CEPHALOPODA. S3 



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. Cuvieri, 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. Beloptera. 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, (?)f furnished, like those of the recent genus Onychoteuthis, 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 interna, duobus conis, apice ad apicem conjunctis, formatd ; utroque latere 

 duobus appendicibus aliformis, deorsum inclinatis, sustentd ; superjicie dorsali convexd, 

 ventrali concavd ; cono anteriori Iceviyato, longitudinaliter Jibroso, 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. BeXos, telum ; irrepov, ala. 



f The eight sessile or normal arms only have as yet heen found preserved. Professor Owen states that 

 the traces of the superadded pair of tentacula are somewhat doubtful. 



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