172 GASTEROPODA OF THE INFERIOR OOLITE. 
Géol. France, 2” sér., vol. 14 (1857), pl. v, fig. 16, &., p. 547), has a certain 
resemblance. This species, according to Cossmann, has many synonyms (‘ L’Etage 
Bathonien,’ p. 94), and is far from being uncommon in the Bathonian of North- 
East France. OC. attritwm is tolerably abundant at Weldon, but it is rare to find 
a specimen of the size figured. 
101. CrrirHtum appas, sp. nov. Plate X, figs. 10 a, 10 b, 10 ¢. 
Description : 
Length of a good-sized specimen : . 60 mm. 
Width of same : 5 : . 14mm. 
Spiral angle ‘ . 16°—18°, 
Shell elongate, turrited ; spiral ea regular. aon sixteen to twenty, flat, 
about twice as wide as high, suture close. The posterior whorls are not turrited, 
and increase as an elongated cone; lower down a shoulder is developed on the 
upper part of each whorl, which gives this part of the shell a turrited aspect. 
The ornaments consist of numerous spiral lines of unequal strength, thick or thin 
lines frequently alternating ; towards the shoulder one or two lines are stronger 
than the rest, giving a slight appearance of a zone or girdle. 
The body-whorl is sub-cylindrical, and with ornaments similar to those of the 
spire, except that in some specimens the rugosities due to increase are very 
strongly marked. The base is full, rounded, and finely striated spirally. Aper- 
ture ovate-elongate, with a considerable callus on the columella. Anterior canal 
well developed, elongate, and slightly reflexed. In section the whorls are ovate- 
elongate, both outer and inner walls being rather thick. 
Varieties—In some specimens the whorls, instead of being flat, are subconvex, 
and almost without any shoulder; in this variety the body-whorl is not so 
cylindrical (B). Not figured. 
In another variety, which occurs at Beaminster, the conical outline of the 
earlier whorls is maintained throughout, so that there is no turriting whatever, 
the sutures lying in a sulcus or groove; there is also a slight belt at the anterior 
margin of each whorl (C). Almost a distinct species. Not figured. 
Relations and Distribution.—Hitherto I have failed to find any species in the 
Inferior Oolite of Normandy which appears to possess any relationship to the 
shells above described. Cerithiwm abbas has been at times taken for a Nerinea, 
and I believe that it has been so marked in collections. However, the longitu- 
dinal section shows that the resemblance to Nerinwa is external rather than 
internal. It is placed provisionally under Cerithium until a suitable genus is 
provided for it and similar shells. Cerithiwm abbas is tolerably abundant in the 
