116 GASTEROPODA OF THE INFERIOR OOLITE. 
34, Ataria HAMuS, Desl., var. Parisi, D’Orbigny, 1850. Plate IV, figs. 8 a, 
8 b, 8c. 
1829. RosreLnarta composita, Sow. Phillips, G. Y., pp. 124, 129, 165, pl. ix, 
fig. 28. 
1850. Prrrocera Purixrest, D’Orbigny. Prod., i, p. 270. 
1858. Anarta Pururpsir, D’Orb. Morris and Lycett, Great-Ool. Moll., p. 111, 
pl. xv, figs. 15, 15 a. 
1854. — — — Morris, Catalogue, p. 234. 
1867. — — D’ Orb. = Au. HaMus, Desl. Laube, Gast. von Balin, 
p. 23. 
1884. —  uHamus, Desl., var. Puiuuirsi1, D’Orb. Hudleston, Geol. Mag., 
dec. iii, vol. i, p. 145, 
pl. vi, figs. 3 and 4. 
Bibliography, &c.—It is noticeable that Morris regarded Al. hamus as a species of 
the Great Oolite only, and Al. Phillipsii as a species confined to the Inferior Oolite 
in England (Scarborough Limestone, &.). It has already been shown that Morris 
and Lycett were incorrect in their identification of Deslongchamps’ species, which 
can scarcely be said to occur in the Great Oolite in England. But it is evident 
that Morris, judging from the localities quoted in his “* Catalogue,” regarded Al. 
Phillipsti and the true Al. hamus as the same species. Laube takes the same view, 
but gives no figure. 
If we could obtain perfect specimens of each, the point might be settled. Up 
to the present time I have never seen a Yorkshire specimen with the wing-digita- 
tion preserved. In fact I have never seen from any locality in England a specimen 
of the variety Phillipsii with the digitation. 
Lately an unusually good specimen (fig. 8 a) was obtained from the Scarborough 
Limestone. 
Description.—The points in which this differs from the Dorsetshire Al. hamus 
are that the spire is more slender, the costule are smaller, and the whorls are less 
boldly muricated ; the aperture is subtriangular as in Al. hamus, and I think there 
are traces of the spinous swellings on the upper keel of the body-whorl. Imperfect 
specimens from the Dogger (fig. 8 6) and from the Millipore-bed (fig. 8 ¢) seem to 
bear out this view. 
Relations and Distribution.—But little more need be said about the relations of 
this very doubtful species or variety. Most specimens of Alaria from the Inferior 
Oolite, which possess a moderately thin spire with longitudinal costule arranged 
in a circlet anteriorly on the whorls, and a plain bicarinate body-whorl are likely 
to be thus referred. The type is a very general one throughout the Oolites, and 
