W. H. Hudleston — On the Yorkshire Oolites. 57 



This is probably an aged shell, or it may have suffered during the 

 process of mineralization. 



Relations and Distribution. — It will be gathered from a comparison 

 of the descriptions under Sections A and B, that there exists a 

 depressed and irregular form (A), and a sub-conical and more regular 

 form (B) ; each of which has hitherto been referred to Turbo 

 (Delphinula) granatus, and had best remain so for the present. The 

 young specimens of Section A have a very wide spiral angle. It is 

 just one of those groups that easily passes into something else, 

 which is nearly, but not quite the same. It may, I think, be 

 seen in collections from the Lincolnshire Limestone, but south of this 

 I have not at present traced it. 



The analogous or representative species in the rich univalve beds 

 of the I.O. of Dorset-Somerset must be sought in Turbo Shaleri, 

 Tawney (Dundry Gasteropoda, p. 23, pi. 2, fig. 3). In Turbo Shaleri, 

 which may well be regarded as belonging to the subgenus Delphinula, 

 the shell is somewhat more depressed than in our section A. ; and 

 the whorls, especially the bodj^-whorls, are more angular and pos- 

 sessed of more prominent and better defined caringe. In T. Shaleri 

 also the umbilicus is wider, and bounded by a spiral of large tubercles, 

 few in number, rather than by the small and numerous granules 

 which surround the umbilicus in D. granata (see Fig. 116). 



Not found in Yorkshire anywhere but in the Dogger of the Peak. 

 Nothing of the kind is quoted by Brauns from N.W. Germany. 

 Amongst the numerous small species of Turbo figured and described 

 by D'Orbigny, we can scarcely doubt that some must be pretty near 

 to Turbo (^Delphinula) granatus. 



71.— TuKBo ? species. Plate IL Fig. 13. 



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

 Wyke). Bean Collection, British Museum. 



( Height 6"75 millimetres. 



Approximate < "Width 5-50 ,, 



( Spiral angle 75°. 



Shell small, trochiform, higher than wide. Spire subacute, and 

 composed of about five whorls, which are almost regular in their 

 increase ; apical whorls nearly smooth ; anterior whorls angular, 

 spirally granulate, and ornamented by carinje with larger granulations, 

 which vary somewhat in each whorl, but may be described as follows : 

 (1) a fringe of beady granules close to the suture; (2) a double 

 I'ow of beady granulations at the angle of the whorl, the upper row 

 being the strongest and occupying the salience of the whorl ; (3) the 

 body-whorl developes an anterior row of beady granulations in 

 addition to the preceding. Suture moderately close. Base spirally 

 granulate. Other indications wanting. 



Relations and Distribution. — The granulated character of the 

 ornaments and to some extent their arrangement serve to connect 

 this shell with section B. of Deiphinida granata. On the whole, 

 however, its truly conical outline, closer suture, and the double row 



