TROCHUS. 383 
body-whorl these spirals are four in number. Base flat, with a crenulated margin 
and delicate spiral ornamentation (rarely preserved). 
Relations and Distribution.—The Inferior Oolite variety is more perfectly 
conical and wider than the Minchinhampton one. Obviously related to 
T. squamosior, this species never exhibits the deflected basal periphery. 
Rare in the Oolite Marl horizon near Nailsworth. 
321. TRocuus vicinus, sp. nov. Plate XXXII, fig. 9. 
Description : 
Height F : : ‘ 2.6 mm: 
Width ; 2 ‘ é 2 4 mm: 
Spiral angle . : ae 
Shell regularly conical, imperforate. Spire acute and nearly two-thirds of the 
total height. Number of whorls seven, flat; those near the apex probably plain ; 
sutures distinct. Anterior whorls of the spire ornamented with four granular 
spirals, the posterior of which contains the strongest nodulations. 
In the body-whorl the first and third spirals contain the largest nodulations ; 
the fourth spiral is often split, and the basal periphery is prominent. Base 
moderately flat and smooth. Aperture subquadrate with a columellar furrow. 
Relations and Distribution.—In spiral angle and general outline this species 
greatly resembles 7’. monilitectus, from which it is chiefly distinguished by its more 
varied spiral ornamentation, and by a fuller base and less depressed aperture. I 
have not been able actually to identify this form with any from the Lower Oolites of 
the east of France, although it seems to run into forms not very unlike T’rochus 
Bellona, @ Orb. 
Common in the Lincolnshire Limestone at Weldon, where the varieties are 
numerous ; occasionally met with in the Parkinsoni-zone of the Cotteswolds. 
322. Trocaus Dunxkeri, Morris and Lycett, 1851, var. Weldonis. Plate XXXII, 
fig. 10. 
1851. Trocnus Dunxert, Morris and Lycett. Great Ool. Moll., pt. 1, p. 61, 
pl. x, fig. 3. 
Description : 
Height and width about : f . =? mom. 
Spiral angle . ‘ : : Leo 
