408 DESCRIPTIONS OF NEW SPECIES OF FOSSILS, 



FIG. 13, a. Capulus occidentalism cast of interior of convex valve. 



" 13, b. Profile view of same. 



" 13, c. Base of same. 



" 13, d. Surface-markings of the base, magnified. 



PLATE II. 



FIG. 1, a. Inoceramus sublavis, right valve, nearly entire. 

 " 1, b. A portion of the surface magnified. 



FIG. 2, a. Inoceramus convexus, left valve. 

 " 2, b. Profile of same, looking upon the hinge lirie. 



FIG. 3, a. Inoceramus tenuilineatus, left valve. 

 " 3, 1. A portion of the surface of the anterior part of the shell, magnified. 



FIG. 4. A portion of the striated surface of the shell of Inoceramus sagensis, magnified. 



FIG. 5, a. Inoceramus Conradi, the exterior portion of the shell of both valves, which are distorted by 



pressure. 

 " 5, b. Surface of same, magnified. 



FIG. 6, a. Inoceramus fragilis, natural size. 

 " 6, b. Surface of same, magnified. 



PLATE III. 



FIG. 1, a, b. Natica obliquata, two views of the same shell. 



FIG. 2, a. Natica concinna, natural size. 

 " 2, J, c. Two views of the same, magnified. 

 " 2, d. The surface striae, magnified. 



FIG. 3, a, b. Natica paludinceformis, two views of individuals of different size. 

 " 3, c. The surface magnified, showing the cancellated striae. 



* 

 FIG. 4, a. Actaon concinnus, natural size. 



" 4, 5, c. Same, magnified nine times. 



" 4, d. Surface-markings, highly magnified. 



FIG. 5, a. Buccinum vinculum, natural size. 

 " 5, b. Magnified view of the same. 



FIG. 6, a. Fusus Shumardi, natural size. 



" 6, b. Magnified view of the opposite side of the same shell. 

 " 6, c. Surface-markings, magnified. 



