W. S. HucUeston — On the Torkshire Oolites. 195 



Inferior Oolite of Bradford Abbas and of Normandy and the Cal- 

 lovian of Montreuil-Bellay seem to be the head-quarters of this 

 group of small and well-marked shells, of which there ai"e two 

 species or varieties in the Yorkshire beds now under consideration. 



2. — PuKPURiNA ELABORATA, Bean, Morris and Lycett, 1850, var. 

 Bajocensis. Plate V. Fig. 2. 



1850. Turbo elaboratus, Bean MS. ; Morris and Lycett, Gt. Ool. Moll., Part 1, 



p. 116, pi. XV. fig. 2. 

 1869. Furpurina elaborata, Bean ; Brauns Mitl. Jura, p. 168. 

 1875. Turbo elaboratus, Bean; Phillips, G. Y., 3rd edition, p. 259. 



Bibliography, etc. — This specimen was described by Morris and 

 Lycett from Gloucestershire {op. cit. p. 64, pi. ix. fig. 27) as well as 

 from Yorkshire specimens. The Gloucestershire specimen is in an 

 excellent state of preservation, and may be seen at the Museum in 

 Jermyn Street. It comes from the Great Oolite, and may be re- 

 garded as a distinct variety. The Yorkshire specimen is from the 

 Scarborough Limestone (zone 3), and is only indifferently preserved. 

 The type is in the Bean Collection at the British Museum. In 

 describing this latter specimen (p. 116) the authors observe that 

 "the base is rounded, so that it neither exhibits the thickened lip of 

 Littorina, nor the basal produced form of Turbo.'''' It is clear, there- 

 fore, that the generic position of T. elaboratus must have been re- 

 garded as somewhat uncertain. The shell described below, though 

 not exactly similar to either of the types, is sufficiently near to be 

 placed with them. 



Description. — Specimen from the Dogger (zone 1) Peak (Blue 

 Wyke). Leckenby Collection. 



Length (restored) 16 ram. 



Width 12 ,, 



Eatio of body-whorl to entire shell 62 : 100. 



Spiral angle , 75". 



Shell turrited. Whorls 4-5, body-whorl tumid. Upper area of 

 whorl flattened, and slightly sloping forwards. Strong longitudinal 

 {i.e. transverse according to some authors) ribbing decussated spirally 

 so as to produce nodes on the ribs — a characteristic of this group 

 and eminently so of this variety. The ribbing is not carried quite 

 down to the base of the shell. 



N.B. — In this specimen the decussation of the ribs in the whorls 

 of the spire is altogether obliterated, except in the penultimate, where 

 it is slightly shown. 



Relations and Distribution. — This form, or something very like it, 

 is sparingly but widely distributed throughout portions of the In- 

 ferior Oolite. At Bradford Abbas, which may be regarded as the 

 head-quarters of this group of univalves in the English Bajocian, is 

 a Pwpurina, far from common, which serves to connect this variety 

 with F. bellona, regarded as the type of the genus.^ So that F. bajo- 

 censis and P. bellona are not so far removed as might be imagined. 



^ There are several species of Furpwina in the Inf. Ool. of Bradford Abbas. The 

 most common is a very coarsely marked shell, hitherto unnamed, as far as I know. 



