428 GASTEROPODA OF THE INFERIOR OOLITE. 



teristic of the Ornatas, being related on one side to the turrited, and on the other 

 to the depressed forms. 



The best specimens are from the Parhinsoni-zone of Burton Bradstock, where 

 also the var. dentata occurs. From the Humphriesianus-zone at Bradford Abbas I 

 have a specimen something between PL armata var. precatoria, and PL Sauzeana, 

 d'Orb. Smaller and less characteristic specimens of PL armata are found in the 

 Sauzei-bed of the Sherborne district and at Louse Hill, both in the Humphriesianus- 

 zone. 



369. Pleurotomaria, cf. Sadzeana, d'Orbigny, 1850. Not figured. 



1850. Pleueotomaeia Sauzeana, d'Orbigny. Prod., i, p. 267. 



1854. Terr. Jur., vol. ii, p. 457, pi. 



ccclxxiii. 

 1873. — — — Tawney, Dundry Gasteropoda, 



p. 51 (43). 



Specimens referred to this species do not quite fit in with the description and 

 figure in the ' Terrains Jurassiques.' Yet there are specimens from Dundry 

 reaching up to 90 mm. in height, which approach more nearly to PL Sauzeana 

 than to the most elongate varieties of PL armata. The fineness of the nodulations 

 in PL Sauzeana is one characteristic feature. I have already alluded to the 

 specimens from the Irony Bed of Bradford Abbas (Humphriesianus-zone). These, 

 together with the Dundry specimens, are distinguished in my Collection as PL 

 " sub-Sauzeana. ,, 



370. Pleurotomaria tuberculosa, Def ranee, 1826. Plate XXXVII, figs. 4 a, 4 b. 



1826. Pleueotomaeia tubeeculosa, Defiance. Diet. Sci. Nat., vol. xli, p. 382, 



pi. lxxxvi, fig. 3. 

 1854. — Morris, Cat., p. 272 (I. O., 



Bridport). 

 Syn. oenata, Deslongchamps (especially var. sitlcifeea). Vol. 



cit., p. 37, pi. iv, fig. 3. 

 — — D'Orbigny, Terr. Jur., vol. ii, 



p. 449, pis. ccclxvi, ccclxvii. 

 Non. tubeeculosa, Zieten (1830). Verstein. Wiirt., p. 47, 



pi. xxxv, fig. 3. 



Bibliography, 8rc. — Deslongchamps, and after him d'Orbigny, regarded this 

 species as identical with Trochus ornatus, Sow. Tawney (op. cit., p. 49) did not 



