486 W. H. Hudleston—The Yorkshire Oolite. 
any of the undermentioned species, thus raising the total number to 
about eight or nine. 
Besides the more common narrow and cylindrical forms, there 
occurs in the Coral Rag of certain localities a very curious group 
already noticed by D’Orbigny as not uncommon in the Corallian of 
the Hast of France. This group, he observes, constitutes a sort of 
passage between the Nerinzeas and the Actzons, having the outward 
form of the latter, but the internal structure of the former. The 
occurrence of this group in Yorkshire was first indicated by publica- 
tion in the “Corallian Rocks of England.”! It is just possible that 
the three species now figured and described pass into each other by 
various gradations. 
25.—NERIN/EA FustFoRMis, D’Orbigny, 1847. Plate XVI. Figs. 7a, b. 
Nerinea fusiformis, D’ Orbigny, 1847, Prod. de Pal. Strat. vol. i. p. 6. 
Idem, 1850, Terr. Jurass. yol. ii. p. 101, pl. 257, figs. 3-3. 
Bibliography, etc. —This species, originally discovered by M. 
Cotteau in the Department of the Yonne, is not generally quoted by 
continental paleontologists. It does not appear, for instance, in the 
very full list given by Buvignier of species found in the Coral Rag 
of the Meuse (op. cié. p. 54). Brauns does not find it in North 
Germany, and as he does not quote it as a synonym of the next 
species, we may presume that the form bas not been observed. 
Neither this nor any of the group appear in De Loriol and Pellat’s 
work on the Upper Jurassic rocks of Boulogne. 
Description.—Specimen from the Corallian of Yorkshire (Leck- 
enby Collection). 
OWN oe te oe soa do Nd sa hse aa sososa 70H: 66 millimétres. 
SWitd Gla I fo ds deh cbeacio ised eRe et kolo RICO eee WG) 55° 
Length of last whorl to entire shell .......... 39 : 100 
S)OEN EVANS, OVEWAIE® cs 55o0ncencccccasboocac 21°. 
D’Orbigny’s description fits this shell so well that I cannot do 
better than transcribe it. ; 
“Shell elongated, fusiform, not umbilicated. Spire formed of a 
convex angle composed of whorls almost flat or slightly convex, 
smooth, or merely marked with some lines of growth. The last whorl, 
which is very large, is convex in front without angles or keels. 
Aperture elongated, compressed ; furnished with three simple folds: 
one on the lip, two on the columella, all scarcely marked.” 
Relations and Distribution.—If we may accept the silence of most 
paleontologists as conclusive, this particular form has, on the Conti- 
nent, been noted only in the Corallian of the Yonne. A variety 
somewhat intermediate between this and the species next described 
1s very abundant in the Coral Rag of Brompton (see Pl. XVI. Figs. 
10 and 11), where such rolled and fragmentary specimens may often 
be picked up, though on the whole the Brompton shell has, perhaps, 
more affinities with N. Moreana. Casts of this or of an allied 
species occur at Upware in the Coral Rag. 
1 Q.J.G. 8. vol. xxiii. p. 328. 
