ALARIA. 125 
The aperture is triangular, and produced in a long and slender canal, somewhat 
more curved than in the preceding. In the figured specimen the callus of the 
inner lip extends to the upper keel. 
Rare in the concavus- or Sowerbyi-bed of Halfway House. If a temporary 
name is required, I would distinguish this form as ALARIA DIMIDIATA. 
46. ALARIA PsEUDO-ARMATA, Hudleston, 1884. Plate V, fig. 8. 
1884. ALARIA PSEUDO-ARMATA, Hudleston. Geol. Mag., dee. iii, vol. i, p. 150, 
pl. vi, figs. 6 and 6 a, 
Description : 
Length : : . 26 mm. 
Width of last whorl i length of shell . . 48: 100. 
Spiral angle ‘ . 384°, 
Shell strongly turrited. Whorls syout ten ; these below the apicals are 
extremely angular, the dividing carina occurs about two-thirds down—a feature 
which is very marked in the penultimate. Hach whorl] has about eight short, tuber- 
culated costulz, which are straight and not developed in the anterior areas ; spiral 
ornaments uncertain, apparently irregular. Body-whorl is largely developed, very 
angular, and without costs. It carries a large median keel which supported one 
or two immense spines. Other indications wanting. 
Relations and Distribution—The peculiar character of the spire will serve to 
distinguish this species from any other Alavia in the Inferior Oolite. It evidently 
belongs to the section of unicarinate monodactyls, which carried powerful spines on 
the keel of the body-whorl. It may also have some relationship to Al. armata, 
M. and L., though that species is a difficult one to understand. 
Extremely rare in the Yorkshire Dogger. 
47. Ataria Loruarinatca, Schlumberger, 1864. Plate V, fig. 9. 
1864. Anaria Lorwarinerca, Schlumb. Bull. Soc. Linn. Norm., vol. ix, p. 222, 
pl. vi, figs. 1—3. 
1867. -—— — — Piette, Cont. de la Pal. Frang., p. 105, 
pl. xxi. 
1873. _— — —_ Tawney, Dundry Gasteropoda, p. 14. 
