403 



minent, acute raised ribs, which extend from the beaks to the anterior 

 margin. 



"Sucia Islands, J. Richardson, 1874, one rather small but perfect speci- 

 men and two single valves ; and Dr. C. F. Newcombe, 1894, ?ix single 

 valves." 



The largest of these specimens, it may be added, is not quite seventeen 

 millimetres in its maximum diameter, and it is now obvious that none of 

 them are quite full grown. 



A few badly preserved specimens of a Rhynckonella, which are probably 

 referable to this species and which are now in the Museum of the Survey, 

 were collected at three different localities on Vancouver Island in 1901. 

 Four of these are from Brennan Creek, where they were collected by the 

 Rev. G. W. Taylor. The largest of them is the original of figures 3 and 

 3 a on Plate 51. It is transversely subelliptical, wider than high, about 

 25 "5 mm. wide by 20 5 high, and has upwards of thirty ribs. In this 

 specimen and in another apparently adult shell from the same locality, 

 there is no mesial fold or sinus. One small specimen, about 10 mm. long 

 and slightly longer than wide, with very fine ribs, from Departure Bay, 

 and another, a little larger and rather more coarsely ribbed specimen, 

 from the roof of the coal at the New Vancouver Coal Company's mine, 

 were collected by Mr. Harvey. 



A crushed specimen of a Rliynchonella from Tucker Bay, Lasqueti 

 Island, collected by Mr. Harvey in 1901 and now in the Museum of the 

 Survey, is probably only a rather coarsely ribbed variety of R. Suciensis. 

 It is 20'5 mm. long by 20 broad, and has only fifteen or sixteen ribs. 



Terebratella Harveyi. (N. Sp.) 



Plate 51, figs. 5 and 6. 



Shell inequivalve, minutely punctate, subcircular or somewhat fan- 

 shaped, rounded in front and at the sides, but bluntly pointed behind. 



Ventral valve deeper and a little larger than the dorsal, its umbo mo- 

 derately prominent or produced, and its surface marked with from twelve 

 to fourteen simple or bifurcating ribs or rib-like folds, and concentric 

 lines of growth. The beak, or apex of the umbo, and the foramen and 

 area of this valve are not preserved in any of the specimens that the 

 writer has seen, but a cast of the interior of a ventral valve shews a trans- 

 verse constriction of the umbo, and a narrow divergent groove or slit on 

 each side of it. 



Dorsal valve nearly flat, -oS cardinal border straight, its beak very small, 

 and its surface ornamentation similar to that of the ventral. A cast of 



