874 THE PALEONTOLOGY OF MINNESOTA. 
[Protowarthia concinna. 
Formation and locality.—Richmond group of the Cincinnati period, Versailles, Indiana, and Butler 
county, Ohio. 
Collection.—E. O. Ulrich. 
PROTOWARTHIA CONCINNA, 2. Sp. 
PLATE LXIII, FIGS. 36—39., 
Comp. Bellerophon morrowensis MILLER and DYER, 1878, Contr. to Pal., no. 2, p. 8. 
The specimen upon which this species is founded has, although it is much 
smaller, relatively nearly the same dimensions and form as P. subcompressa. The 
dorsum however is narrowly rounded instead of broadly, the aperture is triangular 
rather than semi-ovate, and the sinus is narrower, while the thickened base of the 
lip forms a small sharply defined and shallow umbilical depression which is not 
seen in that species. The surface of the specimen is without markings of any kind 
save on the small end of the visible volution where some traces of minutely granu- 
lose lines are to be detected. Greatest diameter 18 mm.; transverse diameter 13 
mm.; width of aperture 11.5 mm.; central hight of same 8 mm. 
It is possible that this is not distinct from the Bellerophon morrowensis described 
by Miller and Dyer from about the same horizon in Ohio. If they prove to be the 
same then their type specimen must be considerably crushed since it is described as 
“lenticular in form” and with the “dorsal side sharply angular.” Under the 
circumstances we are obliged to consider our species as distinct. 
Formation and locality—Richmond groups of the Cincinnati period, near Spring Vailey, Minnesota. 
Collection.—E. O. Ulrich. 
PROTOWARTHIA oBESA, 7. sp. (Ulrich.) 
PLATE LXIII, FIGS, 45—47. 
Shell rather large, obese, the greatest diameter between 30 mm. and 45 mm., 
the greatest width of the aperture usually about one-tenth less; volutions ventricose, 
almost uniformly rounded, the center of the dorsum just appreciably elevated; 
umbilicus covered by the reflexed or thickened lip, small in the cast; aperture 
transverse, the central hight somewhat greater than half the width; apertural lobes 
rounded, sinus very broad and comparatively shallow, but the depth seems to be 
somewhat variable; test thick. The specimens are all casts of the interior and 
exhibit merely obscure traces of the lines of growth. A small patch of the shell on 
one of the specimens shows that the growth lines are fine and unequal, and that 
revolving lines are wanting. Two or three broad transverse furrows cross the back 
of each of the five specimens before us. These furrows were produced by 
thickened bands upon the inner side of the shell, passing almost directly from side 
