OF DENISON UNIVF.RSITY 47 



Spirifer? hirtus, ^^ aiul W ? 

 (Plate III, Fig. 2.) 



A single dorsal valve may represent this species. A similar form 

 from the Cuyahoga shale has been referred by collectors to S. seligera, 

 H. The existence of such an Athyris-like form is of interest even though 

 some doubt must prevail as to the specific relations. To the student 

 of evolution the series beginning with the Devonian and including .V. 

 fimbnata, S. prematura, S. pseudolineatus, S. scfigera, S. lineata. etc 

 should be interesting. 



Cyrtina, sj). 



(Plate VIII, Fig. 18.) 



A small species is known from a ventral valve found in calcareous 

 nodules at the base of the Licking Co. section at Moot's run, four and 

 one-half miles west of Granville Height 4 mm ; width 5 mm ; con- 

 vexity 2 mm; beak slightly incurved; sinus narrow, rather deep: 

 about seven plicae on either side. Our form is less elevated than C. 

 acutirostris, Shumard, resembling S. hamiltonensis, but with a nar- 

 rower sinus. 



Spiriferiiui solidiro'^tris, Wl^'te. 

 (Plate II, Figs. 9-1 1 ; Plate V, Fig. 13.) 



This pretty little shell is common in a layer of free-stone several 

 feet above congl. II, at Newark. All specimens so far collected are 

 very small and are characterized by the high incurved beak of the 

 ventral valve and the regular concentric striae, which in well preserved 

 specimens cross the {<i\\' plications. The dorsal valve is rather flat, 

 with a small beak and 7-9 rather large folds separated by deep, but 

 not wide grooves. The median fold is flattened or even channeled 

 above. 



Spiriferifift (Irpressa. ^p- "• (?) 

 (Plate 10, Fig. 3. ) 



Shell of large size, valves nearly ecpially convex, transverse, the 

 hinge-line equal to the greatest width. 



Ventral valve wider than high, moderately convex, beak incurved. 



