GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE HAMILTON GROUP. 
No. 48. —No. 87, page 
Fig. 1 . Cystiphyllum cylindricum, with Aulopora tubceformis attached. (Lonsdale in Silu¬ 
rian Researches, p. 691, pi. 16 bis, f. 3, 3 a and 3 b.) 
Fig. 2. Cystiphyllum id., a smaller specimen, with the bases of crinoidal columns attached. . 
Eighteen-mile creek. 
Fig. 3. Strombodes heliantlioides? (Phil. Palaeozoic fossils, p. 11, pi. 5. f. 13. Cyatho- 
pluyllum helianthoidum, Goldfuss, Petrefacta, pi. 20, f. 2.) York, Livingston 
county. > 
Fig. 4. Strombodes distortus , H. Moscow. 
Fig. 5. Strombodes? rectus, H. Moscow. 
Fig. 6. Strombodes simplex ? H. This fossil resembles the S. plicatum, but is apparently 
distinct. 
No. 49. 
Fig. 1. Cyathophyllum {Strombodes ?) turbinatum? (Goldfuss, p. 56, pi. 16, fig. 8.) York, 
Livingston county. 
Fig. 2 and 2 a. Strombodes - ? A young individual. York. 
Fig. 3 and 3 a. Cyathophyllum - ? A rare but strongly marked species. Moscow. 
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