﻿AMBERLEYA. 279 



It does not occur in the Inferior Oolite proper, and may on the whole be viewed as 

 a Liassic form. 



209. Amberleya ornata, Sowerby, 1819. Plate XXI, figs. 13, 14, typical ; fig. 15, 



var. spinulosa, Miinst. ; figs. 16, 17, 

 18, and Plate XXII, fig. 1, var. 

 abbas; fig. 2, var. horrida. 



1819. Tuebo obnatus, Sow. Min. Conch., pi. ccxl, figs. 1, 2. 

 1844. — spinulosus, Miinst. Goldf., Petref., pi. cxciv, fig. 3. 

 1852. Pubpubina Bathis, d'Orb. Terr. Jur., vol. ii, pi. cccxxx, figs. 6 — 8. 

 1854. Littobina ornata, Sow., sp. Morris, Cat., p. 255. 



1873. Amberleya obnata, Sow., sp. Tawney, Dundry Gasteropoda, p. 27 (19), 



pi. i, fig. 9. 



Non Tuebo obnatus, Sow., sp. G-oldfuss, nec d'Orbigny. 



Bibliography, Sfc — It would not be difficult, perhaps, to fill a page with 

 references to " Turbo " ornatus under the heading Turbo, Purpurina, Eucyclus, or 

 Amberleya. Owing to the very poor figures given in the ' Mineral Conchology ' 

 most foreign authors have been mistaken in their attempts to identify Sowerby' s 

 species. The Turbo ornatus, Sow., of Goldfuss is rather like an Oxfordian 

 member of the ornata group described and figured by me in 1884 (' Geol. Mag.,' 

 dec. 3, vol. i, p. 247, pi. viii, fig. 8) as Amberleya clavata, Bean, MS. On the 

 other hand, the Purpurina ornata of d'Orbigny's identification (' Terr. Jur.,' 

 vol. ii, pi. cccxxx, figs. 4, 5) is a well-known species characteristic of the Upper 

 Division of the Inferior Oolite (vide Amberleya Orbignyana, page 285). 



Mr. Tawney regarded Turbo capitaneus doubtfully as a synonym. 



Description : 



Length from about . . . 25 — 50 mm. 



Height of body-whorl to total length . say 50 : 100. 



Spiral angle .... 50°. 

 Shell eucycloid, turrited. Whorls from seven to nine, angular and narrow, 

 the slope of the posterior area broken by a slight spiral band near the suture ; 

 suture almost gaping. 



The ornaments consist of three tuberculated spirals, of which the upper one 

 recedes and is sometimes rather faintly developed. The tuberculations are drawn 

 out spirally, and vary much in force. The interspiral cross-hatchings are fine 

 and numerous. The body-whorl is large and angular, with two prominent 

 tuberculated spirals and one posterior spiral, which is often only faintly crenulate. 

 In the base are five spirals scarcely tuberculated, with fine and numerous inter- 

 spiral striae. 



