34 



shews a number of small rounded spiral ridges from 

 apart crossed by very fine but distinct lines of gi-owtb. 

 tliat much of the shell is ornamented in this way. 



i a hne to 1 line 

 It seems probable 



Fig. 34. 



Fig. 35. 



Fig. 34. — Murchisonia Hermione, front view of a cast of the interior. Fig. 35. poste- 

 rior view of the same specimen a. a portion of the surface a little enlarged. 



Length of specimen 2^ inches ; width of body whorl and aperture 2 

 inches ; height of aperture 1 J inches ; width of the same about 1 inch. 



Locality and Formation. — South point of Large Island, Mingan 

 Islands. Chazy or Black River. 



Collector. — J. Richardson. 



Murchisonia Procris. (N. sp.) 



Description. — Short, conical, very like a small M. hellicincta but more 

 obtuse. Whorls five or six, uniformly and rather strongly ventricose ; 

 apical angle about 50°. Aperture oval somewhat effuse below. Surface 

 with fine but very distinct lines of growth which have a rugose aspect, 

 from six to eight in the width of one line. About the middle of the whorl 

 there is what appears to be a wide flat spiral band bounded on the lower 

 side by a very distinct thread-like ridge. The upper side of the supposed 

 band is not distinguishable in the specimen owing to the imperfection of 

 the shell. 



Lengtli of specimen 1 inch ; width of last whorl including aperture 7 

 lines ; width of aperture 4^ lines ; height of the same 5^ lines. 



Locality and Formation. — Paquette Rapids on the River Ottawa. 

 Black River limestone. Rare. 



Collector. — E. Bilhngs. 



