DiPH. 



204 



The description given by Hall (35th Annual Report of the 

 New York State Museum, 1884, page 458) is ''- Corallum simple, 

 sub- cylindrical, straight or curyed, gradually or more rapidly- 

 expanding ; when decorticated presenting a distinct invaginated 

 appearance ; len gth of one individual 60 mm. ; calix bell-shaped, 

 diameter 20 mm., depth 10 mm.; number of lamellae from 60 

 to 70, of nearly uniform size at the margin, alternating below, 

 the principal ones extending to the vertical internal wall ; den- 

 ticulations prominent, 10 in the space of 5 mm. ; inclosed in- 

 ternal area oval or horse shoe-shaped, from 4 to 6 mm in diam- 

 eter, anterior side indented by a deep, narrow fossette. — For- 

 mation and locality. Corniferous limestone. Falls of the Ohio. 

 — Villa:' 



Diphyphyllum archiaci. Billings. Collett's Indiana Re 



VIII c. 



Ind./BHI 



port of 1881, page 387, plate 50, fig. 1, side of corallum and 

 upper ends of corallites cut off. Hamilton in Canada. (Found 

 in all the Devonian strata of Indiana. CoUett. ) — VIII g. 



