21 



Explanation of Plate VI. 



(Portage Gastropoda, Cephalopoda, Pteropoda.) 



Fig. 



26-27. Bellerophon iihaccnsis. Rare, at Ithaca. 



28. Platyceras sp. Middle Portage and Chemung. 



29. Macrocheilus (sp. probably macrostomus distorted). Middle 



Portage. 



30. Loxonema (sp. probably delphicola, eroded). Middle Port- 



age, but generally a Hamilton species. 



31. Plenrotomaria capillaria. Middle Portage and Chemung. 



Also in Hamilton beds below. 



32. Gompkoceras tumidum. Middle Portage. 



^. Orthoceras bebryx var. caynga (about 2 /i nat. size). Middle 

 Portage. Common. 



34. Orthoceras dermis. Middle Portage. Ithaca. 



35. Tornoceras peracutum. Outline showing sigmoidal suture 



lines. From middle Portage at Ithaca. In Mantico- 

 t eras pate? sonz, a characteristic west Portage Cephalo- 

 pod, the suture lines run as indicated by a — a. 



36. Bactrites acicula. Middle Portage and eastern Chemung. 



37. Tcntaculites spicuhis. Middle Poitage. Rare. 



Fisr. 



*>■ 



Explanation of Plate VII. 

 (Portage Brachiopoda. ) 



38. Spirifer levis. Lower Portage sandstone, eastward. About 



fi nat. size. 



39. Spirifer mesastriatis* Middle Portage and Chemung, east- 



ward. 



40. Spirifer mesacodalis. 

 41-2. Camaroteechia eximia. 



ward, 

 43. Pugnax pugtius. 

 ward. 



k 1 i i i 



1 1 



