398 W. H. Hudleston—The Yorkshire Oolite. 
again extremely abundant at the base of the Coral Rag of the 
Scarborough district, and in parts of the Coralline Oolite of Malton. 
12.—** PHASIANELLA ” STRIATA, Sow. ; var. BARTONENSIS. Plate XIV. 
Fig. 2, back and front. 
Description. —Specimen from the Coral Rag between Slingsby and 
Barton (my Collection). 
Length (restored) — ..0ecv005 ety ensures ys 81 millimetres. 
AWTGHHN 5 Se Gee ing 5 s8s56 995 coos 6s 5a485- Bis. ks 
Length of body-whorl to entire shell ........ 38 : 100. 
Sponpll BAB ooo sab sss o4dos099 SoagDa07 30°. 
The chief differences noticeable between this variety and the 
ordinary Ph. striata are, firstly, that the spiral angle is less open 
than in the specimens of Ph. striata from the Corallian rocks of 
Yorkshire, where it usually amounts to 40°. Secondly, the upper 
part of the whorl is less tumid, whilst the lower part exhibits a 
sharp turn in, which accentuates the sutural excavation. This 
peculiarity seems to arise from each whorl being less completely 
covered by its successor than is the case in the ordinary form. 
Thirdly, the aperture is inclined to be subquadrate instead of oval; but 
as the outer lip is not quite perfect, we must not feel too sure of this. 
The shell also would seem to be rather thicker. 
Relations and Distribution.—This form does not seem to have been 
noticed generally, and we may conclude that it is rare. Deslong- 
champs has figured! a variety of Sowerby’s species from the Argile 
d@’Honfleur (Kimmeridge Clay) at Villerville, in which the spiral 
angle and general characters appear much the same as in the Barton 
specimen ; hence, the horizon of these elongated varieties may be 
higher than that of the more ordinary forms. In Yorkshire I have 
found one or two casts of the var. Bartonensis at different localities 
in the Coral Rag of the Howardians, where the more regular form is 
far from being common. Neither in England nor in the Boulonnais 
has any member of this striata group been recorded from more 
recent beds of Jurassic age. 
13.—PsEUDOMELANIA GRACILIS, sp.n. Plate XIV. Figs. 3a. and 30. 
It seems somewhat strange to go in search of a new name for such 
a plain shell as this—yet its unornamented character renders it all 
the more difficult of identification. Buecinum sublineatum, Roem. 
(N. O. G. p. 189, pl. xi. fig. 22), is something like; and the repro- 
duction of this species by D’Orbigny as a Chemnitzia (Terr. Jurass. 
vol. il. p. 56, pl. 241, fig. 6) from the Oxfordian Oolite of Trouville 
is still more so, but that author gives a spiral angle of no more than 
25°—which is hardly enough for our shell. Von Seebach (Han. Jur. 
pl. vii. fig. 2) has a figure of Chemmnitzia striatella, identified by 
Brauns with Reemer’s species from the Lower Kimmeridge of North 
Germany, which has much less resemblance. There are of course 
plenty of other figures and descriptions which nearly fit, but none 
exactly. In this case, therefore, a new species might do less harm 
than an incorrect identification. 
1 Mem. Soc, Linn, Norm. tom. vii pl. 12, fig. 4. 
