W. S. Hudleston — On the Yorkshire Oolites. 243 



in every way than the rest of the spire. Angle of increase regular, 

 except as regards the keels of the body- whorl, which project beyond. 

 The entire shell is covered with spiral bands having deeply incised 

 granulations : those of the upper whorls are somewhat effaced by 

 usage. The last two whorls are separated by a widish suture ; each 

 is furnished with 4 granulated spiral bands, the lowest two being 

 the most prominent; in the body- whorl these almost amount to a 

 double keel ; the anterior one is especially prominent, and has 

 large and equal granulations, which are nearly circular. The base 

 of the shell, which is very much produced, is likewise occupied by 

 granulated spiral bands with fine axial striaa in the interspaces. 



The aperture is large in all directions ; the outer lip is prolonged 

 without curvature as far as the posterior angle, from which the 

 margin is nearly circular, or with a slight flattening towards the 

 base where it meets the point at the termination of the pillar-lip. 

 Doubtless the edges were crenulated to correspond with the termina- 

 tion of the spiral bands. 



Relations and Distribution. — T. PMUipsii is most probably the 

 local representative of the Turbo Meriani group, which Goldfuss 

 recognized as occurring on several horizons from the Lias upwards, 

 and which doubtless contains forms varying through successive ages, 

 though in many cases the differences are very little more than those 

 due to size, state of preservation, matrix, etc. The specimens in the 

 Leckenby Collection are mostly smaller than the one figured, which 

 must be regarded as above the average in respect of size. 



As regards distribution in Yorkshire, such well-preserved and 

 definite forms are rare, and accoiTling to Mr. Leckenby's arrange- 

 ment, chiefly confined to the Millepore Kock, though we may well 

 expect to find them on higher horizons. I am not at present in a 

 position to say whether there is any representative of the T. Meriani-. 

 Group in the Lower Oolites of other parts of England, but a shell 

 very similar both in size and ornament to our T. PhilUpsii occurs in 

 what is stated to be the Brauner Jura, delta, of Germany.' A form 

 very similar to specimens from the Millepore occurs in the Yorkshire 

 Cornbrash. 



50. — LiTTORTNA, species or variety. Plate YIII. Figs. 2a, 2b. 



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

 Wyke). York Museum. 



Only two whorls are preserved : probable number in the complete 

 spire 5 or 6, with a spiral angle about 45°. Whorls flat, and the 

 penult separated from the body-whorl by a wide suture. The 

 ornaments consist of four granulated spiral bands, differing some- 

 what in character, the highest being the least prominent : the three 

 anterior bands are of nearly equal strength, but differ in detail, 

 as indicated in Fig. 2b. Base of the shell convex, produced and 

 ornamented with granular spiral bands. The outer lip and margin 



1 Specimens are to be seen amongst the Foreign Jurassic Gasteropoda at the 

 British Museum marked " Erown Jiu-a, delta, P. Mohr," and in pencil " T. omafus." 



