PLATE 30. 
Fig. 1. 496. 1. Myalina mytiliformis. (Pag. 100.) 
1 a. The right valve of this species somewhat compressed, and having the anterior expansion broken off in 
part. 
1 b. The right valve of another specimen, less compressed than the preceding. 
1 c. A specimen preserving both valves, which are partially open along the cardinal line. The lower portion 
of both valves is broken off. 
1 d. The left valve of the preceding specimen, compressed so that it appears much narrower than its natural 
form. 
Fig. 2. 497. 20. Modiolopsis ovatus. ( Pag. 101.) 
2 a. The left valve of a specimen of ordinary size. 
2 b. The right valve (imperfect) of a large individual. 
Fig. 3, & 4 a. 498. 21. Modiolopsis subcarinatus. (Pag. 101.) 
3 a. A young individual of this species. 
3 b, c. The right valves of two individuals of medium size. 
3 d. The left valve of an older individual. 
4 a. This individual has nearly the same form as figs. 3 b and 3 c, but is more compressed, and concentric 
folds are not at all conspicuous. 
499. 9. Tellinomya elliptica. 
( Pag. 102.) 
Fig. 5. Cypricardia? { n . s .). (Pag. 102.) 
5 a. View looking upon the cardinal line. 
5 b. Lateral view of left valve, which is crushed, showing the outline of the right valve beyond. 
