386 GASTEROPODA OF THE INFERIOR OOLITE. 



Trochus Burtonensis, Lye, in the greater flatness of the base and the sharper 

 angles of the basal periphery. Yet some of our Inferior Oolite specimens are 

 scarcely distinguishable from real Bradford Clay fossils. As a mere collection 

 name I suggest var. " Hortonensis." 



I notice this form from the Inferior Oolite of the Hook Norton district. In 

 the Cotteswolds it is chiefly confined to the Parhinsoni-zone and is especially 

 abundant at Horton Hill. 



325. ? Trochus Leckenbyi, Morris and Lycett, 1851. Plate XXXII, fig. 13. 



1851. ? Trochus Leckenbyi, Morris and Lycett. Great Ool. Moll., pt. 1, p. 115, 



pi. xv, fig. 21. 



1885. — — — Hudleston, Geol. Mag., dec. 3, 



vol. ii, p. 126, pi. iii, fig. 7. 



Bibliography, Sfc. — The authors appeared to have had a suspicion that this was 

 a Pleurotomaria, although nothing upon the surface of the whorls indicated that 

 such was the case. 



Description : 



Height . . . . .15 mm. 



Width . . . . .17 mm. 



Spiral angle ..... 85°. 



Shell conical, imperforate. Spire regular and about half the entire height. 

 Number of whorls five, nearly flat ; suture rather close. The ornaments consist 

 of stout granulated spiral bands, those towards the base of each whorl having a 

 slight prominence. 



The body- whorl shows a slight prominence at the basal periphery. Base nearly 

 flat, with strong spirals decussated by radiating lines. Aperture trapezoidal and 

 depressed. 



Relations and Distribution. — Probably a Pleurotomaria with the sinus-band 

 obscured. A single specimen from the Scarborough Limestone. 



326. Trochus biarmatus, Munster, 1844. Plate XXXII, fig. 14. 



1844. Trochus biarmatus, M. G-oldf., Petref. Germ., pi. clxxx, fig. 2. 

 1873. Littorina biarmata, M. Tawney, Dundry Gasteropoda, p. 24 (16). 

 Cf. also Trochus bitorquatus, Reb. and I)esl. Foss. Montreuil-Bellay, p. 61, 



pi. ii, fig. 6. 





