PLATE XXIV. 



Page. 

 LOXONEMA BELLA 2f>-^ 



Figs. 1, 1 a. Anterior and posterior sides of the same shell. Natural size. 



PLEUROTOMARI A NE VADENSIS 259 



Fig. 2. Anterior view of a slightly crushed specimen that is denuded of most of the outer 



shell. 



2a. Enlargement of a piece of the outer surface of the shell, to show the peripheral 

 band and surface characters. 



PLATYOSTOMA INORNATUM 255 



Figs. 3, 3 a. Anterior and posterior views of the cast. Natural size. 



GRIFFITHIDES PORTLOCKI 266 



Fig. 4. Central portions of the head. Natural size. 

 4 a. Pygidium. Natural size. * 



4 b. Right free cheek. Natural size. 



MlCRODON (C. ) CONNATUS 250 



Fig. 5, 5 a. Right and left valves. Natural size. 



BELLEROPHOX MAJUSCULUS 



Fig. 6. Dorsal view of a large specimen. A cross-section of the body-whorl of this speci- 

 men is shown in the text. See plate xxiii, figs. 1, 1 a. 



PLATYCERAS Piso 254 



Fig. 7. Dorsal view. Natural size. 



7 a. View of the side denuded of the shell. Natural size. 



7b. The other side of the same specimen, preserving the outer shell. 



MACROCHEILUS, sp. T 260 



Fig. 8. Anterior view of the specimen mentioned in the text. Natural size. 



PLATYCERAS OCCIDENS 254 



Fig. 9. Dorsal view of a small shell, enlarged to two diameters. 

 9 a. Lateral view of another shell similarly enlarged. 



