96 



SUBULITES VENTRICOSUS, Hall. 



Subniites ventricosa, Hall 1852. Pal. N. York, vol. II., p. 347, pi. 83, figs. 



7, a-b. 



Billings 1863. Geol. Canada, p. 339, fig. 346. 



Nicholson... 1875. Rep. Pal. Prov. Ont., p. 71, pi. 3, fig. 5. 



Gait, A. Murray, 1847, and E. Billings, 1857 ; Elora and Durham, J. 

 Townsend, 1878-82 ; Hespeler, Nicholson. 



SuBULiTES COMPACTUS, Whiteaves. 



Suhxdites compaetm, Whiteaves. .1884. This volume, pt. 1, p. 16, pis. 3, fig. 2, and 



7, fig. 6. 



This species was originally described from a single specimen collected 

 at Durham, and there are now three other typical examples of it in the 

 Museum of the Survey, one from Hespeler, one from Elora and one from 

 Durham. Its principal characteristics are the slender, subfusiform con- 

 tour of the shell, and the nearly cylindrical shape of the somewhat con- 

 stricted outer volution, which is usually a little narrower than the one 

 that immediately precedes it. The larter volutions of the spire, too, are 

 generally much broader than high. 



SUBULITES COMPACTUS ? Var. 



Plate 14, figs. 4 and 5. 



Six specimens of a small Subuhtes, collected by Mr. Townsend at Dur- 

 ham and now in the Survey Museum, differ from the type of S. campactus 

 in the following particulars. They are still more slender in shape, not 

 most tumid at the mid-length, and the outer volution of each is scarcely 

 contracted but gently convex, a little more so than the one which precedes 

 it. The last volution of the spire and sometimes the last but one, are 

 usually higher than broad. It is doubtful whether these specimens (two 

 of which are figured) should be regarded as a mere variety of S. compac- 

 tus, or as a distinct species. 



Opercula 

 of unknown genera and species. 



A. Paucispiral opercula. 



Plate 14, fig. 6. 



A few paucispiral opercula, like those of resent species of Natica or 

 Littorina, were collected by Mr. Townsend at Durham in 1884 and 1885. 



