64 MOLLUSCA FROM THE GREAT OOLITE. 



T. Testa conicd; anfractibus tribus lavibus, lateribus planis; umbilico nulh; aperture! 

 depresso-ovatd. 



Shell conical; whorls (3) smooth, the sides flattened, no umbilicus; aperture de- 

 pressed, ovate. 



Possibly this may be the young of T. ylaber, Dunker ; the only apparent difference 

 between them being, that T. obsoletus has a base wider in proportion to the height, and 

 that the upper margins of the whorls are somewhat tumid, causing the sides to appear 

 less flattened. 



Locality. It is moderately common to all the shelly beds near Minchinhampton. In 

 the Stonesfield slate of Wagboro' Bush {Bucbnan). 



Turbo, Linnaus, 1758. 



Shell thick, ventricose, turbinated, usually sculptured or tuberculated ; spire short; 

 aperture usually rounded, entire, somewhat spread out anteriorly. 



Turbo Hamptonensis. Plate IX, figs. 30, 30a, b. 



T. Testa parvd, turbinatd; anfractibus (4) convexis, costulis (4) granulatis elatis cinctis; 

 aperturd orbiculatd; umbilico parvo. 



Shell small, turbinated ; whorls convex (4), turreted, encircled by four ribs, which are 

 elevated and closely granulated ; the aperture is nearly round ; the umbilicus small. 



Locality. A single, good example from the planking of Minchinhampton Common is 

 all we have seen. 



Turbo elaboratus. Bean, ms. Plate IX, fig. 27. 



Turbo elaborates, Lycett. 1850. Annals of Nat. Hist., vol. vi, p. 416, pi. 11, fig. 1. 



T. Testa conoided; anfractibus (4 — 5), superne planatis, infer ne subconvexis, et costatis; 

 costis maynis lonyitudinalibus numerosis et elatis, lineisque transversis decussatis; aperturd 

 ovatd; umbilico nullo. 



Shell conoidal; whorls (4 — 5), their upper borders flattened or nearly horizontal, 

 smooth ; their lower portions slightly convex, with numerous elevated large, longitudinal 

 costse, decussated by numerous, closely-arranged transverse lines ; aperture oval ; no 

 umbilicus. 



Locality. The planking of Minchinhampton Common and white stone of Bussage 

 have furnished this species, but it is rare at both localities ; it has, likewise, been 

 obtained from the middle division of the Inferior Oolite in the same district, and occurs 

 also in the same formation in Normandy. 



