366 GASTEROPODA OF THE INFERIOR OOLITE. 



The body-whorl is large, angular, and sub-bicarinate, the widest part being at 

 the upper keel, but the difference in width between the upper and lower keel varies 

 considerably. The keels are richly granulated, the granulations in the lower keel 

 being smaller, and the whole surface of the shell is covered by an interlacing 

 network of spiral and radial striae, the umbilicus being encircled by a row of 

 prominent tubercles rather wide apart. Aperture sub-rhomboidal to circular ; 

 umbilicus funnel-shaped and deep. 



Relations and Distribution. — There is much variety in the shells classed under 

 Turbo Shaleri, chiefly owing to the difference in the amount of exposure in the 

 penultimate — thus producing a figure very different to that of the specimen 

 selected (fig. 12). It is obviously a member of the Granata -group, especially 

 characteristic of the Concavus-bed, Bradford Abbas. Quoted from Dundry by 

 Tawney, where specimens seem to be less highly ornamented. 



301. Delphinula, species or variety. Plate XXX, fig. 13. 



The specimen figured in the accompanying plate differs so considerably, both 

 from Turbo Shaleri and also from the other members of the Granata-growp, 

 described below, as to be worthy of notice. The opening of the spiral angle is 

 about 115°, the body- whorl is equally bicarinate, and the ornaments are very fine, 

 except where a circle of elongated tubercles borders the wide and funnel-shaped 

 umbilicus. 



The specimen is believed to be from the Inferior Oolite of the Dorset district 

 and is unique. As a mere name of convenience I would distinguish it as Delphinula 

 " densistriata." In shape, but not in ornamentation, it has some resemblance to 

 Turbo Theodori (Goldf., 1. 179, 1). 



302. Delphinula Shaleri, var. pdlchrior. Plate XXX, fig. 14. 



Description : 



Height . . . . .12 mm. 



Width . . . . .16 mm. 



Mean spiral angle about . . .85°. 



Shell turbinate, moderately umbilicated, spire fairly elevated, ranging from 



more than one-third to less than one-half the total height ; apex flattened, 



apical whorls smooth. Number of whorls five, concave, and ornamented by tuber- 



