FROM THE GREAT OOLITE. 337 



specimens from this rock often attain a considerable size ; the flattened varieties are the 

 largest, and the pyramidal tlie smallest. I have collected this species from the upper zone 

 of the Inferior Oolite at Rodborough, Birdlip, and Shurdington Hills, and from Hampen, 

 Naunton, and Stow-in-the-Wold, Gloucestershire ; from the Stonesfield Slate at Seven- 

 hampton, Eyeford, and near Pewsdown; from the Great Oolite of Minchinharapton, 

 Salperton, and near Cirencester ; from the Forest Marble near Trowbridge ; from the 

 Cornbrash near Cirencester, Gloucestershire ; and from Chippenham and Trowbridge, 

 Wilts. Mr. Hull has collected it from that formation near Shilton, and Mr. Gavey near 

 Woodstock. The Rev. A. W. Griesbach has collected the finest specimens I have seen 

 from the Cornbrash at Rushden, Northamptonshire, where they attain a very large size 

 (fig. 1 a, k), and are found in excellent preservation. Messrs. Bri^tow and Gapper, of the 

 Geological Survey, collected specimens in abundance from the Cornbrash of Dorset, and I 

 have likewise found it in the same rock at Gristhorpe Bay, and Scarborough, Yorkshire. 

 It forms, therefore, a very characteristic urchin of the upper portion of the lower division 

 of the Oolitic series, extending without interruption from the zone of Ammonites 

 Farhinsoni to the uppermost beds of the Cornbrash; a practised eye, however, can 

 readily detect the varieties which are gathered from the Inferior Oolite, Great Oolite, 

 and Cornbrash; the Inferior Oolite forms are usually large and depressed, the Great 

 Oolite small and dwarfed, and the Cornbrash the largest and best developed of the series. 



The foreign distribution of this species, according to M. Desor, is Calcaire a Polypiers 

 (Bathonien) de Ranville, Forest-Marble de Chatel-Ceusoir (Yonne), VesuHen du Hornussen, 

 Kreisacker, Wolfliswyl et Frick (Argovie), Meltingen. (Canton de Soleure), Maiche 

 (Doubs). 



It was collected in abundance by M. Triger from the Great Oolite (department of the 

 Sarthe) at "La Jauneliere (tuilerie), Domfront (four a chaux), Conlie, Monne, Saint- 

 Christophe, route de Mamers a Marolette, Aubigne (ferme de Gesnes-le-Gaudelin), 

 Pecheseul, Noyen, Saint-Pierre-des-Bois, route de Contilly a la Perriere." 



Table of M. Triger, Bradford Clay, Ass. Nos. 1, 2, and 3, and Forest Marble, Ass. No. 4. 



B. Species from the Great Oolite. 

 EcHiNOBRTSsus WooDWARDii, Wright. PL XXIV, fig. 2 a, b, c, d, e. 



NucLEOLiTES WooDWAKDii. "Wright, Annals and Magazine of Natural History, 2d series, 



vol. 13, p. 161, pi. xii, fig. 5 a — e, 1852. 

 — — Forbes, in Morris's Catalogue of British Fossils, 2d ed., 



p. viii, ad. sp. 



EcHiNOBKissus WooDWARDii. Desor, Synopsis des Echinides Fossiles, p. 268. 



Test thin, sub-quadrate ; sides tumid ; dorsal surface flatly convex ; anal valley deep. 



