W. H. Hudleston — On the Yorkshire Oolites. 199 



culated. In the upper whorls this tuberculation is extended axially 

 so as almost to reach from suture to suture ; but in the last two 

 whorls it is confined to the region of the keels, and thus becomes 

 a real tuberculation. The whole of the spire is marked with rather 

 strong spiral lines. The bodj^-whorl carries two keels : the upper 

 one is the strongest, and has tubercles very similar to those ou the 

 keel of the penult : the tuberculations of the lower keel are less 

 strong. The nature of the wing is uncertain, there being no outer 

 lip preserved (N.B. The thick appearance is due to a quantity of 

 matrix being left for purposes of preservation) : the columella is 

 thin and straight for some distance ; canal long and moderately 

 curved. 



Belaiions and Distribution. — This species possesses some interest 

 as the earliest example of Alaria at present known from the York- 

 shire Jura. Some of the peculiarities of the figured specimen are 

 partly due to the matrix and mode of development, which tend 

 somewhat to narrow the spire. Bearing this in mind, I observe that, 

 as regards the tuberculations on the lower whorls, it has some 

 resemblance to the figures of Bostellaria suhpunctata, Miinst. (Goldf. 

 vol. iii. p. 14, pi. 169, fig. 7). Piette {op. cit. p. 23) alludes to a 

 variety figured by Terquem from the opalinus zone. 



A comparison with Al. Phillipsii shows closer affinities. In both 

 species the ornaments of the apical whorls are of a somewhat similar 

 character, but whilst, in Al. Fhillipsii, the longitudinal costulte are 

 chiefly developed on the keels and anterior thereto, in this species 

 they have rather a tendency towards the posterior half. But the 

 chief difference lies in the tuberculated keels of the body-whorl, in 

 the coarseness of the spiral lines, and perhaps in the more attenuated 

 form of the shell. 



There are two specimens in the Leckenby Collection, and the 

 matrix shows at once that they belong to the Dogger Sands, though 

 such is not always the case with specimens so marked in that 

 collection. 



45.— Alaria (?) sp. PI. YII. Fig. 8. 

 18 — . "i?'«MMS, Scarborougli," Bean MS. 



Description. — Specimen from the Kelloway Kock (zone 5), Scar- 

 borough. Bean Collection, British Museum. 



The remains of three whorls may be traced, the probable spiral 

 angle being 28°. All three are strongly bicarinate. Owing to the 

 polished condition of the fossil, an unnatural smoothness results, due 

 very probably to the action of blown sand on the spathic shell during 

 weathering. The matrix is the red-stained Oolite-grit of the Kello- 

 way Kock. It is not unlikely that the keels were crenulate, whilst 

 distinct spiral lines are traceable on some of the whorls. An axial 

 row of spinous tuberculations is a characteristic feature, and con- 

 siderations of symmetry would suggest that a similar row must 

 exist on the opposite side : these tubercles spring from the keels, the 

 lower one in each case being the strongest. A portion of the shell 

 has, I think, been broken off, so that we do not possess the complete 

 spire, much of the body- whorl being in all probability missing. 



