GASTROPODA. 855 
Bellerophontiidze.] 
Euruemus, McCoy* (emend., Waagen+). Shell more or less globular or lenticu- 
lar; whorls rounded, embracing so that there is no umbilicus; aperture not abruptly 
expanded, with the outer lip bilobed, the central insinuation moderately deep and 
rather wide; slit-band wide, defined on each side by a thin or thicker ridge; inner lip 
somewhat callous in its lateral parts, while the central portion spreads itself as a 
thin, longitudinally folded sheet over the inner volutions, These revolving ridges, 
or, as Waagen calls them, columellar folds, extend a greater or less distance beyond 
the aperture, in some cases reaching a point half around the last whorl. Beyond 
them to the outer edge of the aperture the surface usually appears smooth, but in 
perfectly preserved specimens it presents very fine lines of growth running parallel 
with the outline of the aperture. Type, H. wrii Fleming sp. 
Both McCoy and Waagen deny the existence of a slit-band, but Koken maintains 
(op. cit., p. 893)—and, so far as the American species are concerned, we have material 
before us which permits us to sustain his assertion with absolute certainty—that it 
was always present. That it often, indeed generally, appears to be absent is due to 
the extreme liability of the outer or sculpture bearing layer of the shell to destruc- 
tion, while on the inner volutions it is covered by the revolving columellar folds. 
For further remarks see under Mogulia (page 856.) 
AMERICAN SPECIES. 
Ei (Bellerophon) carbonarius Cox. Coal Meas. E#. (Bellerophon) modocarinatus Hall. Coal Meas. 
FOREIGN SPECIES. 
E. (Bellerophon) orbignyanus Portlock. Carboniferous. Europe. 
E. uri Fleming sp. Carboniferous. Europe. 
E. indicus Waagen. Permo-Carboniferous. India. 
EH. apertus Waagen. Permo-Carboniferus. India. 
EH. laevis Waagen. Permo-Carboniferous. India. 
#. lenticularis Waagen. Permo-Carboniferous. India. 
Warrtuia, Waagen.{ Smooth globular non-umbilicated shells, with a broad 
and rather deep rounded sinus in the outer lip, but without either a slit or slit-band. 
Inner lip only very slightly thickened, not extensive nor spreading (as in 
Protowarthia) over the umbilical regions. Aperture without lateral expansions. 
No revolving lines; striz of growth very indistinct. Type, W. polita Waagen. 
This genus is readily distinguished from Bellerophon by the breadth of the 
sinus in the outer lip and the entire absence of a slit-band. It is however singu- 
larly like the early Paleozoic group of shells for which we have created the genus 
Protowarthia. For comparisons and remarks on the probable significance of this 
and the preceding genus see below under Mogulia. So far as known Warthia 
is not represented in American strata. Waagen describes three species from the 
~_*Synop. Carb. Foss. Ireland, p. 25; 1862. 
+ Pal. Indica, ser. 13, pt. 2, pp. 131, 163. 
$ Pal. Indica, ser. 13. pt. 2, pp. 131, 158; 1880. 
