273 
The external characters of this shell resemble those of 
_ Nerina implicata, D’Orz., and the internal characters approxi- 
~ mate closely to those of that shell, as also to N. bacillus, D’Ors., 
and N. Trachea, Dest.; they do not however quite agree with 
those species. In N. implicata and N. bacillus the posterior 
fold on the outer wall is broad and angulated, in N. complicata it 
is narrow and rounded at the end. The fold next below, which 
_ isalmost obsolete in N. complicata, is acute and deep in the 
_ two other species; the anterior fold is bifurcated in N. compli- 
_ cata, in the other species it is angulated only. There are also 
differences in the folds on the columella; in N. complicata the 
posterior fold is strongly bifurcated, in the other species it is 
_ merely angulated; the middle fold is angulated, in N. bacillus 
- itisa round knob, larger than its base. WN. trachea differs in 
having simple folds on the columella, and the posterior fold 
on the outer wall bifurcate. 
Locality.—Tiltup’s End, near Nailsworth, in the Great 
— Oolite, where it is abundant. 
Nerivza (Trocwaria) Evpesu. Pl. IV., fig. 3, 3a, 3b, 3¢ 
Nerinea (Trochalia) Eudesti, Mor. & Lyc., G. Ool. Mon. 
Pl. 7, fig. 6 
This shell is figured and described by Morris and Lycerv, 
the figure drawn is that of a young form. It is described as 
_turreted, conical, excavated, whorls (ten) concave, narrow, with 
numerous transverse lines, sutures carniated, carnize elevated and 
smooth, base flattened, canal short, aperture sub-quadrate. It 
issaid to be rare. The internal characters were not fully known 
to the authors, but as far as they could observe them they 
described the outer lip as simple, the columella plicated with 
one fold, and the upper portion of the volution having a very 
slight fold. 
The external description given is correct, but Morris and 
adult shell, which cannot be less than seven inches in length. 
The internal structure as described is inaccurate. The shell 
has a columella imperforate, with a blunt rounded fold upon it, 
