56 TENTH ANNUAL REPORT. 
versely, tiling from above. It is easy recognizable. Length 
of the individual two-eighths, breadth three-eighths inch. 
Corniferous limestone, Columbus, Ohio. 
Gomphoceras isoteloides, sp. nov. 
(Fig. 2a. Reduced one-half.) 
Length of shell 6 inches, fusiform, transversely sub- 
oval; greatest diameter 2 inches at half length, from whence 
the shell tapers rapidly to either end, measuring at apex 3-8 
inch and at anterior end 14 inch; the posterior half is slightly 
ventricose. The incrusting thin shell, nicely marked with 
fine concentric lines, covers entirely the air-chambers, as 
well as the chamber of habitation, and has the appearance of 
an “Indian relic.” 
Lower Corniferous limestone, U. Held. gr., Owens Sta- 
tion, Marion County, Ohio. 
FIGURE 2. 
(a) Gomphoceras isoteloides. () Gomphoceras parallelum. 
