1889.] NATURAL SCIENCES OF PHILADELPHIA. 297 



Devonic and Carbonic, while in this country the genus is confined 



chiefly to the latter. 



Murchisonia prolixa White and Whitfield. 



Murchisonia prolixa White and Whitfield, 1862. Proc. Boston 

 Soc. Nat. Hist., vol. VIII, p. 303. 



A very characteristic, though not common, shell from the oolitic 



hands of the upper Kinderhook. It is usually found in a more or 



less fragmentary condition and the structural features are there- 



fore seldom well shown. The whorls are eight to twelve in 



number, slightly convex, with a broad obtuse angularity centrally. 



The surface is ornamented by small well-defined revolving costa?, or 



ihread-like lines, the one passing along the middle of the whorls 



leing the most pronounced, while those below the median one are 



considerably smaller than those above. 



Three other species from this locality have been referred by 

 Vinehell to Murchisonia, but all are more or less imperfect and their 

 trie affinities uncertain. The first of these, 31. quadricincta, is said 

 tn be characterized by four small costa- below the revolving band. 

 Tie other two are 31. neglecta and M. shumardiana. 



Belerophon bilabiatus White and Whitfield. 



Jtellerophon bilabiatus White and Whitfield, 1802. Proc. Boston 

 Sod Nat. Hist., vol. VIII, p. 304. 



Specimens of this species have recently been obtained in white 

 silic\ous nodules. The deeply and broadly emarginate lip, the 

 nearv glabrate surface and a sharp narrow median carina readily 

 distiiguish this form from the associated species of the genus. 



Bellerphon panneus White. 



Betfrophon panneus White, 1862. Proc. Boston Soc. Nat Hist,, 

 vol. 1%, p. 21. 



She! globose, composed of three or four gradually enlarging 

 volutiois, which are visible in the rather small, very deep umbilici ; 

 periphey somewhat flattened, with a very prominent longitudinal 

 carina : he surface marked by sharp, equidistant costa passing 

 transverftly across the whorls from the larsre median ridge: 

 transversa carina? more or less undulating and irregular, bending 

 forward sightly as they leave the central prominence; finer lines of 

 growth arevisible between the costa 2 . This species bears a striking 

 resemblanc to B. tangentialis Phillips from the Carbonic clays of 



