ORISKANY FAUNA OF BECRAFT MOUNTAIN 41 



Camarotoechia oblata Hall 



Plate 5, flg. 22 



For figures see Paleontology of New York. v. 3, pi. 102, fig. 1, 2 



A number of large shells possess the numerous sharp, simple ribs 



of this species, with its low fold and shallow sinus bearing 10 to 14 



of the plications. The distinction between C. oblata and C. p 1 i o- 



pleura Conrad is not well marked in these shells. 



Camarotoechia dryope Billings (sp.) 



Plate 5, flg. 20, 21 



1874. Iihynchonella dryope Billings, Geol. sur. Canada; Paleozoic fossils, 

 v. 2, pt 1, p. 37, pi. 3, fig. 1, a-c 



A well preserved shell, silicified without distortion, has a sharply- 

 elevated median fold and sinus and angular plications, of which there 

 are four on the fold, three on the sinus and five or six on each lateral 

 slope. The general aspect of the exterior is shown in the figures on 

 plate 5. 



On comparison of this species with the figures of Rhynchonella 



dryope given by Billings there seems excellent reason for regarding the 



forms as identical. The Canadian shell is from Gaspe, limestone no. 



8, to the character of whose fauna special reference is made on a 



subsequent page. 



Camarotoechia, sp? 



This shell, of which several distorted specimens have been observed, 

 is of about the same dimensions as the preceding species, but its fold 

 and sinus are less prominent and not angular in front. The ribs are 

 more numerous and not angular but rounded, there being five or six 

 on the fold and sinus and seven or eight on the lateral slopes. 



Anastrophia, sp. nov. 

 The collections contain a single crushed internal cast of an 

 Anastrophia, unlike described species in the very fine plication of 

 the surface. It bears eight ribs on the median fold and 16 on each 

 lateral slope. The genus has not before been recorded from horizons 

 above the Helderbergian. 



