PLATE LXXXV. 
1. Cyprina Cuneata. ( Wedge-shaped Cyprina.) Transversely elongated, cuneiform ; posterior 
side lengthened, acuminated; beaks prominent, curved; lunette cordiform, hollow; back convex ; 
base straight; surface, with shallow lines of growth; valves deep; shell thin. 
2. C. Triangularis. ( Triangular Cyprina.) Triangular, elongated; beaks central; sides equal, 
posterior one sub-truncated; surface smooth, with shallow lines of growth. 
3. C. Transversa. ( Transverse Cyprina.) Transversely ovate, gibbose; beaks obtuse, incurved; 
posterior side elongated; back arcuated, forming an angle with basal line; with an elevation fiom 
beaks to margin; surface smooth, with shallow lines of growth. 
4. Artemis Sinuata. ( Sinuated Artemis.) Lentiform, gibbose; surface, with many, filiform, 
concentric striae on disc, and sub-lamellated on sides; posterior side, with longitudinal sulcus; lunette 
cordiform, with fine, concentric striae. 
5. A. Lentiformis. (Lentil-shaped Artemis.) Orbicular, compressed; anterior side angulated; 
surface, with many, imbricated, concentric ridges. 
6. A. Exoleta. (Worn Artemis.) Orbicular, lentiform, convex; anterior side, with faint, longi¬ 
tudinal sulcus; surface, with many, concentric, filiform striae; lunette cordiform, with iongitudmai 
striae. 
7. C. Equalis. (Equal Cyprina.) Sub-orbicular, convex; beaks obtuse, incurved; hinge strong; 
surface, with many concentric striae and a few lines of growth; shell very thick. 
8. C. Planata. (Plain Cyprina.) Orbicular, sub-cordiform, gibbose; beaks obtuse; with a 
sulcus from beaks to margin on posterior side; surface, with shallow lines of growth. 
9. A. Parva. (Small Artemis.) Orbicular; surface smooth, with a few, distinct lines of gioivth. 
Diameter, £ in. 
10. C. Angulata. (Angulated Cyprina.) Transversely ovate; beaks short, obtuse, incurved; 
anterior side, with longitudinal ridge, slightly truncated; surface smooth. 
( 104 ) 
