328 SYSTEMATIC PALEONTOLOGY 



Suborder CYRTOCHOANITES 

 Family ACTINOCERATIDAE 



Genus GONIOCERAS Hall 



GONIOCEKAS CHAZIENSE Euedemann 



Plate XLI, Fig. 19 



Gonioceras chaziense Ruedemann, 1906, New York State Mus. Bull., 90, 

 p. 494, pi. xxxvi, figs. 3, 4. 



Description,. " The natural section exposes the septa, which are closely 

 arranged, there being 10 of them counted within the space of 20 mm.; 

 each septum rises within the body of the shell to about the height of five 

 cameras, forming broad and low saddles in the lateral flanges, and becom- 

 ing slightly deflected backward towards the outer margin of the flanges. 

 Their central portions are much thickened by secondary deposits. The 

 outer conch, which according to Hall is also in the other species of 

 Gonioceras excessively thin, is not preserved; the greatest width of the 

 phragmocone, as indicated by the septa, is a little over 70 mm. The 

 phragmocoue appears to have been at least as rapidly expanding as that 

 of G. anceps. The siphuncle is very large (its diameter 7 mm.), strongly 

 nummuloidal, filled with organic deposits which leave open but a narrow 

 endosiphotube. From the latter radiate horizontal tubuli as in the other 

 congeners. We have not been able to ascertain the transverse section of 

 the conch and the surface is unknown." Ruedemann, 1906. 



Occurrence. CHAMBERSBURG LIMESTONE ( Caryocystites bed). Fort 

 Loudon, Franklin County, Pennsylvania. Middle Chazyan of New York. 



Collection. U. S. National Museum. 



Family OOCERATIDAE 



Genus OOGERAS Hyatt 



OOCERAS KIRBYI (Whitfield) 



Plate XXXII, Figs. 19, 20 



Cyrtoceras kirbyi Whitfield, 1889, Bull. Amer. Mus. Nat. Hist, vol. ii, p. 57, 



pi. x, figs. 4-7. 

 Cyrtoceras kirbyi ? Cleland, 1900, Bull. Amer. Pal., vol. iii, p. 131 (259), 



pi. xvii, figs. 3, 4. 



