• 189 



whorl is broken off, it was, when perfect, probably several lines wider ; 

 width of last whorl, where broken off, 4 J lines ; height 6i lines. 



Locality and Formation. — Point L^vis ; in limestone No. 2, Quebec 

 group. 



Collectors. — J. Richardson and R. Bell. 



Ophileta abdita. (N. sp.) 



Description. — From one to three inches across, consisting of from three 

 to five slender whorls, uniformly rounded on the upper side. Spire flat, 

 or concave, umbilicus probably wide and concave, but not observed. 



The specimens are all partially imbedded, shewing only the upper side. 

 The best preserved 2|^ inches across ; the last whorl, where broken off, 7 

 lines wide. It appears to have five whorls. This may be a variety of the 

 M. profunda^ but the whorls are more slender, and it has a different aspect. 

 It occurs along with M. profunda at Point Levis, and also at Philipsburgh. 



MuRCHisoNiA Jessica. (N. sp.) 



Fig. 170. 



Description. — Shell of medium size ; apical angle between 50° and 60° ; 

 whorls about four, strongly convex, with a rounded angle a little above the 

 middle, thence to the suture depressed convex, below the angle more uni- 

 formly ventricose. The body whorl is large, forming more than half the 

 length of the shell. The suture is deep and the whorls strongly project- 

 ing. Surface unknown, the specimen being a cast of the interior, on which, 

 however, are impressed numerous obscure grooves which cross the whorl 

 from the suture backwards to the angle, and then gently forwards. 



This shell is closely allied to M. ventricosa (Hall), but differs in not 

 being so oblique, and in having the shell undulated. 



Locality and Formation. — Point Levis ; in limestone No. 2, Quebec 

 group. 



Collector. — J. Richardson. 



MuRCHisoNiA Cassandra. (N. sp.) 



Fig, 171. 



Description. — Shell rather small, apical angle between 50° and ^ < ; 

 whorls about five, strongly and uniformly ventricose, with a narrow indis- 

 tinct band about the middle. Surface unknown. 



