I go 



NEW YORK STATE MUSEUM 



plications near the middle of the valve, the second a quite distinct result 

 produced by the inception of more numerous equal plications at the beak. 

 The former is essentially equivalent to the S. parva (Schoharie grit, 

 N. Y.) but has not attained quite such an extreme of subdivision. 



Brachyprion majus Clarke 



Plate 36, figures 1-6 



Strophomena inequiradiata Billings. Palaeozoic Fossils. 1874. v. 2, 



pt I, p. 24 (not fig. 13), pi. 2, fig. 4 

 Brachyprion majus Clarke. N. Y. State Mus. Mem. 3. 1900. p. 54, pi. 8, 



fig. 8-13 



The typical Stropheodonta inequiradiata Hall may or may 

 not be free of trace of corrugations but its surface striation early loses its 

 fasciculate character, the striae becoming irregular and subequal. In dis- 

 tinction from this character Brachyprion majus of the Becraft moun- 

 tain Oriskany, a shell of similar proportions, maintains the fasciculation of 

 its striae throughout growth, though on internal casts this striation is 

 obscured and so far as observed it has never manifested any trace of 

 corrugations. 



Such shells highly convex at maturity occur in the Grande Greve lime- 

 stone and have been identified by Billings with Strop h. inequira- 

 diata. They are in all essential particulars identical with shells of 

 Brachy. majus, rather large ventral valves, convex specially in late 

 growth and with the cardinal row of denticulations extending about half the 

 length of the hinge. In respect to muscle scars there is also agreement in 

 both, the area in the both valves being relatively small and flabelliform. In 

 the dorsal valve the denticulations are shown to extend but little more than 

 halfway from the low bifurcate cardinal process to the hinge angles. 



Localities. At Grande Greve and Indian Cove. 



Leptostrophia magnifica Hall 



Plate 38, figures 1-2; plate 39, figures 9, 10 



Strophodonta magnifica Hall. New York State Cab. Nat. Hist, loth An. 



Rep't. 1857. p. 54 

 Strophodonta magnifica Hall. Palaeontology of New York. 1859. 3:414, 



Pl- 93, fig- 4;.pl- 94, fig. 2a-d; pi. 59, fig. 8 

 L ept o s t r o p h ia m a gn i f i c a Clarke. New York State Mus. Mem. 3. 1900. 



p. 53, pl- 7, fig- 36 



This large and fine perplane stropheodontid occurs in such form in the 

 Grande Greve limestones as to complete in some measure our knowledge of 

 its surface characters. Heretofore accounts and illustrations of it have 

 been chiefly based on casts but in these limestones Avhere the species is 



