June, 1841.] 29 



rowed, slightly produced and subangulated at the extremity ; 

 surface with rather prominent concentric wrinkles ; posterior 

 margin obliquely arched ; beaks distant from anterior extremity, 

 and not nearly central; length 1 1-8 inch. Allied to C. 

 Sayana, but is proportionally longer, less ventricose, narrower, 

 and more produced anteriorly. 



LUCINA. 



Lucina Foremani. Orbicular, ventricose, moderately thick ; sur- 

 face with irregular shallow grooves, and rather distant prominent, 

 striae, with intermediate fine, concentric lines ; posterior margin 

 subtruncated obliquely outwards ; beaks prominent, not central ; 

 hinge edentulous. Length 11-2 inch. Named in honour of a 

 zealous scientific young gentleman of Baltimore, Dr. E. Fore- 

 man. 



L. subplanata. Lentiform, convex, depressed, with prominent 

 acute equal concentric striae ; beaks central ; cardinal teeth 

 prominent. Length 3-4 inch. Very rare. 



Cardium. 



Cardium leptopleura. Subtrigonal, ventricose; ribs about 31, 

 prominent, distant, angular, carinated ; umbo prominent, oblique ; 

 lateral teeth very prominent ; inner margin widely and deeply 

 crenate. Length 2 1-4 inches. Height 2 inches. 



ASTARTE. 



Astarte varians. Trigonal, compressed, posterior side, cuneiform, 

 extremity acutely rounded ; umbo flattened, sulcated. Length 

 1 1-4 inch. 



Var. A. Proportionally shorter, more convex, with numerous 

 concentric furrows. 



Allied to A. perplana, but has a much deeper lunule, more 

 oblique teeth, narrower, and more produced posteriorly. 



A. exaltata. Obovate acute, convex ; umbo sulcated ; apex very 

 prominent ; lunule elongated and profound. Height and length 

 equal, 5-8 inch. 



