102 BRITISH BELEMNITES. 
except toward the apex, where a portion in length about equal to half the axis is free 
from any groove or depression. 
Transverse section nearly circular ; axis subcentral. 
Dimensions of an ordinary specimen 2: inches, of which 1: belong to the axis. Diameter 
at apex of alveolus 0:46. 
Proportion of axis to diameter at apex of alveolus 325 to 100. 
PHRAGMOCONE. Unknown to me. 
Locality. Yeovil, in Inferior Oolite (Oxford Museum). 
Observations. D’Orbigny quotes Bel. sulcatus as the prior equivalent of this species, 
and gives figures (‘‘Terr. Jur.,’ pl. xn, figs. 1—8) of the young and old, with several cross 
sections, and one longitudinal section. It is very doubtful whether these all belong to 
one species. ‘The fusiform young is marked by an almost continuous furrow, like the 
Stonesfield fossils; the longitudinal section belongs to a remarkably short type; the 
mature individual has a peculiarity in the expanding posterior ending of the canal. 
In the Museum of the Garden of Plants is a large series of ‘ B. apiciconus,’ jun. 
from Croiselles, in Normandy. 
Bel. canaliculatus of Schlotheim is too variously interpreted to be safely quoted, 
except in the definite shape given to it by Quenstedt, in the work quoted. In his 
‘Cephalopoda,’ B. canaliculatus is made to include B. sulcatus of Miller, B. Alidorfensis 
and its Russian analogue, and the Stonesfield fossil, of which a young example is given, 
‘Cephalopoda,’ pl. xxix, fig. 7. 
BeLeMNiTES BuainviLut, Voltz. Pl. XXV, figs. 59, 60. 
Reference. Belemnites acutus, Blainville, ‘Mém. sur les Bélem.,’ p. 69, pl. u, fig. 3 
(medium size), 1827. 
B. Blainvillii, Volts, ‘Obs. Bélemn.,’ p. 37, pl. 1, fig. 9 (full-sized), 1830. 
z D’Orb., ‘Terr. Jur.,’ p. 107, pl. xu, figs. 9—16 (young), 
1842. 
Guarp. Elongate, uniformly tapering to a smooth, rather blunt apex. Ventral face 
marked by a distinct narrow groove extending from very near the apex to the beginning 
or over a part of the alveolar cavity, and then ceasing gradually. 
Transverse sections nearly circular, or a little oblong, with a nearly central axis. 
Dimensions. Largest specimen which I have measured 4! inches long, of which the 
axis is 3} inches, the diameter at the alveolar apex being 0°43 from back to front and 
0°41 across. In smaller specimens length 3 inches, diameter 0°36. Young specimens, 
such as figured by Voltz, I have not seen. 
