THE 
GEOLOGICAL MAGAZINE. 
NEW SERIES. DECADE II. VOL. VII. 
No, XI—NOVEMBER, 1880. 
ORIGINAL ARTICUiIMS. 
J.—Contrisurions to THE PaLmonTOLOGY oF THE YORKSHIRE 
OourTEs.' 
Parr IV. 
By Witrrm H. Huptzsron, M.A., F.G.8., V.P.G.A. 
(PLATE XVI.) 
Group allied to CEerrratum LimmFormE, Roem., 1836. 
Plate XVI. Figs. 1-38. 
Cerithium limeforme, Reem., Ool. Geb., tab. xi. fig. 19, p. 142. 
Bibliography, etc.—This is just. one of those cases where it is so - 
difficult to choose between accepting names for forms which, though 
allied, are distinct, or simply lumping all the forms together under one 
specific designation, which does not exactly fit any of them. Objec- 
tions more or less valid may be urged against either course, and some 
might be disposed to cut the Gordian knot by making new species 
all round. Buvignier went very closely into the varieties of the 
Corallian Cerithia. He points out that the true C. limeforme of 
Reemer occurs rather higher than the Coral Rag, viz. in the “ cal- 
caire & astartes,” to which it is restricted. It is characterized by 
three rows of transverse granulations, just as shown in Reemer’s 
enlarged figure, though at times a fourth or even a fifth very faint 
one is developed. It is difficult to say of what value these refine- 
ments may be, but certainly C. limeforme, as thus restricted, cannot 
be exactly identified in the Corallian of Yorkshire, where its place 
is occupied by forms slightly different, though in our collections they 
have been generally lumped together under the heading C. lime- 
forme, Roemer. 
In North Germany, Brauns is disposed to take the same view, 
and he regards Buvignier’s Coral Rag species, C. grandineum and 
probably C. Humbertinum, as identical with Roemer’s species. Never- 
theless it is curious that forms something very like these, though not 
exactly, do occur in our Coral Rag. The three following have been 
selected for illustration, and correlated approximately. 
19.—Crriruivm near to LimarormE, Roem., as restricted by Buvignier. 
Pl. XVI. Figs. la, 6, ¢. 
Cerithium limeforme, Roem., Buvignier, Stat. Géol. de la Meuse, p. 41, pl. iv. fig. 3. 
Description.—Specimen from the Coralline Oolite of Ness (my 
Collection). 
TOCHPEUAD SS. ais). ste bhold Loh eoSened «ess settee a 11 millimétres. 
\ AGS RS ee ee AYE See LE Br Bros 
SSMUM EO ee wie ohn elahn (atfiate tae taste ge le ale Convex. 
1 Continued from the September Number, p. 404. 
DECADE II.— VOL. VII.—NO. XI. 31 
