INDIANA PALEONTOLOGY. 58. 



GOMPHOC ERAS STRIATUM. N. Sp. (Rowley.) 



Plate 21. Figs. 1-2-3-4. 



The shell, as a whole, is pyriform and the tapering position is probably 

 short. The outer surface is preserved and crossed by numerous fine striae, along 

 the middle of the ventral side, by changing and rechanging direction, form a 

 line of angles pointing backward but without any elevation of the surface be- 

 yond the general contour. The septa or chamber walls are unknown, except the 

 last one, which is but slightly convex on the outer surface. 



The siphuncle is located on the left side and is moderately large. The 

 aperture is not large, with an elliptical top to a low "t." The shell is but 

 slightly dorso-ventrally elliptical and with a slight curvature toward the dorsum. 



A creeping Aulopora-like coral covers much of the surface. The type 

 speciman is nearly three centimeters long, two and one-eighth in greatest 

 breadth, by two in lesser diameter. 



The shape of the aperture, the character of the stria\ and the lateral posi- 

 tion of the siphuncle, will readily serve to identify this species. 



It comes from the Hamilton division of the Devonian, at Charlestown, Ind., 

 and the type specimen is in the collection of Mr. G. K. Greene. 



GOMPHOCERAS BELLATULUM, N. Sp. (Rowley.) 



Plate 21. Figs. 5-6-7-8. 



The body is short, club-shaped, somewhat flattened dorso-ventrally. Sur- 

 face quite smooth with very faint strife, passing circularly around the shell. 

 The septa are moderately close together. The living chamber is shallow. The 

 aperture is "t" shaped with rather a deep stem to the "t." 



The inflated part of the shell passes gradually into the posterior position, 

 not as abruptly as in the previous species. Length of specimen (Figs. 7 and 8) 

 over three centimeters, the greater diameter (latterr.l) 2^ c. m., thelessei (dorso- 

 ventral) 1^ c. m. 



The specimens from which the description has been made were collected 

 from the Hamilton beds of the Devonian at Charlestown, Ind., and are now in 

 the collection of Mr. Geo. K. Greene, of New Albany, Ind. 



GOMPHOCERAS FACETUM, N. Sp. (Rowley.) 



Plate 21. Figs. 9-10-11-12. 

 The body is pear-shaped, the front being greatly inflated. The aperture is 

 almost a round-cornered triangle. The living chamber is not deep. The septa 



