W. S. Sudledon — Oti the Yorkshire Oolites. 195 



it appears in a spathic condition in the hard calciferous grit of the 

 Scarborough Kelloway Kock. All three processes are shortened by- 

 fracture. The two keels on the body-whorl are stout, but not sharp : 

 as in the previous specimen, the upper one is slightly the more 

 salient, but the lower one is the stouter, and evidently carries the 

 strongest digitation. Both possess a slight appearance of notching, 

 which, in the hands of fox'eign artists, assumes considerable pro- 

 jDortions. The extremely fine spiral lines which pass over the whole 

 shell, including the keels, are scarcely visible ; still less the fine 

 axial lines on the wing and base of the body-whorl. 



This specimen may be regarded as representing Piette's rendering 

 of A. cocJileata, Quens., said to be a Callovian form. 



Specimen from the Oxford Clay (zone 6), Scarborough. Leckenby 

 Collection. Plate VII. Fig. 2. 



This specimen seems to throw light on Phillips's remarkable 

 figure. It is much compressed, as is usually the case with fossils 

 from the Oxford Clay of Scarborough. The fine spiral lines, and 

 the fretting in the keels is noticeable ; whence we may infer that it 

 is not a mere internal mould, although all the shell substance is 

 gone. The specimen serves to show us the number and nature of 

 the digitations to a degree seldom seen in the Yorkshire beds. None 

 of the terminations are quite complete; the middle one, which is the 

 stoutest, being the most deficient. The upper finger commences to 

 curve at once on quitting the spire, whilst the middle one continues 

 nearly in line with its keel, though with a slight anterior inclination, 

 so that the intercarinal space widens towards the margin of the 

 whorl. The tail begins to curve at once ; it would seem to be about 

 as long as the entire spire. 



Specimen from the red-stained Oolite of the Kelloway Eock (zone 

 o), Scarborough. Leckenby Collection. Plate VII. Figs. 3, and oa. 



Six whorls are visible, and about three more may have existed : 

 length, excluding canal, 14 mm. The shell substance is in a cor- 

 roded condition, and the indications, as regards ornament, not 

 thoroughly reliable. The penult and antepenult show the broad 

 median keel, and the nearly straight outline of the anterior half of 

 the whorls : the spiral lines are strong. The last whorl is strongly 

 and equally bicarinate. The aperture is large, and angular in the 

 direction of the outer lip, which is produced outwards with a slight 

 curve towards a point where it forms an obtuse angle, and then runs 

 nearly straight towards a second angle, beyond which there are no 

 indications. 



From the above I am inclined to regard this specimen as repre- 

 senting the front view of at least a variety of Al. trifida. The only 

 difi'erence, other than those arising from position and the absence of 

 the wing-processes, consists in the coarser nature of the spiral lines. 

 This may be a result of mineral condition. 



It will be observed that most of the specimens of Alaria figured 

 on the two plates are back views. The collections of Yorkshire 

 fossils seem deficient in specimens yielding a front view ; and when 

 we do get one, the wing is nearly always imperfect. 



