DEVONIAN ROCKS OF CANADA WEST. 123 



differs in the edges of tlie septa, wMcli are not dentated as in tliat 

 species. 



Locality and formation. — Devonian; Corniferous limestone. Ex- 

 tremely abundant at Eama's Farm near Port Colborne, Canada 

 West. 



Zaphrentis spatiosa — (Billings). , 



Description. — Corallum short, turbinate, moderately curved and 

 very broadly expanding. At the margin of tlie cup about ninety 

 radiating septa alternately a little unequal an i with, their edges 

 broadly rounded as in Z. prolijica. Length measured on the side of 

 the greater curvature, about three inches, width of cup two inches 

 and a half. Septal fossette unknown. 



This species is closely related to Z. prolijica, and may perhaps be 

 united with it when its characters become more fully known. 



Locality and formation. — Devonian, Onondaga and Corniferous 

 limestone, Eama's Farm, near Port Colborne, Canada "West. 



Genus Amplexus. — (Sowerby.) 



Generic characters. — Same as Zaphrentis, but with the radiating 

 septa rudimentary, and extending but a short distance from the outer 

 wall. 



Amplexus tandelli. — (Edwards and Haime.) 



Amplexus yakdelli. Edwards and Haime. Polypiers Mssiles, p, 



3M, pi. 3, fig. 2, 2 a. 



Corallum long, cylindrical, curved, gradually enlarging from the 

 small pointed base to the cup, which has a variable diameter of from 

 three fourths of an inch to one inch and a half, at a length of six 

 inches. Surface strongly marked with from forty-five to sixty -five 

 angular septal ridges, which are crossed by numerous small encircling 

 strise, and larger grooves or folds of growth. Of the smaller striss 

 there are four or five in one line, and they are often sufficiently strong 

 to give the surface a sub-reticular appearance. The septa extend 

 from about half a line to two lines from the outer wall ; they are al- 

 ternately large and small. The transverse diaphragms are either flat 

 or flexuous. Edwards and Haime have figured a well developed 

 septal fossette. 



Locality and formation. — Near "Woodstock, Corniferous limestone 5 

 also at the falls of the Ohio. 



