212 



linear area of brachial valve; slightly incurved beak; 

 well-marked mesial fold and sinus; simple surface plications; 



.'— ▼**••.. 



Fig. 119. Spirifer audaculus. Dorsal and frout view of a specimen ; dorsal and ven- 

 tral views of another specimen, with a higher area and more projecting ventral beak (from 

 Hall). 



numerous, often imbricating, concentric lines, and fine 

 radiating stria 1 . 



Found in the lower Moscow shale, at Sections 4 and 5 

 (rare); also var. eatoni; Encrinal limestone, at Section 5 

 (common); Stictopora and Demissa beds, at Section 5 

 l abundant); four feet below the Encrinal limestone, at Sec- 

 tion 6, etc. (rare): shales between the Trilobite beds, at 

 Section 8 3 and on the Lake Shore; Pleurodictyum beds, in 

 Avery's Creek, and on the Lake Shore. 



Spirifek audaculus, var. eatoni. Hall. (Fig. 119A.) 

 ( Pal. X. Y.. Vol. [V.,p. 229, PL XXXVIII.) 



Distinguishing Characters. — Robust, extremely convex 

 and resembling a small S. granulosus, but without the 

 granules. 



Found in the lower Moscow shale, at Section 5, coral 

 layer. 



