106 MOLLUSCA FROM THE GREAT OOLITE. 



whom it is dedicated. The cast of a shell figured by Goldfuss, t. 173, fig. 3, under the 

 name of Buccimim antiquorum, from the dolomitic Oolite of Bavaria, may possibly belong 

 to an allied species of the same genus. 



Locality. Minchinhampton Common, in the beds of planking. 



Neritopsis varicosa. Plate XI, figs. 20, 20a; Plate XIII, fig. 5. 



N. Testa neritiformi, ovato-oblongd, varicibus magnis longitudinalibus (circa 10 in 

 ambitu) , plus minusve elatis, et lineis numerosis, transversis, regularibus, elatis decussatis; 

 lineis cum striis densissimis perpendicalaribus instructis. 



Shell neritiform, ovately oblong ; varices large, longitudinal (about 1 in a volution), 

 more or less elevated, decussated with numerous regular, elevated, and transverse lines ; 

 the lines are impressed with extremely fine and dense perpendicular striae ; the aperture 

 round. 



A very thick ovate shell; the varices vary much in magnitude, so that in some 

 specimens they are nearly obsolete, but the large encircling lines are always conspicuous ; 

 the dense striations upon the lines are only visible under a magnifier. 



Locality. Minchinhampton Common, where it is rare ; but it occurs not unfrequently 

 in the middle division of the Inferior Oolite. 



Trochus spiratus, jyArchiac. Plate XIII, figs. 6, 6a. Plate X, figs. 2, 2a, 2b. 



Trochus spiratus, Archiac. 1843. Mem. Soc. Geol. de France, torn, v, p. 378, t. 29 

 fig. 4a — c. 



— — Bronn. 1848. Index Palaeont., p. 1306. 



— — UOrb. 1850. Prod. Paleont., p. 300. 



T. Testa conicd, apice acuto, anfractibus (4 — 5) lateribus planis, subter medio sub- 

 angulalis, cingulis et lineis ornatis ; cingulis duobus, primo prope suturam approximato, 

 secundo majori, acuto, parte inferiore anfracluum sito ; lineis inter cingulos striis longitudi- 

 nalibus impressis ; basi Icevi subconvexd, iimbilico nullo. 



Shell conical, apex acute, whorls 5, their sides flattened, somewhat angulated 

 beneath their middle portions, and encircled with bands and lines ; the bands are two in 

 number ; the first is wide, flattened, and placed close to the suture ; the second is pro- 

 minent, acute, forming a slight angle, and placed near to the base of the whorls ; between 

 the bands are several rather obscure encircling lines, which are indented by longitudinal 

 striae ; base smooth, slightly convex ; no umbilicus. 



The variation in the prominence of the bands, of the lines, and of the general state of 

 preservation, occasions considerable diversity in the aspect of this species, and requires 



