101 



Orthoceras Darwini, Whiteaves 1884. This volume, pt. 1, p. 38, pi. 6, figs. 



2 and 2 a. 



Cyrtoce^as Myrice, Whiteaves 1884. Ibid., p. 39, pi. 6, figs. 3 and 3 a. 



Orthoceras Darwini, Foord 1888. Cat. Foss. Cephal. Brit. Mus. , pt. 



1, p. 76, fig. 8. 



The type of this species is the abnormally compressed and badly preserved 

 cast of the interior of a shell collected by E. Billings in 1857 at Hespeler 

 (then called New Hope), referred to on page 38 of the first part of the 

 present volume and figured on Plate 6. Two additional specimens, both 

 undistorted and well preserved casts of the interior of the shell, were 

 collected by Mr. Townsend at Durham between the years 1878 and 1882, 

 and one of these is figured on Plate 6 of the first part of the present 

 volume under the name Cyrtoceras Myrice. This latter specimen is remark- 

 ably similar to Professor Blake's figure (Plate 7, fig. 1) of 0. angulatum 

 in the first part of his " British Fossil Cephalopoda," which Mr. Foord 

 says represents 0. virgatum, Sowerby. It seems to the writer that there 

 is very little difference between 0. Darwini, Billings, 0. hellatulum, Bill- 

 ings, and 0. virgatum. Sowerby. In the Museum of the Survey there is 

 a small well preserved fragment of an Orthoceras, collected by Dr. R. Bell 

 in 1862 from the Silurian (Upper Silurian) rocks at L'Anse a la Vieille, 

 in the Bale des Chaleurs, which was identified with 0. virgaturn, Sowerby, 

 by E. Billings. The surface ornamentation of this specimen Consists of 

 very narrow longitudinal ridges, with extremely fine, numerous and equi- 

 distant, transverse raised lines in the rather wide spaces between them, 

 thus producing a cancellated appearance when the speciinen is placed in 

 a favourable light. '' 



Oethoceeas annulatdm, var. Ameeicanum. 



Orthoceras amiidatum (?), Hall 18.52. Pal. N. York, vol. II. , p. 96, 



pi. 29, fig. 3. 

 Orthoceras annidatuni. Hall 1852. Ibid., p. 293, pi. 64 and pi. 



65, fig. 3. 

 Orthoceras nodocostatum, McChesney 1861. New Palseoz. Foss., p. 94, 



pi. 9, fig. 5. 



Orthoceras undviatum, Billings 1863. Geol. Canada, p. 325. 



Orthoceras nodocostatum, McChesney 1866. Trans. Chicago Ac. Nat. Sc. , 



vol. I., p. 53, pi. 9, fig. 5. 

 Orthoceras annvlatum. Hall 1867. Twentieth Reg. Rep. N. 



York St. Cab. Nat. Hist., p. 351, 



pi. 20, figs. 4-6. 

 " \ 1870. lb.. Rev. ed., p. 411, pi. 24, 



figs. 2-4. 

 Hall and Whitfield 1875. Geol. Surv. Ohio, vol. II., 



pt. 2, p. 147, pi. 9, fig. 1. 



