241 



This singular shell, whose characters cannot bo very satisfactorily 

 detinod with the material at the writer's disposal, appears to belong to 

 that section of the genus of which Inoceramus alatus, Goldfuss,* is the 

 type. Judging partly by the figure in the " Petre facta Germania'," 

 and parti}' by the description (" costis conceutricis crassis regularibus") 

 it would seem that the /. alatus has much broader and more regidai-ly 

 disposed concentric folds than the present species. 



Inoceramus concentricus, Parkinson. 



For the synonymy of this well known species, see page 19 of the 

 present volume. 



North shore of Cumshewa Inlet, one specimen : Hkidegate Inlet, at 

 Bear Skin Bay (one specimen), and very abundant at South Island, 



Inoceramus (Actinoceramus) sulcatus, Parkinson, 



Plate 32, figs. 3 & 3a. 



Inoceramua concentricus, Parkinson. — 1820. Transactions of the Geologi- 



cal Society of London, Vol- 5, 

 p. 59, pi. 1, fig. 5. 



" " Sowerby. —1821. Mineral Conchology, pi. 306, 



figs. 1-5. 



" " Goldfuss. — 1836. Petrefacta Germanise, page 



112, pi. 110, fig, 1. 



" " d'Orbigny. — 1845, PaMontologie Frangaise, 



Terrains Cr^tac6s, Vol, 3, p. 504, 

 pl, 403, figs. 3-5. 

 Pictet & Campich^.— 1869-71. Pal^ontologie Suisse, 

 Fossiles de Sainte Croix, Vol. 4, 

 p. 105 ; which see for a more 

 extended synonymy of the 

 species. 



Very abundant at and around Bear Skin Baj^, on the Graham Island 

 side of Skidegate Inlet, where thirty-eight good specimens were col- 

 lected. 



In describing this species d'Orbigny says (op. cit. p. 504) that it has 

 seven or ten radiating ribs, but in the Queen Charlotte Island speci- 

 mens collected by Dr. Dawson the maximum number of i-ibs is from 

 seven to eight, there are frequently only three and sometimes they are 

 almost obsolete. Pictet, however, in speaking of the ribs of this shell 



* Petrefacta Germaniae. Vol. 1, Divisio Quarta, p. 116, pl. 112, fig. 3. 



