246 W. S. HucUeston — On the Yorkshire Oolites. 



Shell elongate, smooth, subulate. Whorls short, and rather convex, 

 especially the anterior ones. Surface smooth. Suture fairly marked. 

 Lines of growth faint. Aperture involved in matrix. 



(Fig. 8), — Specimen from the Cornbrash (zone 4), Scarborough. 

 Leckenby Collection. 



The spire is much injured, but the three anterior whorls are in 

 good preservation. These whorls are extremely round and full, with 

 a deep suture which gives a strangulated appearance. The whorls 

 are so extremely smooth that even the lines of growth can scarcely 

 be detected. 



Belations and Distribution. — Very little of a satisfactory nature can 

 be made out of these supposed Eulimas in the Yorkshire beds. 

 The Cornbrash specimen described above is, as far as the anterior 

 whorls go, in an excellent state of preservation. The marked con- 

 vexity, even roundness of the whorl, and the absence of any punctate 

 structure, are distinguishing features. It does not seem to tally 

 quite either with the description of Eti. communis or with the type of 

 Eu. liBvigata (Fig. 7). Rigaux and Sauvage quote both these species 

 from the Cornbrash (Calc. 4 RhyncJi. Baclensis) of the Boulonnais. 

 Found sparingly in zones 3, 4, and 5. 



A specimen from the Chert bed of the Kelloway Rock was figured 

 and described as '• Ghem. lineata " by Leckenby, Q. J. G. S., February, 

 1859. This was subsequently regarded by the author as a Ealima. 

 The specimen is not in a satisfactory condition for specific determi- 

 nation. If the spiral lines are visible, the specimen is most probably 

 the young stage of Chemnitzia. 



" Chemnitzia " vetusta group. 



These fossils are more numerous and better preserved in the 

 Inferior Oolite of the Anglo-Norman area than elsewhere, and 

 would naturally attract the attention of authors. No paleontologist 

 of the present day can read the introduction to the memoir " sur les 

 Melanies fossiles " by the elder Deslongcharaps, written just forty 

 years ago, without a tacit feeling of respect for the sagacity of that 

 observer of former days. The difficulties he then felt are difficulties 

 still. "Plusieurs (des Melanies) sont de petite taille et se rap- 

 prochent par leur fades, de quelques-un des Cerites decrits dans le 

 Memoire precedent, mais leur ouverture c'est plus decidement celle 

 des Melanies. Pour exprimer toute ma pensee, je crois qu'il y a des 

 passages entre ces especes anciennes." 



The substitution of the genus Chemnitzia for the supposed Melanice 

 of the Jurassic period increases the difficulty as regards the small 

 costate forms now under consideration, which constitute a sort of 

 debatable ground on the borders of the genus Cerithium. These 

 remarks apply to a number of fossils, to which I would give the 

 name vetusta-group, from their relationship to the original Terebra 

 vetusta, Phil., which occurs in the Millepore Bed (zone 2) of 

 Cloughton Wyke.' A remorseless lumper of varietal forms might 

 indeed unite them all mader one "species," to which the name 

 vetusta would, in right of priority, attach. 

 1 See below, p. 248. 



