PLATE 27. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
b. 
472. 6. Avictjla emacerata. 
(Pag. 83.) 
2. 473. 7. Avictjla rhomboidea. ( Pag. 84.) 
2 a. A large individual, in which the anterior wing is less prominent than usual. 
2 6. A smaller specimen. 
2 c. A young specimen, having the length nearly equal to the height. 
2d. The posterior portion of another specimen, having the striae more perfectly preserved and the angle of 
the wing more extended. 
3, 12. 480. 1 . Pyrenomceus cuneatus. ( Pag. 87.) 
3. This specimen, though differing to some extent in form, I have referred to the same species. It retains 
the shell, which is faintly striated, the beak remarkably elevated, and the anterior extremity abruptly 
rounded. 
12 a, b. The casts of opposite valves of specimens nearly of the same size. 
12 c. The cast of a large individual, showing several prominent folds parallel to the lines of growth. 
4. 479. 1. Posidonia? ALATA. (Pag. 87.) 
5. 6. 474. 19. Modiolopsis subalatus. ( Pag. 84.) 
5. A fragment of slate, with figures of the right and left valve. 
6 a, b. Figures of the right valve of two specimens of large size. 
7. 475. 6. Tellinomya lata. (Pag. 85.) 
8. 9. 476. 7. Tellinomya mach.eriformis. (Pag. S5.) 
8 a. The left valve of an individual of ordinary size. 8 b. The right valve of a large individual. 
8 c. The right valve of a smaller individual. 
8 d. A small portion of the surface much enlarged, showing the concentric striae. 
9. (Cypricardia angusta, Geol. Rep. 4th District, pag. 76, fig. 6.) 
10, 13. 477. 
11 . 
11 a. 
11 b. 
8. Tellinomya curta. 
4. Orthonota curta. 
478. 
The right valve of a specimen of natural size and proportions. 
A specimen of the left valve, narrowed by pressure. 
(Pag. 86.) 
(Pag. 86.) 
