PORTAGE GROUP. 
245 
The specimens illustrated in the following woodcut occur in the more central or higher 
part of the group, being unknown in the Cashaqua shale, except No. 9. 
107. 
1. Delthyris ]®vis. 
2. Cardium ? vetustum, 
3. Orthis tenuistriata. 
4. Lucina? return. 
5. Nucula lineolata. 
0. Astarte subtextilis, 
7. Bellerophon striatus. 
8. Goniatites bicostatus, 
9. Goniatites sinuosus. 
1. Delthyris Icevis, n. s. — Somewhat semicircular; surface smooth, or with scarcely 
perceptible concentric lines, and sometimes a few strong folds near the margin ; mesial fold 
moderate, strongly impressed in front; beak prominent; cardinal area moderate; foramen 
partially closed. 
This is the only fossil of the genus seen in the district, which is destitute of ribs. It is 
apparently limited in its range, being unknown beyond the borders of Seneca and Cayuga 
lakes. The fossil is often much larger than the figure. 
Localities —West side of Cayuga lake ; Shore of Seneca lake. 
2. Cardium? vetustum, n. s. — Somewhat triangular; slightly carinated upon the posterior 
slope; ribs plain. 
This fossil occurs in the soft green shale, usually presenting an obliquely triangular figure. 
Localities —Cashaqua creek ; Genesee river ; Shore of Lake Erie. 
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