59. CONTRIBUTION TO 



(chamber walls) rather close, there being about nine on the specimen (Figs. 10 

 and 11). The shell is but slightly elliptical in cross section (latterally). The 

 surface is crossed by fine lines of growth running circularly around the shell. 

 The siphuncle is small and located ventrally. Length of figured specimen (Figs. 

 10, 11 and 12) 3^ centimeters, greatest thickness (latterally) 2^c. m., dorso-ven- 

 tral diameter 2^ c. m. 



The shape of the aperature, ornamentation, position of the siphuncle, and 

 greatly inflated body will readily distinguish this species. 



Found in Hamilton division of the Devonian at Charlestown, Ind. 



The types are in the collection of Mr. G. K. Greene. 



GOMPHOCERAS OVIFORME, Hall Sp. Rowley. 



Plate 21. Figs. 13-14. 



It is elongate club-shaped and consists of portions of eight septal segments 

 behind the living chamber. The condition of preservation is such that the 

 siphuncle can not be located. 



It is from the cherty layers of the Upper Helderberg Group at the Falls of 

 the Ohio, and the specimen figured is the property of Mr. G. K. Greene, 



CRANOCERAS? ELLIPTICUM, N. Sp. (Rowley.) 

 Plate 21. Figs. 15-16. 



There is some doubt about the generic relation of this specimen. It con- 

 sists of nine chambers, probably near the anterior portion of the shell. The 

 sutures are straight and the siphuncle is small and near the ventral side. It is 

 a portion of a shell that is accurate, and expands rather rapidly toward the 

 front. Nothing is known of the living chamber, nor of the real shell surface as 

 the type specimen is an internal cast. We are aware that Cranoceras is a Silu- 

 rian genus while our type comes from the Hamilton (Devonian) beds near 

 Charlestown, Ind. Collection of G. K. Greene. 



T E M N C H I L U S ? Sp. 



Plate 21. Fig. 17. 



Is a drawing of a specimen broken across the whorls and still imbedded in 

 the matrix. Where the septa are jagged they have been restored, but no at- 

 tempt has been made to fill out the missing partitions and lost partitions of the 

 siphuncle. 



