229 



height fourteen lines ; apical angle about lOo^ ; whorls five or six, gently 

 convex, a rather strongly impressed, narrow, concave band, just within 

 the outer margin. 



The umbilicus appears to be about half the whole width, but it cannot 

 be well seen in the specimen. Judging from the appearance presented by 

 a small portion of the shell which is preserved, the suture, in perfect 

 specimens, must be represented by a close seam, not deeply impressed, as 

 in the above figure, 



This specimen is evidently another form of the P. Canadensis group, 

 with a mora elevated spire ard a nanowrer concave band than the 

 others. 



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

 group. 



Collector. — J. Richardson. 



Pledrotomaria Numeria. (N. sp.) 



Fig. 213. 

 Fig. 213. — Pleurotomaria Numeria. a, front view; b, view of the underside. 



Description. — Sub-lenticular ; spire usually much depressed ; whorls 

 on the upper side nearly flat or gently concave, with a slightly elevated 

 marginal edge, sometimes abruptly elevated half a line above each other 

 at the suture. Lower side of whorls strongly convex and angulated at 

 the edge of the umbilicus, descending into the umbilicus with a flat and 

 nearly vertical slope. UmbiHcus about one-third the whole width, exhib- 

 iting all the whorls within. There are about four whorls. Aperture 

 rhomboid-oval ; outer lip in old specimens vertical, in young specimens 

 inclining a little inwards ; upper lip nearly horizontal ; lower side of 

 aperture rounded, but the Up thickened, and often angulated. Surface 

 unknown. 



Width of a large specimen 12 lines : height 6 or 7 lines ; width of 

 aperture 3 or 4 lines. 



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

 group. 



Collector. — J. Richardson. 



