BRACHIOPODA — TELOTREMATA. 



287 



253. C. tethys (Billings). (Fig. 352, a-c.) Devonic. 



Differs from C. contracta in its subtrigonal form and broader sinus 

 and fold which here bear 5 or 6 plications each. 







a 



g 



Fig. 352. a-c, Camarotanhia tethys. (After Nettelroth.) d-g y Camarotcechia 

 contracta (Pal. N. Y. IV.). h, Leiorhynchus sinnatum. (After Walcott. ) 



Onondaga of New York, Ohio, Kentucky, Indiana, Nevada, 

 Ontario. 



254. C. dotis Hall. (Fig. 353.) Devonic. 

 Subtriangularly ovate- with shallow sinus and moderate fold. 



Pedicle valve slightly flattened at the sides. Plications about 18 

 in number of which there are 3 or 4 in the 

 sinus and 4 or 5 on the fold. 



Marcellus and Hamilton of New York, 

 Ohio. 



255. C. horsfordi Hall. (Fig. 354, a,b.) 



DD v 6 J " ' ; FIG. 353. Camarotce- 



DevoniC. chiadotis% fG rabau.) 



Length to width as 5 to 6 or 7. 

 Brachial valve very convex. Pe- 

 dicle valve depressed- convex 

 with Mnus appearing first at 

 about the middle of the shell, 

 abruptly curved upward in front. 

 1 5-24 angular plications on each 

 valve, of which 4-7 mark the 

 sinus and fold. 



Marcellus and Hamilton of 

 New York, Nevada. 



c d. 



Fig. 354. a-b, Camarotccchia horsfordi ; 

 c-d, Camarotazchia sappho (Pal. N.Y.IV. ). 



