362 



Extension mine, near Nanaiino, V. I., W. Harvey, 1901 : the speci- 

 men figured, which is twelve millimetres long and imperfect at both ends, 

 and a fragment of another. These specimens seem to differ from C. 

 Ski'iegatense in their larger size, more slender spire, and spirally elon- 

 gated tubercles, but they may represent only a large stratigraphical and 

 geographical variety of that species. In the original description of C. 

 Skidegatense, in the third part of this volume, no mention is made of any 

 ribs. Yet of the five specimens from Maud Island upon which the species 

 is based, two shew that all the volutions of the spire are crossed by 

 transverse and straight ribs, that become obsolete and disappear on the 

 lower half of the outer volution. 



Cerithium Harveyi. (N. Sp.) 



Plate 43, fig. 7. 



Shell elongates^, more than twice as long as wide ; volutions about 

 seven, those of the spire obliquely compressed laterally, and pentagonal 

 in transverse section ; outer volution moderately convex, widest at 

 or a little above its midheight, as viewed dorsally, and abruptly nar- 

 rowing into the channeled base anteriorly ; characters of the aperture 

 unknown. 



Surface marked by distant variciform ribs, that cross the volutions 

 transversely, with broad nearly flat or shallowly concave spaces between 

 them, and by small beaded or minutely tuberculated spiral ridges. On 

 the last volution but one there are four of these beaded spiral ridges, and 

 on the last there are six spiral ridges and five variciform ribs. These latter 

 are nearly or quite opposite on three or four of the volutions, and are 

 continuous longitudinally for the greater part of the length of the 

 specimen. 



Roof of coal. New Vancouver Coal Co.'s mine, Nanaimo, W. Harvey, 

 1901 : two specimens, one, which is somewhat crushed, not very well 

 preserved and slightly imperfect at both ends, being twenty-four milli- 

 metres in length by ten millimetres in breadth ; while the other, which is 

 figured, is more perfect and better preserved, being about thirteen milli- 

 metres long. 



The writer has much pleasure in associating with this species the name 

 of its discoverer, Mr. Harvey, whose long continued exertions have added 

 so many novel forms to the fauna of the Vancouver Cretaceous. 



