CEPHALOPODA. 33 
A species much resembling the young of B. Cuvieri; but, according to the few 
‘specimens we possess at present, it is distinguishable by the shortness and the greater 
convexity of the inferior surface of the rostrum, and also by the dorsal surface, which 
is rounder than in B. Cuviert, slants downwards, and, even in the largest specimens, 
barely presents the cutting edge which distinguishes the two preceding species. The 
callus is longer in proportion, and is so much compressed, as to present a narrow, almost 
a sharp edge; and it enlarges more rapidly than even in the last species, owing to the 
greater width of the terminal cavity. 
The ventral plate is semicircular, and nearly smooth on the inferior margin, and, 
owing to the width of the cavity, is transversely elliptical on the superior margin ; it 
is also narrower and more deeply sulcated than in B. Cuvieri. 
The B. brevispina is found at Bracklesham Bay, and is very rare. I possess four 
specimens of different sizes, which all present the same characteristic form ; but it is 
not improbable that a larger series would show that the species is but the young form, 
or at all events only a variety, of B. Cuvieri. 
The length of the rostrum is ‘2 inch; the width rather less than *2 inch. 
Genus 2d. BrLopTERA. Deshayes.* 
Animal unknown, but supposed to have been closely allied to the Belemnite, which, 
as described by Professor Owen, appears to have been oblong; the head, surrounded 
by ten arms, (?)} furnished, like those of the recent genus Oxychoteuthis, with a double 
alternate series of slender, elongated, horny hooks; mandibles horny; (?) the body 
purse-shaped, conical, elongated, supporting near the middle two lateral fins, rounded 
and entire along their free margin; inclosing an ink-bag. 
Shell internal, composed of two cones placed apex to apex, united, and expanding 
on each side into wing-shaped appendages, obliquely inclined towards the ventral 
aspect; the anterior cone smooth, longitudinally fibrous, hollowed into a deep conical 
cavity, containing regular transverse concave septa, pierced by a ventral siphon. 
B. Testa internd, duobus conis, apice ad apicem conjunctis, formatd ; utroque latere 
duobus appendicibus aliformis, deorsum inclinatis, sustentd ; superficie dorsali convexd, 
ventrali concavd ; cono anteriort levigato, longitudinaliter fibroso, cavitati conicd, profunda, 
septa transversa continenti, excavato; septis concavis, regularibus, siphone ventrali 
perforatis. 
Guettard, the first author by whom these remains appear to have been noticed, 
* Etym. Bedos, telum; zrepoy, ala. 
+ The eight sessi/e or normal arms only have as yet been found preserved. Professor Owen states that 
the traces of the superadded pair of tentacula are somewhat doubtful. 
