PLATE 94, 
Page 
1 a - d. Lept^ena? ntjcleata. 419 
1 a , b. Ventral and profile views of the cast. 
1 c. Cardinal view. 
1 d. Profile view enlarged. 
2 a - d- Stkophodonta magnifica. 414 
2 a. The impression of the dorsal valve of this species in sandstone. The cavities of the car¬ 
dinal process arc not shown in the figure. 
2 b. A cast taken from a similar mould, showing the diverging divisions of the cardinal process, 
cronulated hinge-line, muscular impressions, etc. ( The details of the marking are not 
well shown in this figure.) 
2 c, d. The impressions of the same in sandstone, the marking being preserved in different 
degrees of perfection in the two specimens. 
2 e, /, & 3. Si'RornoMENA rugosa, var. ventricosa. 417 
2 e. A cast taken from the impression of a dorsal valve in sandstone. 
2/. An impression of the dorsal valve in sandstone. 
3. A cast in sandstone of the ventral valve. The specimen has been weathered, and the parts 
arc not so salient as they otherwise would be : the hinge-line is obliterated in the speci¬ 
men. 
4. 
Ortitis IlIPPAKIONYX. 
407 
4. The cast of the dorsal valve of a young shell of this species. 
