382 GASTEROPODA OF THE INFERIOR OOLITE. 



319. Trochus squamosior, sp. nov. Plate XXXII, fig. 5. 



Description : 



Height . . . . .9 mm. 



Width . . . . .9 mm. 



Spiral angle ..... 65°. 



Shell conical, not umbilicate ; spiral angle slightly concave. Spire acute, 

 sutures close. Number of whorls seven, flat, those at the apex without ornament ; 

 the three succeeding whorls carry from two to three tuberculated and subsquamose 

 spirals. The penult has four spirals, of which the third is the least prominent. 



The body-whorl has five spirals, of which the middle one is the weakest. All 

 the spirals of the anterior whorls are armed with hollow spinous projections, the 

 hollow inclining to the anterior side; the last spiral, constituting the basal 

 periphery, is turned backwards. Base flat and smooth. Aperture rhomboidal and 

 depressed. 



Relations and Distribution. — Although possibly only a sport of the local 

 representative of T. subluciensis, yet the wider spiral angle and tendency to a 

 concave spire are indications which may be relied on, even when the exceptional 

 preservation of the spines, exhibited in the figured specimen, is wanting. 



Rare in the " Base-bed " at Lincoln. I have seen something like this form on 

 a small scale in Mr. Walford's Collection from Hook Norton. 



320. Trochus squamigbb, Morris and Lycett, 1851, Inferior Oolite variety. 



Plate XXXII, fig. 8. 



1851. Trochus squamiger, Morris and Lycett. Great Ool. Moll., pt. 1, p. 62, 



pi. ix, fig. 34 ; pi. xiii, fig. 7. 



Description : 



Height ..... 6*3 mm. 



Width . . . . .7 mm. 



Spiral angle .... 68°. 



Shell regularly conical, imperforate. Spire elevated and acute, though the 

 actual apex is slightly obtuse. Number of whorls six, perfectly flat and increasing 

 regularly ; sutures close. The ornaments consist of spiral bands distinguished by 

 nodules which are squamosely tubular and excavated on the anterior side. On the 



