108 BRITISH BELEMNITES. 
BELEMNITES PARALLELUS, n. s. Pl. XXVII, figs. 65, 66. 
Reference.—Belemnites canaliculatus Quenstedt., ‘Cephalop.,’ pl. xix, fig. 4, from 
beds below Ammonites macrocephalus ; and B. fusiformis of the same 
author pl. xxix, fig. 40, from the Great Ooolite of Lahr, in the Rhein- 
thal, may probably be of his species. 1849. 
Guarp. Elongate, depressed, except in the advanced alveolar region ; fusiform when 
young, then becoming hastate or subhastate (old specimens unknown at present). Ventral 
surface marked by a distinct groove, extended forward over the alveolar cavity and back- 
ward toward the very acute apex, but terminating in that direction so as to leave free 
from groove a length equal to one third of the axis of the guard. 
‘lransverse sections circular across the forward part of the alveolar cavity, depressed 
and reniform in all the post-alveolar part, except toward the apex, where they pass from 
elliptical to circular. 
Dimensions. From }inch to 34 inches, of which the axis is about 2 inches and 
Shs: 
Proportions. In the oldest example yet observed, the axis is seven times as long as 
the greatest post-alveolar breadth, ten times as long as the breadth at the alveolar apex, 
and between eleven and twelve times as long as the ventro-dorsal diameter there. 
Axis, therefore, 1150; the ventro-dorsal diameter being taken at 100. 
Puracmocone. In one specimen 24 septa are counted in a quarter of an inch from 
the apex, which is terminated by rather a large spherule. The angle of the phragmocone 
is about 28°. 
In young fusiform specimens, resembling an oat-grain, the alveolar part is rarely 
traceable, the pearly lamine of the guard having perished, or fracture having 
occurred. In older specimens these white laminee are covered over by darker and more 
solid layers. 
Locality. Yn Clay coloured on the Ordnance Map as the ‘ Fuller’s Earth,” between 
Great and Inferior Oolite, at Whistle Bridge, near Yeovil (/dotson, Buckman, Wood) ; 
and Misterton, near Sherborne (Buckman). In the Museum at Strasburg a specimen 
marked from the “Fuller’s Karth at Oerschingen,” above 5 inches long, much resembles 
our specimens from Dorsetshire. In the Oxford Collection are specimens from the Oxford 
Clay at Long Marston, near Oxford, which cannot be distinguished from those of Dorset. 
