June, 1841.] 31 



Solarium. 



Solarium trilineatum. Depressed, conical ; whirls with obsolete 

 spiral lines, and fine transverse striae, an impressed line below the 

 suture ; whirls carinated at base; suture deeply impressed ; pe- 

 riphery carinated, and margined above and beneath by a carinated 

 line ; umbilicus profound, crenate on the margin, and with a 

 submarginal impressed line, striae radiating from the umbilicus, 

 becoming obsolete towards the periphery. Width 1-2 inch. 



Infundibulum. 



Infundibulum perarmatum. Trochiform ; whirls convex, armed 

 with numerous erect foliated spines. Width 1 3-8 inch. 



Allied to I. trochiformis, Lam. but is less variable in form, and 

 has larger spines. 



FlSSURELLA. 



Fissurella Marylandica. Elevated, with numerous striae, alter- 

 nated in size and minutely granulated by fine crowded concentric 

 lines crossing them ; foramen large, regularly oval. Length 1 

 inch. 



Closely allied to F. Griscomi, but is readily distinguished by 

 a much larger foramen, finer concentric lines, in not being late- 

 rally compressed, &c. 



Dispot^ga. 



Dispotaea ramosa. Suborbicular, with broad prominent ribs, and 

 radiating, ramose, wrinkled and highly ornamental striae ; mar- 

 gin profoundly indented by the projecting ribs. Width 1 3-8 inch. 

 This species has been confounded with D. costata, but the 

 ramose lines give it a very distinctive character. Occurs on 

 James River, Virginia. 



Cancellaria. 



Cancellaria biplicifera. Turretted, with thick longitudinal ribs, 

 and spiral rather distant impressed lines ; on the body whirl an 

 occasional intermediate fine line ; space below the suture widely 

 and deeply channelled; shoulder coronated ; umbilicus small ; 

 columella concave, and with two plaits. Length 11-2 inch. 



