187 



suture, where the shell is preserved, only slightly impressed. The spire 

 is nearly vertical on one side and sloping on the side opposite. The shell 

 is nearly black, and of a lamellar structure. 



The least of the two specimens collected has only two whorls, and part of 

 the third preserved, so that the characters of the apical portion are unknown. 

 The shell is somewhat exfoliated, and does not shew the surface markings. 

 When placed with the aperture downwards, and viewed from above, the 

 lip is seen as a nearly circular disc-like expansion, the spire forming a 

 central elevation. 



Locality and Formation. Near St. Antoine, above Quebec, in a 

 boulder with /Subulites Psyche ; Quebec group. 

 Collector. J. Richardson. 



HOLOPEA LEIOSOMA ; (N. Sp.) 



Pig. 168. 



Fig. 169. 



Fig. 170. 

 View of the .upper side. 



Fig. 171. 



Fig. 168. Holopea leiosoma 

 % 169. Subulites Psyche. 

 170. Murchisonia Jessica. 

 171. M. Cassandra. 



Description. Shell small, sub-globular, consisting of two whorls ; the 

 last one constituting nearly the whole bulk ; the apical whorl very small, 

 scarcely elevated above the general surface. The aperture is not exposed 

 in the specimen examined, but it must be nearly circular, as the whorls 

 appear to be uniformly ventricose and smooth. 



Width about 6 lines ; height about 4 lines. As the base of the shell of 

 the specimen is imbedded, the precise proportions cannot be ascertained. 

 This species closely resembles H. gibberula, but has the whorls more uni- 

 formly ventricose. 



Locality and Formation. Point LeVis ; in limestone No. 3 ? Quebec 

 group. 



Oolkctor. J. Richardson. 



