154 



Report of the State Geologist. 



Manticoceras fasctculatum, sp. nov. 



Figures 13 and 14. Distal extremity and lateral view of the protoconch, 

 showing the first septum and the sipho. x 30. 



Figure 15, First chamber viewed from the venter, showing first and second 

 septa, x 30. 



Figure 16. Protoconch and nepionic shell, showing variation in curve of 

 septa, x 30. 



Figure 17. An incrustation in pyrite of the nepionic volution, showing the 

 depth of successive chambers, x 30. 



Figures 18 and 19. Shells of three and four volutions, showing the charac- 

 teristic duplicate or fasciculate ornament and wide umbilication. x 3. 



Figure 20. Cast of an early neanic loculus, viewed from the inferior or dorsal 

 side ; showing the wrinkles of the inner shell layer on the lateral 

 slopes, x 30. 



Figure 21. A shell of mature size showing the early ornament and the 

 smooth, broadened final whorl, x 3. 



Figure 22. A somewhat imperfect shell, x 2. 



All of the specimens are from the Styliola limestone on 

 Canandaigua lake, and at Middlesex, Yates county. 



Figures 13, 14, 15, 16, 17 and 20 are from internal casts or incrustations in 

 pyrite, the others are from barite replacements. 



(?) Sandbergeroceras syngonum, sp. nov. 



(See Plate VII). 



Figure 23. This represents the inner nodose whorls of a very broad backed 

 shell which probably belongs to the species above named, x 3. 

 From a concretion on Honeoye lake. 



Manticoceras nodifer, Clarke. 



Figures 24 and 25. The original specimens of the species. (Coll. National 

 Museum). 



Figure 26. An enlargement of the inner whorls showing their nodose char- 

 acter, x 10. 



Styliola limestone, Canandaigua lake. 



