AMBERLBYA. 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, Mimst.; figs. 16, 17, 
18, and Plate XXII, fig. 1, var. 
abbas ; fig. 2, var. horrida. 
1819. TurBo ornatus, Sow. Min. Conch., pl. cexl, figs. 1, 2 
1844. —  spinunosus, Miinst. Goldf., Petref., pl. exciv, fig. 3. 
1852. Purpurtna Barats, d’Orb. Terr. Jur., vol. ii, pl. eccxxx, figs. 6—8. 
1854. Lirrortna ornata, Sow.,sp. Morris, Cat., p. 255. 
1873. AmprrLeya ornata, Sow., sp. Tawney, Dundry Gasteropoda, p. 27 (19), 
pl. i, fig. 9 
Non Turzo ornatus, Sow., sp. Goldfuss, zee d’Orbigny. 
Bibliography, §e.—It would not be difficult, perhaps, to fill a page with 
references to “ Turbo” ornatus under the heading Turbo, Purpurina, Bucyclus, 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, pl. viii, fig. 8) as Amberleya clavata, Bean, MS. On the 
other hand, the Purpurina ornata of d’Orbigny’s identification (‘ Terr. Jur.,’ 
vol. ii, pl. cecxxx, figs. 4, 5) is a well-known species characteristic of the Upper 
Division of the Inferior Oolite (vide Amberleya Orbigqnyana, 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. 
Spiralangle «500%; 
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 strie. 
