355 



This is a much smaller species than the 2'. cylindraceus ? (or T. Skide- 

 gatensis) of the Cretaceous rocks of the Queen Charlotte Islands, with a 

 distinctly step-shaped spire, and very minute ribs that evanesce on the 

 outer volution anteriorly. 



Zittel, in his ' Handbuch der Palseontologie,' regards TrochactcBon, 

 Meek, as a synonym of Actoeonella, d'Orbigny, and Dr. Paul Fischer, in 

 his Manuel de Conchyliologie, says that it indicates a mere section of 

 that eenus. 



SuRCULA (raricostata ? var.) Hornbyensis. 



Surcula raricostata, Gabb, var. Whiteaves. 1879. This volume, pt. 2, p. 116, pi. 15, 

 tigs. 2 and 2 a. 



The five specimens from Hornby Island that are referred to in the 

 second part of this volume as a variety of S. raricostata, are probably 

 distinct therefrom, and it seems desirable to distinguish the Canadian 

 from the Californian specimens by a local and at least varietal, if not 

 specific name. 



Bela cretacea. (N. Sp.) 



Plate 44, fig. 6. 



Shell small, angularly subfusiform, and about twice as long as wide, 

 spire shorter than the outer volution ; whorls five, the third and fourth 

 obliquely compressed above, laterally compressed below, and subangular 

 at about their mid-height; the outer one moderately convex, obliquely 

 compressed next to the suture, subangular and most prominent consider- 

 ably above its mid-height, thence tapering abruptly and rapidly into 

 the narrow, nearly straight and channeled base. 



Surface marked with flexuous nodose ribs and raised lines of growth, 

 that cross the volutions transversely and run parallel with the outer lip, 

 also by numerous, close-set, minute and rounded spiral ridges. The ribs 

 are most prominent and distinctly nodose on the spiral angulation or 

 shoulder of the later volutions, and the nodes, when examined with a 

 lens, are seen to be obtusely conical and laterally compressed. 



Hornby Island, W. Harvey, 1895 : two specimens, both of which are 

 now in the Museum of the Survey. The figured specimen, which is the 

 more perfect of the two, is about ten millimetres in length. 



