THE 
GEOLOGICAL MAGAZINE. 
NEW SERIES. DECADE II. VOL. VII. 
No. XII—DECEMBER, 1880. 
ORIGINAL ARTICLES. 
ee 
J.—ConrRIBUTIONS TO THE PALHONTOLOGY OF THE YorKSHIRE 
OourTEs.! 
PART V. 
By Witrrw H. Hupreston, M.A., F.G.8., V.P.G.A. 
(PLATE XVIL.) 
28,_Nurina@A PSEUDOVISURGIS, sp.n. Pl. XVII. Fig. 1. 
Description.—Specimen from the Coralline Oolite of Pickering 
(Leckenby Collection). 
Length (full) 0... secre cece ee cree ee ener 83 millimétres. 
Width (full)... 2... cee cece ee cece ee cee ee ees 17 » 
Length of last whorl to entire shell ..........+: 23: 100 
Spiral angle ...... 1... eee cece ee eee teens 14°. 
Shell moderately elongate. conical, solid. Spire formed of an 
angle very nearly regular. The whorls are numerous and of mode- 
rate height. The posterior whorls in this specimen have suffered 
from abrasion. They are nearly flat, and the ornaments were ap- 
parently similar to those in the central part of the shell. The orna- 
ments on the anterior whorls, if ever they existed, are for the 
most part obliterated, but the nodular character of the rim at 
the base of éach whorl is still shown; these whorls are moderately 
excavated. The ornaments on the portions preserved in the centre 
are as follows. Each whorl is slightly depressed in the middle, 
and closely fitted on to the next bya raised nodular rim: that 
rim which is at the base of each whorl is by far the most nodular. 
Five transverse rows of granulations, the three centre ones being 
the strongest, fill up the space between the rims. 
The outer lip is broken away posteriorly, but the general shape of 
the aperture is trapezoidal to quadrate, with a considerable prolonga- 
tion of the canal anteriorly. 
Relations and Distribution—It is quite clear that this species is 
pretty near to N. visurgis. The chief differences are—firstly, this 
form is more elongate. The spiral angle in Reemer’s figure of N. 
visurgis is 19°, and D’Orbigny gives it as 20°. Secondly, ours is a 
more highly ornamented shell: Roemer’s description is not very 
close, but his figure only shows two rows of transverse granulations 
in the middle portion of the whorl. It may be convenient to lump 
all these shells under the general title of N. visurgis, including even 
such stumpy forms as N. castor, but, whatever names we give, such 
marked differences should at least be pointed out. Still if we must 
seek for the nearest foreign relations of the Yorkshire Nerinza, 1 
1 Continued from the November Number, p. 488. 
DECADE Il.— VOL. VII.—NO. XI. 34 
