231 



indented by the penultimate Avhorl. In the upper whorls there are four 

 concave spiral grooves or bands, separated by three angular carin^e. The 

 lower sides of the whorls are covered with numerous sharp spiral carinae, 

 two or three in the width of one line. Umbihcus open, disclosing the 

 whorls to the apex. On one of the specimens there are indications of fine 

 transverse lines of growth. 



Width of the largest specimen at the aperture 16 lines ; height from 

 the lower side of the aperture to the apex 14 hnes ; width of the aperture 

 7 lines. 



This species resembles a strongly carinated Cydonema^ and may be, 

 perhaps, a species of that genus. 



Locality and Formation. — G, Cape Norman, Newfoundland ; Quebec 

 group. 



CuUector. — J. Richardson. 



MURCHISONIA CaTHARINA. (N. Sp.) 



Fig. 215. Fig. 216. 



Fig. 217. 



Fig. 218. Fig. 219. Fig. 220. 



Fig. 215. — Murchisonia Catharina, 

 216. — M. acrea. 

 217. — M.Adelina. 



218. — M. sbmdntrix. A variety of 3/. gracilis. 

 219. — M. Cicelia. 

 220. — M. sororcula. A variety of M. perangulala. 



Description. — Shell small, slender ; whorls about fifteen, extremely 

 and sharply angular in the middle, the space between each two of the 

 carinoe being deep and uniformly concave. The form of the spire is that 

 of a deeply threaded screw. The suture appears to be about half way 

 between the caiinations in the bottom of the concave space. Apical 

 angle from 10"^ to 15'^. Surface vmknown. 



Length of a specimen Avith fourteen whorls, from the apex downwards, 

 10 hnes ; width of the last whorl 3 lines. 



