimens ; the whole shell in front of the 

 anterior rostral carina is covered with rather even concentric grooves, about 

 1.0 mm. wide. The figure gives a good idea of the somewhat flattened tip 

 of the beaks ; the anterior and posterior areas are depressed, smooth, narrow, 

 and subequal ; the anterior is larger in the left, and the posterior in the right 

 valve; the grooves do not continue behind the flexuosity which marks off the 

 rostrum, tUe area between that and the dorsal area or corselet is merely con- 

 centrically striated ; the interior is pinkish chocolate, pink, or white, darker 

 behind; the muscular scars are rounded, strong, but rather small; the pedal 

 scar is close behind the upper corner of the anterior adductor, and is strongly 

 marked. 



