58 
PALEONTOLOGY OF NEW YORK. 
Euomphalus (Straparollus) inops. 
PLATE XVI, PIG. 5. 
Euomphalus inops. Hall. Illustrations of Devonian Fossils: Gasteropoda, pi. 16. 1876. 
Shell discoid; spire depressed-convex, the apex slightly elevated above the 
plane of the outer volution; lower side broadly and deeply concave. 
Volutions three or more, curving gently inwards -from the periphery, 
without angularity at the dorso-basal margin. Upper side of volutions con¬ 
vex, the last one rounded ; a transverse section near the aperture distinctly 
broad oval, with the lower side making a longer curve than the upper. 
Surface concentrically striated. 
This species is known at present in a single specimen which differs suffi¬ 
ciently from all the others in the New York rocks to be readily distinguished 
by the peculiar concavity of the umbilical area. In general aspect this form 
resembles the young of E. Decewi, but the volutions increase in size less 
rapidly, the umbilical depression is comparatively deeper, and there is no 
evidence of angularity of the outer volution. Compared with E. Hecale of the 
Chemung group, the lower side of the volution is more abruptly curving into 
the umbilicus, and not flattened as in that species (fig. 10, plate 16). 
Formation and locality. In the Schoharie grit, at Schoharie, N. Y. 
Euomphalus (Straparollus) rudis. 
PLATE XVI, FIGS. 6, 7. 
Euomphalus rudis. Hall. Illustrations of Devonian Fossils: Gasteropoda, pi. 16, figs. 6, 7. 1876. 
Shell discoid. Volutions about four when entire, rounded above and slightly 
less convex below, curving abruptly from the inner side into the broad 
umbilicus; periphery rounded; section near the aperture broadly oval; 
inner volutions rising above the plane of the outer one. 
Surface marked by fine strife of growth, which are often irregular and crowded 
in fascicles, and sometimes become sharply defined towards the aperture. 
The specimens of this species are imperfect, and the entire characters cannot 
