95 



HoLolpEA GUELPHENSIS, Billiiigs. , 



Holopea Guelphensis, Billings 1862. Geol. Surv. Canada, Pal. Foss., vol. I., p. 



159, fig. 143. 



" 1863. Geol. Canada, p. 343, fig. 351. 



" " Kicholson. . . .1875. Rep. Pal. Prov. Ont., p. 72, pi. 3, fig. 18. 



Gait, A. Murray, 1847; Elora, D. Boyle, 1874; and Durham, J. 

 Townsend, 1878-82 : a few casts of the interior of the shell. 



This species is very imperfectly characterized, and may be referable to 

 Polytropis rather thaa to Holopea. 



Holopea Gracia, Billings. 



Plate 14, fig. 3. 



Holopea (rrada, Billings 1862. Geol. Surv. Canada, Pal. Foss., vol. I., 



p. 159. 

 Whiteaves 1884. This volume, pt. 1, pi. 3, fig. 4. 



Gait, E. Billings, 1857 : a single cast of the interior of the shell. The 

 base of this specimen was originally covered with the matrix, and in the 

 original description of the species it is stated that the umbilicus and sur- 

 face markings are unknown. This matrix has since been removed and 

 the base of the cast found to be compressed convex exteriorly, and de- 

 pressed in the centre, with a very narrow umbilicus partially filled by the 

 inner lip below. Remains of the surface markings show that they con- 

 sist of lines of growth that curve obliquely and somewhat convexly back- 

 ward above, and concavely backward below. As stated on page 18 of the 

 first part of the present volume, two specimens, which are probably very 

 large individuals of this species, were collected by Mr. Townsend at Dur- 

 ham, between the years 1874 and 1882. 



Holopea (?) occidentalis, Nicholson. 



Holopea (?) occidentalis, Nicholson. .1875. Rep. Pal. Prov. Ont., p. 85, fig. 00. 



Elora, Nicholson. This species is not represented in the Museum of 

 the Survey, and the writer has never seen a specimen of it. As stated on 

 page 91, and, judging by the figure, it may have been based upon a cast 

 of the interior of the shell of a large and high-spired variety of Polytropis 

 macrolineatus. 



