0RISKAN7 FAUNA OF BECRAFT MOUNTAIN 117 



Flo. 



22 The interior of an incomplete brachial valve showing 



the cardinal process 



23 Interior of the pedicle-valve showing the cardinal area 



and deltidinm 



24 Posterior view of a specimen bearing conjoined valves 



and showing the elevated cardinal area 



25 Cardinal process of the brachial valve. x3 



26 A portion of the external surface enlarged 



27 The cardinal area of the pedicle-valve showing the 



deltidium. x3 



Leptostrophia oriskania sp. nov. 



Page 53 



28 An enlargement of the external surface. x5 



29 Sculpture cast of the pedicle- valve 



30, 32, 34 The external surface of pedicle-valves showing their va- 

 riations in outline and the undulated surface 

 31, 35 The exterior of brachial valves 



Leptostrophia cf. magnifica Hall 



Page 53 



36 The exterior of the ventral valve of a small shell which 



may represent this species 



Stropheodonta lincklaeni Hall 



Page 52 



37 A specimen of the dorsal valve showing a portion of 



the interior with cardinal process and also a part of 

 the external surface 



