OF DENISON UNIVERSITY. 
3 ^ 
Crania Jiamiltoniae, H. (?) 
(Plate XII, Fig. iq. ) 
This little species is found adhering to mollusks and brachiopod 
shells and is largely modified by the ornamentation of its host. Our 
specimen agrees as fully as might be expected with the smaller varie- 
ties of the species quoted. 
Broadly oval or sub-circular ; dorsal valve sub-conical ; apex sub- 
central or excentric, pointed, surface marked by very fine (scarcely 
lamellose) striae. Lower valve not seen. Concretionary layers at 
Moot’s run — lowest fossiliferous horizon. 
This species, whether specifically identical with C. hamiltoniae or 
not, has a decided Devonian aspect. 
Procluctus Jfehrascensis, (?) 
(Plates I, Fig. 24; III, 2^(?) 2^a.) 
vT/ 
Specimens having the characters of this species are widely distrib- 
uted. Though never attaining a very large size there is a considera- 
ble range of variation in this respect as well as in outline and form. 
The rather regular and prominent pustules are sufficiently characteris- 
tic. The species is known from the horizon of congl. I, to the top, but 
may descend lower. 
Product as semireticulatus. 
(Plates I, Fig. 26; III, 24; VII, Fig. 11; X, 6, 6a.) 
This widely distributed species is especially characteristic of the 
uppermost Waverly, as found at the tank north of Newark and in the 
freestone. The species attains a large size and may be recognized by 
the great prominence of the ventral valve near the strongly incurved 
beak. 
Proclactas arcuatus, Hall. 
( Plate III, Fig. 18. ) 
Prof. Hall’s description runs as follows: 
“Ventral valve much elevated, longer than wide, very gibbous, 
