Weller — Kinderhook Faunal Studies. 65 



seems to be the impression of a crinoid arm, and very imper- 

 fect cast of a calyx. None of these fragments can be identi- 

 fied, even generically. 



VERMES. 



Indefinite worm burrows are sometimes present in the 

 Chonopectus sandstone, but they are usually not conspicuous. 



MOLLUSCOIDEA. 



BRACHIOPODA. 



LlNGULA MEMBRANACEA Win. 

 PI. I. f. 20. 



" Shell flattened, quadrate-elliptical, nearly as broad near 

 the beak as at the same distance from the anterior margin ; 

 length nearly equal to twice the width ; lateral margins 

 slightly curved ; beak scarcely elevated, near the posterior 

 margin, but with a narrow belt behind it. Shell substance 

 membraneous, marked externally by very delicate, regular 

 concentric lines." Length 12 mm., greatest width 8 mm. 



Remarks. This species is represented in the University of 

 Michigan collection by the single imperfect type specimen 

 with rather indefinite characters. The above description is a 

 copy of the original one by Winch ell. The specimen is im- 

 perfect along the margins, and if it were complete the shell 

 would be wider posteriorly than is represented in the illus- 

 tration. 



Orbiculoidea capax (White). 



PI. I.f. 19. 



" Shell subcircular in outline, dorsal [brachial] valve much 

 convex, apex small, prominent, eccentric, and pointing back- 

 wards. Surface having a rather smooth appearance, but 

 marked by fine lines of growth and these crossed by very faint, 

 somewhat distinct, radiating striae." 



Remarks. The only specimen of this species which has 

 been observed in the Chonopectus sandstone, is the type pre- 

 served in the University of Michigan collection. The speci- 



