202 W. H. Hudleston—On the Yorkshire OoUtes. 



that they are the same, then this must be regarded as the better 

 representative of T. opalina, and Bean's specimen will have to be 

 quoted as T. canina absolutely. 



Relations and Distribution. — The two forms classed under the head 

 of T. opalina, var. canina, represent a group of elongate Turritell<^ 

 which have a slender apex, and numerous short globose apical whorls 

 with a crowded system of spiral lines. The anterior portions of the 

 spire present whorls slightly more angular in outline, and with a 

 well-defined system of spiral bands, of which there are about seven 

 without counting any finer lines which may happen to exist. There 

 are two varieties of these elongate Turritellcs, allied to T. opalina, 

 which occur in the Inferior Oolite of the Sherborne-Yeovil district. 

 One of these has ornaments not dissimilar to the Dogger shells, such 

 differences as exist being partly due to difference of matrix ; but its 

 whorls are much higher, so that an equal number of whorls produces 

 a much longer spire. The vertical strias are also well shown in the 

 south country specimens. I merely mention this to show that the 

 Inferior Oolite of England is by no means deficient in fossils of this 

 class. 



As regards the distribution of the T. opalina group in Yorkshire, 

 most of the small fragments with a globose whorl and deep suture, 

 which are sparingly found in Museums, belong here rather than to 

 the next named species. The number of spirals shows this at once. 

 For the samQ reason I would refer specimens from the Millepore 

 Kock to a pygmy variety of this group, and not to T. quadrivittata, 

 which is a rarer species. 



There is a fossil, only a few millimetres long, in the York Museum 

 marked " Terebra melanioides," which may represent the apical con- 

 dition of Section A. Curiously enough, it occurs in precisely the 

 same variety of Dogger rock. 



47. — TuRRiTELLA QUADRIVITTATA, Phillips, 1829. Plate VII. 

 Figs. 11, 11a, 12. 



1829 and 1835. Turritella quadrivittata, Phillips, G. T. p. 129, pi. xi. fig. 23. 

 1849. Cerithium quadrivittatttm, D'Orh. Prod. i. p. 271. (Bajocieu.) 

 1854. Turritella quadrivittata, Phil. Morr. Cat. p. 284. 



,, Cerithiiim quadrivittatwn, Phil. Ih. p. 240. 

 1875. Cerithium quadrivittatwn, Phillips, G. Y. 3rd edition, p. 258, pi. xi. fig. 23. 



Bibliography, etc. — As a matter of course, D'Orbigny placed 

 Phillips' species under Cerithium. In so doing he had a double 

 motive. Morris seems to have been in doubt, since he makes a 

 double entry, which is rather unusual. Mr. Leckenby was not dis- 

 posed to regard this fossil as a Cerithium, j^et Phillips in his last 

 edition quotes it as such. 



Description. — Specimen from the Dogger (zone 1), Peak (Blue 

 Wyke). York Museum. Fig. 11 magnified twice, Fig. 11a magni- 

 fied four times. 



Type Specimen he-figured. Magnified twice. 



Length restored 14 millimetres. 



Width 4i „ 



Height of whorl to width 60 : 100. 



Spiral angle 28°. 



