262 



Report of the State Geologist. 



striae, and a few obscure radiating lines are usually visible. Two specimens 

 measure 6 and 5.5 mm. in height by 3.5 and 3 mm. in width respectively. 

 The specimens are slightly larger and somewhat more convex than the pre- 

 vailing form. The beaks are likewise less attenuated. Nevertheless I can 

 regard this simply as a variety of this species. 



73. LlNGULA, Sp. 



In the aS. demissa bed was found a fragment of a valve having a nearly 

 straight front, somewhat lamellose lines of growth, and distinct radiating 

 striae. The specimen is of medium size. 



Genus Orbiculoidea, D'Orbigny. 



74. Orbiculoidea media, Hall. 

 1867, Hall, Pal. K Y., vol. 4, p. 20, pi. 2. 



1892, J. Hall and J. M. Clarke, Pill. N. Y. vol. 8, pt. 1, p. 120. 



This species is not uncommon in these rocks. It usually occurs in 

 clusters and seems to be confined to distinct layers. Specimens were obtained 

 about ten feet below the Encrinal limestone, and in the middle and upper 

 Moscow shales. A large distorted specimen from Section B., fourteen to 

 seventeen feet below the Encrinal limestone, belongs to this species. 



75. Orbiculoidea doria, Hall. 

 1867, Hall, Pal. N. Y., vol. 4, p. 19, pi. 2. 



1892, J. Hall and J. M. Clarke, Pal. N. Y., vol. 8, pt. 1, p. 120. 



A few specimens which resemble this species, but are not attached to 

 other fossils, were found in the Moscow shale associated with O. media ((9. 

 media lt d.) 



76. Orbiculoidea Lodensis, Yanuxem. 



1867, Hall, Pal. N. Y., vol. 4, p. 22, pi. 2. 



1892, J. Hall and .! . M. Clarke, Pal. N. Y., vol. 8, pt. 1, p. 120. 



In the S. demissa bed were found small brachial valves. Fine concen- 

 tric striae are visible on the specimens, and faint radiating lines appear on all 

 parts <>f the shell. From slight exfoliation, the long, narrow, slit-like depres- 

 sion on the anterior slope of the beak ha; become visible in the brachial 

 valve. (See Pal. N. Y. vol. 4, pi. 1, fig. 14 e.) This depression extends 

 about one-third the distance from the beak to the anterior margin. The 



