198 



Septa approximated, from twenty to twenty-two in the whorl near- 

 est to the aperture : mai-gins of the septa, as seen on the cast, slightly 

 flexuoiis, gently convex next the nrabilical perforation, concave on and 

 towards the outer half of the sides, and straight or slightly convex on 

 the periphery. Sij)huncle nearly central, but placed a little on the 

 inner side of the centre of each septum. 



Exact localities : Skidegate Inlet one mile and three-quarters south- 

 west of Welcome Point, and Bay cast of Alliford Bay. 



Genus Spiroceras, Meek. 



Rejjort on the Invertebrate Cretaceous and Tertiary Fossils of the Upper 

 Missouri Country. Washington, 1876. Pages 485 and 486. 



Shell somewhat resembling that of Helicoccras, as typified by H. 

 annulatum, d'Orbigny, but dilfering therefrom in " its more closely 

 coiled volutions, more produced spire and particularly in consequence 

 of having the costse that cross its siphonal side, with nodes placed 

 between them, so as to form three longitudinal rows along this outer 

 surface." " It is also much larger and more robust than d'Orbigny's 

 types of Helicocerasy Type of the genus, Turrilites Robertianus, 

 d'0rbign3^* 



Spiroceras Carlottense. (N. Sp.) 



Shell ajDparently either sinistral or dextral, large, the largest frag- 

 ment known, which consists of nearly the whole of one volution, being 

 at least six inches in diameter. Cavit}^ in the centre of the whorls, 

 which corresponds to the umbilical perforation, equal to about one- 

 third of the entire breadth of the base : outline of aperture nearly 

 circular. Outer surface of the later whorls marked by transverse 

 rows of broad, low, rounded tubercles or nodes, which alternate with 

 two simple ribs. In each of the transverse rows there are four 

 tubei'cles or nodes, one above and three below the siphuncle. The 

 simple ribs which alternate in pairs with each row of nodes are trans- 

 verse also, but they curve back slightly in passing over the siphuncle. 

 In a fragment which probably belongs to this species and which con- 

 sists of portions of two of the earlier whoi-ls, the rows of tubercles are 

 represented by rows of conical spines, which latter are about two lines 

 in height. Septum unknown. 



North shore of Cumshewa Inlet: two lai-ge septate fragments, each 

 consisting of nearly an entire whorl, but both so badly water worn 



* Palcoutologie Franjaise. Terrains Cr^taefe, vol. 1, page 585. Atlas, plate 142. 



