85 



margin. Surface covered with obscure, rounded, radiating ribs about half 

 a line in width, and with some faint concentric, apparently crenulated 

 striae. 



Of this species only one perfect specimen has been collected. Length, 

 one inch ; width, sixteen hnes ; depth of both valves, seven lines. 

 Associated with it were found broken specimens which indicated a width, 

 of from two to two and a half inches. 



Locality and Formation. — South West Point, Anticosti, Middle Silurian- 



Collector. — J. Eichardson. 



(The following is from the Geological Magazine, vol. 5, February, 1868, 

 with some slight alterations.) 



"In the 'Canadian Naturalist and Geologist/ vol. 4., p. 134, figs. 

 8-9 (1859), I figured a small specimen of a species of Stricldandinia 

 under the name of S. lens; but, at the same time, stated that I was not 

 certain whether it was the true S. lens or a variety. It was more pointed 

 in front than any of the English specimens I had seen. It had been 

 collected in the Middle Silurian rocks on the Island of Anticosti, along 

 with numerous other specimens, most of them in a fragmentary condition. 

 Among these I thought that S. Virata could also be identified ; and thus 

 both of the British species have been cited in several of the pubhcations 

 of our Survey. 



"Through the kindness of the author I received, several months ago, 

 ' Part 2 ' of Mr. Davidson's * Monograph of the British Silurian 

 Brachiopoda.* The clear descriptions and beautiful illustrations of this 

 magnificent work at once enabled me to perceive that we have not (so 

 far as yet known) either of the two species above mentioned. What I 

 supposed to be S. llrata, is the adult of the form figurecx by me as S. lens. 

 The young and small individuals are smooth ; but with increasing size and 

 age they become more and more strongly ribbed. 



" While re-examining the whole collection, with a view to this paper, I 

 broke up several pieces of hmestone, which were almost entirely compose I 

 of the imperfect and detached valves of another species, and succeeded in 

 getting out several specimens, sufi5ciently perfect to authorize a descrip- 

 tion. We have thus two new species ; and, as the error with regard to 

 S. Virata and S. lens has been transferred from my publications into 

 several important English works, it is thought advisable to describe them 

 in the Geological Magazine at once, without waiting for my next 

 report, which cannot be issued for several months." 



