2 34 NEW Y0RK STATE MUSEUM 



these characters spring most distinctly into the eyes, when whole groups 

 are observed, I have reproduced such in natural size as they were found 

 upon the slabs. The forms are : 



Corynoides calicularis Nicholson C. curtus Lapworth 



C. gracilis Hopkinson var. comma nov. 



mut. perungulatus nov. 



Of these C. calicularis is restricted to the Normanskill shale; 

 C . gracilis is very common in the same beds in a mutation (per u n g u- 

 latus) and found in association with C. calicularis. The typical 

 form is somewhat younger and persists into the Lorraine beds, but is absent 

 in the Utica shale. C. curtus is a Utica form and the var. comma has 

 been observed only in the lowest Utica horizon at Mechanicville, where it 

 is, however, a common form. C. calicularis and C. curtus var. 

 c o m m a did not pass out of the Appalachian basin, except to the east, 

 where the former occurs in Canada and Great Britain. C . gracilis and 

 C. curtus, however, were carried beyond the western barrier into the 

 Mississippi basin and have been found in the Mohawk valley and Arkansas. 



The genus appears in the Normanskill shale and dies out again at the 

 end of Lorraine time. Its range does not seem to be greater in Europe. 



Corynoides calicularis Nicholson 



Plate 13, figures 1, 6-8 



Graptolite germs Hall. Pal. N. Y. 1859. 3: 508, fig. 7 

 Graptolite germs Hall. Can. Org. Rem. Dec. 2, 1865. pi. B, fig. 19 

 Corynoides calicularis Nicholson. Geol. Mag. 1867. 4: 108; pi. 7, fig. 9-1 1 

 Corynoides calicularis Hopkinson. Geol. Mag. 1872. 9:502 

 Corynoides calicularis Nicholson. Monogr. Brit. Grapt. 1872. p. 132, figure 

 ? Corynoides calicularis Nicholson. Ann. & Mag. Nat. Hist. 1873. 11:143 

 Corynoides calicularis Lapworth. Cat. West. Scottish Foss. 1876. p. 7; pi. 4. 



fig. 91 

 Corynoides calycularis Lapworth. Belfast Nat. Field Club Rep't & Proc. v. 1. 



pt 4 apx. 1877. pi. 7, fig. 18 

 Corynoides calycularis Linnarsson. Sveriges Geol. l T inters. Ser. C, no. 31. 



1879. p. 18 

 Corynoides calycularis Lapworth. Roy. Soc. Can. Proc. & Trans. 1SS7. 4: 177 



