30 DESCRIPTION OF 



PLATE XXIX. 



Page 

 Fig. 1. ASTARTELLA VERA. 715 



1 a. View of the exterior of the right valve. 

 1 b. Interior of the same, showing the teeth, etc. 



I c. Cardinal view of another specimen, showing the impressed lunule and ligamental area. 



Fig. 2. DOLABRA ? ALP1NA. 710 



2. View of the left valve, natural size. 



Fig. 3. EDMONDIA ? RADIATA. 716 



3. View of the right valve, from which the shell is partially exfoliated. 



Fig. 4 & 5. NUCULA VENTRICOSA. 716 



4. View of the interior of a left valve. 



5 a. Exterior of the left valve of another individual. 



5 b. Cardinal view of the same. 



Fig. 6. LEDA BELLASTRIATA. 717 



6 a. View of the right valve of a sma'J individual, which is imperfect at the posterior extre- 



mity. 



6 b. Cardinal view of the same. 

 6 c. Interior of the right valve of a larger individual, in which the teeth are broken off on the 



posterior side. 

 6 d. Enlargement of the concentric striae. 



Fig. 7. MACROCHEILUS FUSIFORMIS. 718 



7. View of a specimen (of the natural size), from which the shell is partially exfoliated, and 



several of the volutions at the apex broken off. 



Fig. 8. MACROCHEILUS VENTRICOSUS. 718 



8. View of specimen (natural size), showing the entire spire and a portion of the columellar lip. 



Fig. 9. MACROCHEILUS NEWBERRYI. 719 



9. View of the anterior side of the shell, natural size. 



Fig. 10. MACROCHEILUS PALUDINJEFORMIS. 719 



10. View of the anterior side of the specimen. 



Fig. 11. MACROCHEILUS PRIMOGENIUS. 720 



II a. View of the aperture and columella. 11 b. Anterior side of the same shell. 



Fig. 12. PLEUROTOMARIA TABULATA. 721 



12 . View of the anterior side of a large individual. 



12 fe. View of the aperture, which is imperfect. The specimen figured has the striae much ob- 



literated, and the surface characters are not represented as they exist in other specimens. 



Fig. 13. PLEUROTOMARIA SPH^RULATA. 722 



13 or. Anterior view of specimen. 136. View of the apert ure. 



Fig. 14. EUOMPHALUS RUGOSUS. 722 



14 a. View of the lower side and umbilicus. 

 14 b. Dorsal view, showing the aperture. 



14 c. View of the upper s;de, showing the depressed spire. 



14 d. Cast of the same. 



Fig. 15. BELLEROPHON NODOCARINATUS. 723 



15 a. View of the imperfect aperture and back of the shell. 

 15 6. Lateral view of the same. 



15 c. Dorsal view, showing the double dorsal carina, which becomes nodose towards the aper- 

 ture. 



Fig. 16 & 17. DENTALIUM OBSOLETUM. 724 



16. A fragment near the base of the shell. 



17. A more slender fragment from the upper part of the shell. 

 17 a. Enlargement of the longitudinal striae. 



