PLATE 106 . 
Pag* 
Fig. la-/. Leptocxelia flabellites. 44& 
1 a, b, c, d. Dorsal, ventral, and profile view of this species. ( The figures, unfortunately, 
represent too many plications by two on each side of the centre.) 
1 e. The interior of the dorsal valve, showing the cardinal process, etc. 
1 /. A cast or impression of a larger dorsal valve. 
Fig. 2 a-l. Renssel^eeia ovalis. 458 
2 a. The ventral valve of a specimen, which partially preserves the shell on the upper part. 
2 b. Another specimen from which the shell is partially removed. 
2 c. Profile of the same, showing the inflected margins of the shell. The specimen has been 
flattened by pressure. 
2d. Ventral view of a well-preserved east of this species. 
2 e. Dorsal view of the same, showing the muscular impression, imprints of the hinge-plates, 
and the dental plates preserved in the cast of the rostral cavity of the opposite valve. 
2 /. Profile view of the preceding specimen. 
2 g. The upper portion of the preceding specimen enlarged. The indentations on the hinge¬ 
line are due to marks sometimes shown on the valves of old specimens of some or all the 
species of this genus. 
2 h. The cast of a smaller specimen, showing the muscular area and the marks of the ad¬ 
ductor muscles. 
2 i, k, l. Dorsal and ventral views of imperfect casts of this species. 
