W. S. JECudleston — On the Yorkshire Oolites. 197 



Mention has already been made of the identification by Phillips, in 

 his third edition, of his figure (Gr. Y. pi. vi. fig. 13), with Deslong- 

 champs' species. This I conceive to be very unlikely, but it does not 

 materially afiect the case. 



Description. — Specimen from the Millepore Eock (zone 2), Cloug]i- 

 ton (Sycarham). Leckenby Collection. 



The spire, which is only indifferently preserved, has an angle of 

 about 30° ; length of the restored specimen without the tail about 

 34mm. The whorls towards the apex are moderately convex 

 (the suture not being deep), and marked by very faint spiral lines, 

 which are rather stronger in the anterior whorls : no longitudinal 

 costee are visible, though there are some obscure markings, the 

 nature of which is not easy ta determine. In the penult a very 

 faint keel is developed. The body-whorl is not very tumid, but 

 carries a strong median keel, with a large spine opposite the wing. 

 The nature of the wing is by no means clear. There is a con- 

 siderable callus on the columella. 



Relations and Distribution. — The comparatively unornamented 

 spire, the slight keel of the penult, and the strong keel of the body- 

 whorl, seem to connect this form with Deslongchamps' species ; the 

 amount of callus on the columella also bears a resemblance to Des- 

 longchamps' figure. There is one other specimen from the Corn- 

 brash, also in the Leckenby Collection, which may perhaps be 

 referred here. None others are known to me from the Yorkshire 

 beds. 



42. — Alaria mtueus, var. teiies. Plate VII. Figs. 4, 4a. 



Description. — Specimen from the Cornbrash (zone 4), Scarborough. 

 Leckenby Collection. Plate VII. Figs. 4, 4a. 



Length 23 millimetres. 



Width of last whorl to length of shell 50 : 100. 



Approximate spiral angle 42°. 



Shell fusiform, scarcely turrited. Seven whorls are visible, and 

 the complete spire would probably consist of about ten. All the 

 whorls are extremely tumid : those towards the apex are, in this 

 specimen, devoid of ornament ; but this may be an accidental cir- 

 cumstance due to usage. The three lowest whorls are spirally 

 striated : the furrows are narrow and shallow : there are about 20 

 on the penultinate, the intervening space being about three times 

 the width of each groove, and presenting a flat, strap-like appear- 

 ance. One of these straps, towards the middle of the whorl, is 

 rather wider than the rest, but scarcely more prominent. This 

 represents the median keel. Precisely the same kind of ornament 

 is continued throughout the body-whorl, which developes two keels : 

 these are of slight prominence, being in fact like two straps some- 

 what wider than the rest. The digitations are broken ; but there 

 can be little doubt that the lower keel was continued, and that the 

 specimen was trifid. 



Relations and Distribution. — The smoothness and convexity of this 

 form is remarkable. The features of Al. myuriis seem to be exaggerated 

 until the identity is lost, and this almost becomes a new species. It 



