204 



Size. Length of the ventral valve, 8 mm. ; width, 6 mm. The dorsal 

 valve is nearly 1 mm. shorter than the ventral. 



Horizon and locality. In the fine dark gray shales of Div. 3c, at 

 McLeod brook, Boisdale, N.S. Scarce. 



Not the same Mr. Walcott has referred this species to his 0. (L.) bellus* which was 

 bellus published without figures. I may say, however, that I have compared 



it with Walcott's species, and find that it is smaller, has finer growth 

 lines, and they are more sharply defined on the surface. 



LINGDLELLA, cf. L. LEPis, Salter. 



cf. Lingulella lepis Salt. mem. Geol. Surv. Great Britain, vol. iii, p. 538, 



fig. 11. 



Lingulella A species which by its size and sculpture appears to agree with this, is 



cf Itii >is 



common in the Dictyonema shales both in Cape Breton and in southern 

 New Brunswick ; it is also found in the beds below this horizon, for 

 in the assises 3a and 36 in the St. John basin, are many examples of 

 similar shells, but they are so distorted and flattened as to be unrecog- 

 nizable. 



LINGULELLA RADULA, var. ASPERA n. var. PL XV, figs. 2 a to d. 



Lingulella Mingled with the shells of L. radula in the flags of Div. 2c at Courtney 



description of. b av > St. John, N.B., are the valves of a smaller species, which in the 

 description of the fossils from that locality was spoken of as a variety of 

 that species.f It appears to agree in form, size and markings with a 

 small species from the flags of Mira river, Cape Breton, which is here 

 described. 



A small ovate species, ventral rather flat, dorsal tumid. 



The ventral has an acute projecting beak, but elsewhere the relief is 

 flattened, and gently sloped to the margin. Interior. An example 

 partly exfoliated shows a strong pedicle groove and rather high area. 

 The cast of the interior exhibits a thickened visceral callus extending 

 less than half of the length of the valve, with impressions of the central 

 muscles about two fifths of the length of the shell from the apex. Faint 

 imprint of the vascular trunks are traceable, extending to one quarter of 

 the length of the valve from the front. 



The dorsal valve is strongly convex, and has flattened margins on the 

 under side. Interior. The cardinal area is rather high, being about one 



* Proc. U. S. Nat. Mus., vol. xxiii, p. 685. 



f Trans. Roy. Soc. Can., vol. viii, sec. iv, p. 148. 



