198 



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

 est to the aperture : margins of the septa, as seen on the cast, slightly 

 flexuous, gently convex next the umbilical perforation, concave on and 

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

 the periphery. Siphuncle 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 east of Alliford Bay. 



Genus SPIROCERAS, Meek. 



Report on the Invertebrate Cretaceous and Tertiary Fossils of the Upper 

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



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

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

 coiled volutions, more produced spire and particularly in consequence 

 of having the costa) 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 Helicoceras." Type of the genus, Turrilites Robertianus, 

 d'Orbigny.* 



SPIROCERAS CARLOTTENSE. (N. Sp.) 



Shell apparently 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. Cavity 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 

 tubercles 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 whorls, 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 large septate fragments, each 

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



* Paleontologie Fran ? aise. Terrains Cretans, vol. 1, page 585. Atlas, plate 142. 



