GASTEROPODA. 65 



Turbo Sharpei. Plate IX, figs. 28, 28a. 



T. Testa conoided; anfractibus (4) convewis, gradatim tumescentibus, suturis prof wide 

 impressis; anfractibus lineis elatis aqualibus, longitudinalibus et regidaribus ornatis, aliis 

 transversis decussatis; lineis transversis superne distantibus, inferne approximatis ; aperturci 

 ovatd; umbilico nullo. 



Shell conoidal ; whorls (4) convex, gradually increasing in size, their sutures deeply 

 impressed ; the surface of the whorls is ornamented with numerous equal and regular lon- 

 gitudinal lines, tranversely decussated by others of equal size; the transverse lines are 

 arranged distantly upon the upper portions of the whorls, but more nearly upon the lower ; 

 aperture oval ; no umbilicus. 



Both descriptions of lines are scarcely discernible, except upon the last volution, where 

 they are prominent ; but the lower portion of this whorl is destitute of the longitudinal 

 lines, which extend over only the upper half. 



The general figure differs from Turbo elaboratus (Plate IX, fig. 27), in the more gradual 

 increase of the whorls, which are likewise more convex, and have not the distinct sulcus 

 or area upon their upper portions, nor the large elevated costse ; these distinctive features 

 have been faithfully delineated by the artist. The longitudinal lines are equal in size to 

 those which are transverse, forming a simple cross-barred* surface. 



Locality. It is rare ; but has been found both at Bussage and Minchinhampton 

 Common. This species is dedicated to D. Sharpe, Esq., F.R.S. 



Turbo pygm^eus. Plate IX, figs. 29, 29a. 



T. Testa parvd, conicd; apice obtuso; anfractibus (4 — 5) planatis, costis longitudi- 

 nalibus tiumerosis {circa 16 in ambitu), cum punclis inter stitialibus ornatis; aperturci 

 depressd. 



Shell small, conical, apex obtuse; whorls (4 — 5) flattened, ornamented with numerous 

 longitudinal ribs (about 16 in a volution), the interstitial spaces being closely and deeply 

 punctated ; aperture depressed. The costae are large and equal ; their continuity is inter- 

 rupted by a narrow, encircling band at the base of each whorl ; the height of the entire 

 shell is somewhat greater than its transverse diameter at the base ; the exact character of 

 the mouth not being exposed, it is placed only provisionally in the genus Turbo. 



Locality. Minchinhampton Common, at which place it would seem to be rare. 



Turbo capitaneus, Goldf. Plate IX, figs. 33, 33a. 



Turbo capitaneus, Goldfuss. 1842. Petref., iii, p. 97, t. 194, fig. 1. 

 — — Bronn. 1848. Index Palseont., p. 1318. 



