87 



StricldancVinia Davidsonn differs from S. Jens, m being more 

 narrowed in front, more strongly ribbed, and in having the area concealed 

 when the valves are in their natural position. Notwithstanding the variable 

 form of the shell, there are none, in a collection of nearly a hundred 

 specimens, that could be considered specifically identical with any of those 

 figured by Mr. Davidson in the ' Monograph,' pi., xix. figs. 14-21. But 

 there is a dorsal valve from the Niagara limestone of Cabot's Head, Lake 

 Huron, ex^jeedingly like fig. 13. It is, however, quite distinct from 

 S. Dacidsonii^ and I think from S. lens also. 



" As before stated the large individuals often have the ribs strongly 

 developed, and curved out to the sides. They thus closely resemble the 

 figure of 5. Urata in * Sil. Syst.," pi. xxii, fig. 6. Indeed, I could very 

 nearly re-produce that figure from some of our broken specimens. It is 

 these that I thought could be identified with S. Urata. The small smooth 

 ones I supposed to be S. lens; but, after seeing Mr. Davidson's figuies, 

 I re-examined the whole collection, and found that there is a gradual 

 passage from the smooth to the strongly ribbed. The specimen figured 

 (figs. 1-1 c) is about as perfect as a fossil can be, and is a good example 

 of an intermediate form. 



This species is dedicated to Thomas Davidson, Esq., F.R.S., F.G.S., 

 &c., author of numerous pubHcations on the fossil Brachiopoda. 



Locality and Formation. — " This species occurs at a number of localities 

 around the coast of the Island of Anticosti, from Jupiter River to East 

 Pointc It is most abundant at South-west Point, where the specimen 

 figured was collected. It is associated with Stropliomena rhomhoidalisj 

 S. peden^ S. antiquata, Leptoena transversalis, Orthis Davidsoniiy 

 Pentamerus, ohlongus. Spirifcra p)licatella, Leptocoelia {Atrypa) hemis- 

 jjherica Atrypa reticularis^ and many others mostly new specie^!. The 

 rocks belong to the Anticosti group, division 3, a horizon which is very 

 nearly, if not exactly, that of the Upper Llandovery rocks. It also 

 abounds on the mainland at the Schickschock Mountains, on the south side 

 of the St. Lawrence, about 250 miles easterly from Quebec. I have 

 never seen a specimen from any other part of America." 



Collector. — J. Richardson. 



Stricklandinia Salterii. (Billings.) 



Plate, 7, fig. 1. 



Description. — " Shell transversely oval ; width greater than the length ; 

 sides and front usually rounded, but o.:en with an obscure linguiform 

 extension. Hinge-line nearly as wide is the shell, straight and a little 



