371 



Nanaimo River, V.I., below the coal, W. Harvey, 1901 : one fine speci- 

 men which, however, has a considerable portion of its surface worn and 

 partially eroded. It seems to differ from the typical //. giganteus only 

 in the much more feeble development of its radial ribs. 



As already stated, it is quite likely that the thi'ee fossils from the 

 Comox River described provisionally on pages 364 and 36o as Capuhis 

 corrugatus, may prove to be very young specimens of this variety of 

 Helcion gigantaus. 



Helcion tenuicostatus. (N. Sp.) 



Plate 45, figs. 8 and 8 a. 



Shell small, depressed conical, not more than one-half as high as wide, 

 apex apparently erect, obtuse, placed in advance of the midlength, and a 

 little to one side, aperture broadly oval. 



Surface widely but rather faintly undulated concentrically, and marked 

 by very numerous, narrow, prominent, acute and slightly tlexuous, 

 radiating ribs. 



Approximate dimensions of the specimen figured : length sixteen 

 millimetres; width or breadth, twelve mm. ; maximum height, .six mm. 



Extension mine, near Nanaimo, V.I., nine specimens ; and Texada 

 Island, two or three specimens : all collected by Mr. Harvey in 1901. 



This finely ribbed little limpet seems to differ from the Helcion granu- 

 latusoi Stanton,* from the Knoxville beds of California, in its proportio- 

 nately greater height, and in the apparent absence of the " rather closely 

 arranged, impressed concentric lines" said to be characteristic of that 

 species. 



Genus and species uncertain. 



Plate 45, fig. 9. 



. Six well preserved but somewhat crushed and very imperfect speci- 

 mens of the shell of a small gasteropod, that the writer has not been able 

 to refer satisfactorily to any known genus, were collected from the roof 

 of the coal at the Nanaimo mines by Mr. Harvey, in 1901, and are now 

 in the Museum of the Survey One of these has only a single volution 

 preserved : four, including the one figured, the outer volution and one or 

 two of the preceding ones; and one, part of four volutions of the spire. 

 Their sculpture consists of very numerous and close-set, fine striae of 

 growth, and a few irregulary disposed, and more or less minute spiral 

 ridges. 



* Bulletin of the U. S. Geological Survey, No. 133, p. 63, pi. xii, fig. 4. 



