68 NEW YORK STATE MUSEUM 



BOTOMABIA UlHch. 1 897 



Eotomaria durhamensis Whiteaves (sp.) 



Plate 10, fig. 17 



Pleurotomaria durhamensis Whiteaves, Paleozoic Fossils. 1884. v. 3, 



pt 1, p. 24, pi. 4, fig. 2 

 Pleurotomaria durhamensis Whiteaves, Paleozoic Fossils. 1895. v. 3, 



pt 2, p. 77 



Two internal casts in a not very favorable state of preservation, the 

 larger composed of a spire of five whorls, have been found in the dolomites 

 of this horizon at Rochester and are referred to this species on account of 

 the slow increase of the whorls, the acuminate character of the apex, the 

 obliquely flattened upper side of the whorls and the indication of the for- 

 mer presence of a deep umbilicus. The description of P. durhamensis 

 was based on a single specimen, and that of P. galtensis, which is allied 

 to it but differs in its more depressed spire, on not many more ; Whit- 

 eaves has suggested that the former may prove to be only a variety of the 

 latter. The difference is however a persistent one. 



This and the P. galtensis are here referred to the genus Eotoma- 

 ria, one of the divisions erected by Ulrich for forms heretofore comprised 

 under Pleurotomaria, a genus which, it is asserted by that author, when 

 restricted to forms agreeing closely with the original type is not found in 



the Paleozoic. 



Eotomaria areyi sp. nov. 



Plate 8, fig. a 



This is a large and robust shell bearing somewhat the expression of 

 P. galtensis Billings, 1 but its proportions are larger, stouter and distinct 

 in certain other details. 



Shell depressed conic, broader than high, the thick spire being but 

 slightly elevated ; apical angle between 85 and 90 ; whorls five, increasing 

 slowly in size ; suture not deeply impressed, as the upper surface of the 

 whorls slopes gradually to the preceding ones ; but on the casts there is a 



1 Geol. Sur. Canada. Paleozoic Fossils. 1862. 1 : 154, fig. 136. See Whiteaves, Pale- 

 ozoic Fossils. 1895. v - 3> P* 2 > P- 75s P^- JI > &8- 7- 



