244 



Report of the State Geologist. 



Genus Orthoceras, Breynius. 



9. Orthoceras subulatum, Hall. 



1879, Hall, Pal. K Y., vol. 5, pt. 2, p. 283, pi. 38, 84, 86. 



This species is represented by a single specimen from the Encrinal lime- 

 stone, and by two crushed specimens from the upper Moscow shales (2 ft. 

 below the top). Another crushed specimen similar to the last was found three 

 feet below the Encrinal limestone. Other specimens in a crushed condition, and 

 showing the rapid tapering of this species occur in the Strophalosia bed about 

 fifty feet below the Encrinal limestone. No siphuncle has been observed in 

 these specimens. The distance between the sutures is about 3 mm. 



10. Orthoceras nuntium, Hall. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 299, pis. 43, 82. 



This species is represented by a number of fragments from the Trilobite 

 beds. In the majority of specimens the shell is preserved, showing the fine 

 longitudinal striae. The species appears to be characteristic of these beds 

 occurring in them wherever they are exposed. A single fragment has been 

 found outside of the Trilobite beds. This was obtained in the shale two 

 to four feet below the lowest Trilobite bed at Avery's creek. 



11. Orthoceras Telamon, Hall. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 291, pi. 85. 



A few fragments from the Encrinal limestone are referred to this species. 

 The septa are distant 5 mm. where the diameter of the shell is 11 mm. 



12. Orthoceras exile, Hall. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 290, pi. 39, 84, 85. 



In the Strophalosia bed occur a number of compressed specimens show- 

 ing the constriction of the living chamber and other characters of this species. 

 The living chamber is usually uncompressed. The distance between the 

 sutures varies from 3 to 5 mm. No siphuncle has been observed. A small 

 flattened fragment from Idlewood ravine (twenty-five feet below the Encrinal 

 limestone) is, with some doubt, referred to this species, A similar fragment 

 from twelve feet below the Encrinal limestone may be of the same species. 



