GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE HAMILTON GROUP. 



No. 48. — No. 87, page 



Fig. 1. Cystiphyllum cylindricum, with Aulopora tubaformis 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 helianthoides? (Phil. Palaeozoic fossils, p. 11, pi. 5. f. 13. Cyatho- 

 phyllum 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 ? EL This fossil resembles the S. plicatum, but is apparently 

 distinct. 



No. 49. 

 Fig. 1. Cijathophyllum (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. 



43 



