Fossils of the Chazy Limestone, 431 



Brachiopoda. 23 Species. 



Lingula Lyelli. (Billings.) 



This species was published among the Calciferous Sandrock 

 Fossils in the last number of the Canadian Naturalist and Geolo- 

 gist. At the time I prepared the article for the press, both Sir 

 W. E. Logan and Mr. Richardson were absent. On their return, 

 they informed me that upon strati graphical evidence, they con- 

 sidered the conglomerate sandstones at the Allumette Rapids to be 

 of the age of the Chazy. Afterwards, while examining a collec- 

 tion of Chazy fossils collected by Mr. Bell near L'Orignal during 

 the present season, I found several specimens of L. Lyelli associ- 

 ated with abundance of Rhynconella plena , and also phosphatic 

 nodules like those of the conglomerate sandstone. There can 

 be no doubt but that the Allumette sandstone belongs to the 

 Chazy formation. Lingula Lyelli must therefore be removed 

 from the Calciferous fauna. 



Lingula Belli. (N.s.) 



,,, i _ r;: , ... 



Fig. 7. Fig. 8. 



Fig. 1. — Lingula Belli. One of the forms of this species. 



8 — " A convex form. 



(In both figures the longitudinal lines represent shading.) 



Description. — Oval, apical angle about 75°, lateral margins 

 somewhat straight or gently convex for two thirds of the length, 

 front ano-les and anterior margin broadlv rounded, length one 

 fourth or one third greater than the width ; greatest width, at 

 about one third the leno-th or a little less from the front. Lar^e 

 specimens are one inch long and nine lines wide, but the usual 

 size is one third smaller. 



The form so far as regards convexity of the valves is somewhat 

 variable. In general the specimens are strongly convex, or very 

 obtusely carinate from the beak to near the centre of the shell, 

 and have three flat slopes, one to each of the lateral margins and 

 one to the front. The most prominent point is a little above the 

 middle, and the anterior slope is always larger than the others. 

 From this form, which is that of a very low three sided pyramid, 



