OBISKAKT FAUNA OF BECBAFT MOUNT AtN 113 



Coelospira concava Hall 



Page 43 

 Fio. 



23 Dorsal view. x3 



24 Ventral view. x2 



25 The interior of the brachial valve. x2 



26 The interior of the pedicle- valve showing the muscular 



impressions. x3 



Coelospira dichotoma Hall 



Page 43 



27 Dorsal view of the exterior. x3 



28 Ventral view of the exterior of the same specimen. x3 



29 Internal cast of the pedicle-valve showing the muscular 



scars. x3 



30 View of the interior of the brachial valve. x2 

 31, 32 Dorsal and ventral views of the exterior. x2 



Leptocoelia flabellites Conrad 



Page a 



33, 34 Dorsal and ventral views of an average specimen 

 35, 36 Dorsal and ventral views of the specimen in which the 

 fold and sinus are not so pronounced 



