65 

 Pentamerus occidbntalis, Hall. 



Plate 9, figs. 3 and 3 a. 



Pentamerus occidentalis, HaW 1852. Pal. N. York, vol. II., p. 341, pi. 79, 



figs. 1, as, and 2. 

 Billings... 1863. Geol. Canada, p. .337, figs. 341, a, 6 and c. 

 Nicholson. 1875. Rep. Pal. Prov. Ont., p. 67, fig. .35. 



Gait, A. Murray, 1847, E. Billings, 1857, and T. C. Weston, 1867 ; 

 Hespeler, T. C. Weston, 1867 ; Elora, Dr. R. Bell, 1861, and T. C. 

 Weston, 1867 ; Durham, J. Townsend, 1878-82. Guelph, Professor H. 

 A. Nicholson; who very justly states that it is " one of the most character- 

 istic brachiopods of the Guelph formation." The unusually perfect 

 specimen represented on Plate 9, was collected at Durham by Mr. 

 Townsend. A specimen from Gait, kindly forwarded to the writer by 

 Mr. B. E. Walker, of Toronto, shows that the surface of this species, when 

 well preserved, is marked by low, rounded longitudinal ribs, which are 

 very unequal in breadth, and crossed by numerous, close-set, minute lines 

 of growth, and by rather distant faint transverse constrictions, indicative 

 of periodic arrests of growth. 



Pentamerus (Bareandella) ventricosus, Hall. 



Pentamerus ventricosus. Hall 1860. Geo . Surv. Wis- 



cons., Kep. Progr., p. 



2,and(I862)Geol.Rep. 



Wisoons. vol. I., p. 



436. 

 Pentamerus ( Pentamerella) ventricosus. Hall 1868. Twentieth Rep 



Reg. N.Y. St. Cab. 

 ^Nat. Hist., p. 374, pi. 



13, figs. 18-21. 

 Pentamerus ventricosus, Nicholson 1875. Rep. Pal. Prov. 



Ont., p. 67. 

 Pentamerus (Pentamerella) ventricosus. Hall & Whitfield. . .1875. Rep. Geol. Surv. 



Ohio, vol. II., pt. 2, 



p. 138, pi. 7, figs. 7 



and 8. 

 Pentamerus ventricosus, Whitfield 1882. Geol. Wiscons. , 



vol. IV., p. 291, pi. 



17, figs. 11-13. 

 Pentamerus (Barrandella J ventricosus, liidl 1893. Pal. N. York, 



vol. VIII., pt. 2, fasc. 



2, pp. 242 and 243. 



Hespeler and Elora, Professor H. A. Nicholson. The writer has never 

 seen a specimen of this species from the Guelph formation of Ontario, nor 

 indeed from rocks of any age in Canada. 



