77 



Pleueotomaeia occidens, Hall. 



Phurotomaria occidens, Hall. 1867. Twentieth Rep. Reg. St. N. York, p. 364, pi. 

 15, figs. 11 and 12. 

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



pt. 2, p. 142, pi. 8, fig. 3. 



Elora, T. C. Weston, 1867 (one specimen), and J. Townsend, 1892 (one 

 specimen) ; both with a considerable portion of the test preserved. In 

 Ms memoir on the Silurian Gastropoda and Pteropoda of Gotland (page 

 113), Professor Lindstrom includes F. occidens among the synonyms of 

 P. labrosa, HaU. This latter species was collected by Sir W. E. Logan, 

 in 1843, from limestones of about the age of the Niagara limestone at 

 Port Daniel, P.Q., and from the supposed Lower Helderberg limestone 

 between Cape Gaspe and Cape Rosier. 



Pleueotomaeia cyclostoma, Whiteaves. 



Pleurotomaria cyclostoma, Whiteaves. 1884. This volume, pt. 1, p. 23, pi. 3, figs. 

 12 and 12 a. 



Durham, J. Townsend, 1874-82 : two specimens. 



Pleueotomaeia Duehamensis, Whiteaves. 



Phurotomaria Durhamensis, Whiteaves. 1884. This volume, pt. 1, p. 24, pi. 4, 



fig. 2. 



No other specimen of this species has been obtained, to the writer's 

 knowledge, than the one which was described and figured in the first part 

 ■of this volume. A salient feature in this specimen is the slender acumi- 

 jiate apex, which is composed of no less than four minute but distinct 

 volutions. It may prove to be only a variety of P. Galtensis. 



Pleueotomaeia Townsendii. (N. Sp.) 



Plate 15, fig. 9. ' 



Shell small, turbinate, naticoid, a little higher than broad, spire elevated, 

 biut, in its dorsal aspect, distinctly shorter than the last volution : base 

 imperforate. Volutions five in number, increasing rather rapidly in size, 

 those of the spire convex and rounded, the outer one moderately inflated 

 and a little broader than high. 



The surface markings are indicated only in the concave mould of the 

 exterior (or convex surface of the test) of the last volution and part of the 

 last but one, of the specimen figured. To the naked eye the surface of 



3^ 



