OF DENISON UNIVERSITY. 
41 
with numerous (20-28) rounded plicae, broad fold with six or seven 
plicae, and the sudden fiexture of the front and lateral margins. The 
species ranges through the middle Waverly. 
Several other species could be recognized, but it is feared that a 
larger collection would obliterate the distinctions assumed. 
Atrypa reticularis, ? ? 
(Plate III, Fig. 1 1. ) 
Small specimens resembling this species have been obtained from 
the upper free-stone, lower part of division III. The identification is 
doubtful, though undoubted specimens said to have been derived from 
the Waverly are in the museum of Ohio Slate University. 
Genus Syringothyris, Winchell. 
{Syringothyris cuspidatus, Martin. 
(Plate I, Fig. 7, (?) ; Plate II, Fig. 17 ; Plate V, Figs. 4-7.) 
Af^omifes cuspidatus, Martin, 1796. 
Spin fer cuspidatus, Sowerby, 1809. 
Davidson, 1857. 
Cyrtia simplex, McCoy, 1884. 
Cyrtia cuspidata, McCoy, 1855. 
7 Spirife7^ capax, Hall, 1858. 
Spiidfer caideri. Hall, 1857. 
Syringothyris typa, Winchell, 1863. 
Spirifer textus. Hall, 1857. 
Spirifer hannibalensis. Swallow. (?) 
It seems to me after a careful collation of the descriptions above 
quoted and the comparison of several hundred specimens that a due 
conservatism will unite all the supposed species and identify them, as 
positively done by Davidson and Dekoninck, the most careful Euro- 
