85 



shewing the characters of the entire outer volution, which is encircled by 

 three spiral keels. The aperture is circular and the outer lip slightly 

 expanded. 



In 1892, however, Mr. Townsend obtained natural moulds of the ex- 

 terior of two shells (one at Elora and the other at Belwood), which have 

 convinced the writer that the specimens upon which M. soluta and M. 

 tropidophora were based, are merely different states of preservation of the 

 same species. Pig. 7, on Plate 12, represents a wax impression of the 

 mould from Elora, and fig. 8, on the same plate, a similar impression of 

 the mould from Belwood. These show that, when the test is preserved, 

 the spire is encircled by three spiral keels, two of which are placed com- 

 paratively close together, at the upper part of each volution, and the third 

 at the base. On the outer volution of the type of M. tropidophora the 

 basal carina ultimately becomes confluent with the upper or posterior 

 margin of the lip, on the columellar side. 



EuGMPHALUS iNOENATUS, Whiteaves. 



Plate 13, fig. 1. 

 Trochonema inoriiatum, Whiteavea. 1884. This volume, pt. I, p. 19, pi. 3, fig. 7. 



The specimen from Elora represented on Plate 3 of the first part of the 

 present volume is the only one that the writer has seen, upon which any 

 portion of the test is preserved. The figure of this specimen, however, is 

 not at all satisfactory, and the additional and much more correct illustra- 

 tion upon Plate 13 of the present part of this volume, is drawn from a 

 cast of the interior of the shell, from Durham. In spite of its compara- 

 tively elevated spire, and narrow or perhaps closed umbilicus, the genera) 

 shape and the insinuation of the growth lines on the shoulder of the outer 

 volution, would seem to indicate that this shell is referable to EuomjjJuv- 

 lus rather than to Trochonema. It may prove to be merely an abnormal 

 form of the species next to be considered. 



EuoMPHALUs Galtensis, Whiteaves. 



Euomphcdus Galtensis, Whiteaves 1884. This volume, pt. 1, p. 21, pi. 3, 



figs. 9 and 9 a. 

 Cf r. Euomphalus GotlaJidicus, Lindatrom. .. .IS84:. Sil. Gastr. and Pter. Gotland, 



p. 139, pi. 13, figs. 19-31. 



Gait, E. Billings, 1857; Hespeler, T. C. Weston, 1867 ; and Durham, 

 J. Townsend, 1878-82. 



This species is very closely related to, if not identical with, the H. Got- 

 landicus of Lindstrom. Still, if the two should prove to be identical, E. 



