414 APPENDIX E. — PALiEONTOLOGY. 



edge of tlie last volution, which has scarcely a distinct carina ; 

 upper margin of the volutions, along the suture, marked by an 

 elevated nodulose ridge, giving a beautiful coronate feature to the 

 upper part of the shell. Umbilicus, none. 



Fig. 6 a, view of the upper surface of the shell. 



Fig. 6 b, view of the aperture, which is imperfect. 



Fig. 6 c, anterior view of the shell. 



Fig. 6 d, base of the shell. 



This beautiful species was found with other carboniferous fossils. 



EUOMPHALUS SUBPLANUS, Hall. (n. sp.) 

 Plate IV. Fig. Tab. 



Spiral, convolute ; volutions about five, in contact, round, or 

 very obtusely sub-angular on the upper outer margin of old speci- 

 mens, surface evenly striated. 



In young specimens the apex is depressed, but in the specimen 

 figured it is slightly above the outer volution. The specimen fig. 

 7 b is the under side of a cast of an individual of apparently the 

 same species, the absence of the shell leaving the volutions not in 

 contact. 



Fig. 7 a, view of the upper side of a specimen from limestone 

 on the top of Stansbury's Island, Great Salt Lake. 



Fig. 7 b, a cast in limestone from between the Big and Little 

 Blue Rivers. 



