402 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [ Mar, 23, 
The species has some general resemblance to P. similis, Sow., but 
differs in the relative dimensions, the position of the band, and in 
the details of its ornamentation. 
Locality. Lone of Ammonites raricostatus, Bredon. (Coll. Geol. 
Soc. sp. wiicum.) 
DENTALIUM LImATULUM, nov. spec. (Pl. XXVI. fig. 1.) 
Shell small, moderately thick, obtusely triangular, slightly curved, 
ornamented with numerous closely set, regular, slightly oblique, and 
acute coste. 
Dimension. Length 0:5 inch. 
D. angulatum, Buckman, from the zones of Ammonites margaritatus 
and A. zbex, resembles D. limatulum in its ornamentation ; but the 
shell is quadrangular in form, and between three and four times the 
length of the present species. D. decoratum, Miinster, from the 
St.-Cassian beds is similarly ornamented, but the figure is quin- 
quangular. 
Locality. Zone of Belemnites acutus, Cloverly, Salop (Sir BR. 
Murchison). (Sp. unicum; Coll. Geol. Soc.) 
PaTELLA SABRINA, Nov. sp. 
The Rey. P. B. Brodie has submitted to my inspection the cast of 
a large limpet, obtained by him in the superior clays of the Lower 
Lias in the vale of Gloucestershire. Imperfect as the materials at 
my command are, yet they indicate the occurrence of a hitherto un- 
described species of Patella in the Lower Lias. 
Shell very large, turbinate, conical; sides subconvex; apex 
obtuse, central ; base entire, elliptical. 
Dimensions. Height 1:12 inch; diameters of the base 2 and 2°5 
inches. 
CHEMNITZIA CRASSICOSTA, noy. spec. (PI. XXYVI. fig. 6.) 
Shell turreted, elongated ; whorls convex, about ten ; suture deeply 
channelled; a slight keel winds round the lower half of each whorl; 
surface of last whorl ornamented by strong curved round ribs, about 
fifty in number, crossed by a few depressed longitudinal threads, 
which are more prominent on the base of the shell. 
Dimension. Total length 0:45 inch. 
Locality. Zone of Belemnites acutus, Cloyerly, Salop (Siw BR. Mur- 
chison). (Coll. Geol. Soc.) 
SERPULA SUBPENTAGONA, Tate. 
Serpula pentagona, Terquem and Piette, Lower Lias, East of 
France, p. 118, t. 14, f. 138 & 14, 1865 (non Goldfuss, 1837). 
_ To avoid the dual employment of the specific name pentagona, I 
here propose that the species described by Terquem and Piette 
should be termed S. subpentagona. The two species are very 
different : in S. pentagona the median carina is bounded on each side 
by an elevated costa; in S. subpentagona the shell is regularly 
pentagonal, 
