248 



or a little within it, then gently convex to the suture ; close to the mar- 

 ginal ridge there is a distinct groove following it all the way to the centre 

 of the disc. On the outside the whorls are gently convex and sub-verti- 

 cal, apparently sloping a little outwards in the last whorl, and inwards in 

 the smaller ones. On the under side the whorls are rather strongly con- 

 vex, obscurely rounded, descending with a somewhat flat slope into the 

 umbilicus, which is wide and concave. Where the shell is preserved, on 

 the outside of one of the inner whorls, it shews four or five narrow, thread- 

 like ridges, following the whorl longitudinally. 



This species must be closely allied to H. Proserpina. It differs from it 

 in having a marginal ridge on the upper side, and in the form of the whorls 

 on the lower side not so prominently rounded. 



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

 group. 



Collector. J. Richardson. 



HELICOTOMA GORGONEA. (N. sp.) 



Description. Shell large, depressed conical. Whorls about four, 

 nearly cylindrical. On the upper side (as ascertained by a vertical 

 polished section), the whorls are turretted, each rising about one-fourth 

 its own diameter above the preceding. On the under side strongly and 

 uniformly convex, or cylindrical ; umbilicus not quite half the width, 

 exposing all the whorls to the apex in stair-case arrangement. 



Width 2i inches ; width of the last whorl at the aperture 9 lines ; 

 height about the same. 



The specimen shews the under side, the spire being imbedded in lime- 

 stone. The whorls below, and in the umbilicus (which is nearly empty), 

 are uniformly cylindrical, apparently a little flattened along the middle of 

 the lower side, but above, as seen in the section, they seem to be obtusely 

 angulated half way between the margin and the suture. The inner upper 

 side of each is also impressed by the one next above it. 



This species, so far as its form can be made out, resembles closely some 

 of the large EuompJiali with cylindrical and slightly angulated whorls, 

 which abound in the Devonian and Carboniferous series. 



It may be that this species is only a variety of H. Proserpina. 



Locality and Formation. H, Table Head, Newfoundland; Quebec 

 group. 



Collector. J. Richardson. 



