420 GASTEROPODA OF THE INFERIOR OOLITE. 



A specimen in my collection answering well to the description and figures, as 

 quoted above, has a height of 80 mm. and a spiral angle of 50°. The shell is 

 acutely conical, and scarcely umbilicated. The whorls are subconvex to flat, but 

 well marked off by the suture. The body-whorl is angular at the basal periphery, 

 and the base nearly flat. In the early whorls the ornaments are finely reticulate, 

 becoming smooth in the adult stage. Sinus-band quite median, broad and very 

 flat in the later whorls. 



One specimen from the Parkinsoni-zone of Burton Bradstock. 



360. Pleurotomaria subfasciata, d'Orbigny, 1850. Plate XLIV, fig. 10. 



1850. Pletjeotomabia subfasciata, d'Orbigny. Prod., i, p. 269. 



1854. — Terr. Jur., vol. ii, p. 500, 



pi. cccxciv, figs. 1 — 3. 

 Svn. fasciata, var. ceenata, Deslongchamps. Vol. cit., p. 53, 



pi. vi, fig. 1. 



This is so well marked a form as to present little difficulty in identification. A 

 specimen, believed to have come from the Humphriesianus-zone of the neighbour- 

 hood of Sherborne, has a height of 75 mm. and a spiral angle of 62°. It differs 

 from Normandy specimens, as described, in having no umbilicus. PL subfasciata 

 (cmiatit is more descriptive) helps to connect the Fasciatas with the still more 

 numerous section of the Ornatse. 



361. Pleurotomaria phyospira, cVOrbigny, 1850. Not figured. 



1S50. Pleueotomaeia phyospiea, cTOrbigny. Prod., i, p. 269. 



1854. — Terr. Jur., vol. ii, p. 502, 



pi. cccxcv. 

 Syn. — fasciata, var. phyospiea, Deslongchamps. Vol. cit., p. 53, 



pi. v, fig. 4. 



A large but somewhat imperfect specimen, nearly 100 mm. in height, from the 

 Humphriesianus-zone of the neighbourhood of Sherborne may, without doubt, be 

 referred to this very characteristic form. Mr. Wilson has also found this species 

 in the Iron-shot Oolite of Dundry. The shell is conical and subturrited, the 

 earlier whorls being angular and carinated, with nodular ornaments on the carinas ; 

 the lower whorls are smooth and tumid, and in harmony with the gyrocycloid 

 forms of the Fasciatse. This species constitutes another link between the Fasciatas 

 and the Ornatos. 



