GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE CLINTON GROUP. 
No. 7 
Fig. 1 . Orthonata curta, H. 
Fig. 2. Nucula machcerceformis, H. 
Fig. 3. Cypricarclia obsoleta, H. 
Fig. 4. Nucula mactrceformis, H. 
Fig. 5. Avicula leptonota, H. 
Fig. 6. Cypricardia? angusta, H. 
Fig. 7. Lingula elliptica, H. 
Fig. 8. L. oblata, H. 
Fig. 9. L. acutirostra, H. 
No. S. —No. 17, page 72. 
Fig. 1 . Stropliomena elegantula,H. Shell with elevated ribs and fine stria? between. It bears 
a considerable analogy to S. sericea and S. transversalis , but is quite distinct 
from either. Sodus Point. 
Fig. 2. Stropliomena cor rug ata, C. (Jour. Acad. Nat. Science, Vol. 8, p. 256, pi. 14, fig. 8.) 
Rochester. 
Fig. 3. S. cornuta, H. A small neatly striated shell, armed with small rigid spines on the 
hinge line. Sodus Point. 
Fig. 4. Atrypa hemispherica, (Silurian Researches, pi. 20. fig. 7.) Abundant in the green 
shale at Rochester. 
Fig. 5. Littorina cancellata, H. Young shell. Sodus Point. 
Fig. 6. — — “ Old shell, with the markings worn off. 
Fig. 7. Posidonia? alata, H. Green shale, Rochester. 
Fig. 8 and 8 a. Atrypa affinis ? Old and young shells. Sodus Point. 
Fig. 9. Calymene ? trisulcata, H. A small trilobite, with three furrows on each side of the 
middle lobe of the head. Rochester. 
Fig. 10. Agnostus latus. Green shale, Rochester. 
Fig. 11. Tentaculites minutus. 
Fig. 12. Graptolites Clintonensis. An abundant form in the upper green shale of the group. 
Sodus Point. 
No. 9. — No. 19, page 77. 
Fig. 1 . Fucoides biloba, Vanuxem (Geological Report, page 79). 
Fig. 2. Tail of Hemicrypturus. “ “ 
Fig. 3. Smooth crinoidal joint. “ “ 
Fig. 4. Lingula oblonga, C. (Annual Geol. Report, page 65.) 
L. Clintoni, Vanuxem (Report, page 78). 
Fig. 5. Stropliomena depressa. (Leptcena depressa, Dalman.) 
.—No. 18, page 7G. 
-Shale of the Wolcott ore bed in Wayne county. 
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