v 



EXPLANATION OF PLATE 1/ 



Page. 

 Obolella discoidea, y 205 



Fig. 1. View of a dorsal valve, enlarged, showing the orbicular form. 



2. View of a ventral valve, showing the truncated beak. Enlarged. 



LlNGULEPIS? MINUTA -. 206 



Fig. 3. View of a cast of the shorter valve, enlarged, showing muscular scars. 



4. View of the cast of a long valve enlarged, showing the muscular scars more spreading 

 than in the other valve. 



LiXGULEPIS MiERA 206 



Fig. 5. View of a supposed ventral valve showing the extended beak. 



6. A larger valve having a shorter beak. This may be a dorsal valve. 



7. Outline showing the relative gibbosity and length of the two valves. 



LiNGTiLEPis Ella 232 



Fig. 8. View of a dorsal (?) valve showing the truncation of the beak. Enlarged to two 

 diameters. 



Oiauis PoGONiPENSis 232 



Fig. 9. View of a dorsal valve of rather more than the ordinary size. Enlarged. 



10. A ventral valve of the ordinary size, aud of an elongate form, showing the elevation 

 of the beak. 



KUTOUGINA MINUTISSIMA 207 



Fig. 11. View of a dorsal valve, greatly enlarged, showing the peculiar striae and the faint 

 radiations on the surface. 

 12. A ventral valve having a more elongate form. 



LEPTiENA Melita 208 



Figs. 1.3-14. Views of two different individuals, showing variation in the surface-characters. 



Strophomena Nemea 233 



Fig. 15. View of the specimen described, showing the general form and surface-striae. 



Porambonites obscukus 234 



Fig. 16. View of the exterior of a ventral valve, showing the lamellae projecting inward from 

 the beak. 



Maclurea minlma 235 



Fig. 17, View of the spire of an internal cast of a specimen. Enlarged. 



18. View of the flat side of the same individual. 



19. Protile view of the specimen, showing the depth of the shell. 



* The line drawn by the side of figures indicates tlie natural size. 



