38 BRITISH BELEMNITES. 



Phragmocone. Unknown, excepting that its section was nearly circular, and that 

 its angle was about .28°. 



Locality. Lyme Regis, from a calcareous band, probably in the upper part of the 

 Lower Lias. Dr. Buckland's collection one specimen. Professor Phillips's collection, one 

 specimen. 



Belemnites calcar, n. s. PI. II, fig. 5. 



Guard. Conoidal, straight, tapering to a blunt apex ; sides planate, somewhat 

 inclined to one another ; ventral and dorsal surfaces rounded ; the ventral aspect broadest. 

 Transverse section oblong, axis very short. 



Proportions. The diameter, v d, being taken at 100, the axis is of about the same 

 length; the transverse diameter about 90. 



Phragmocone. Only partially known. One specimen of Dr. Buckland's (fig. 5, s") 

 shows several close displaced septa in the forward part. Its axis must have been five or 

 six times as long as that of the guard. In a specimen belonging to Mr, C. Moore, from 

 Weston, the alveolar parts of the guard are crushed over the alveolar chamber, as in the 

 specimen from Lyme (fig. 5, I', I") ; whether they contain any septa can only be known 

 by making sections ; and for this more specimens are required. 



Locality. Lyme Regis, from the Lower Lias beds, with Ammonites BucUandi {Geol. 

 Survey collection. No. 612). Weston, near Bath, in Lower Lias, with J. BucUandi 

 {Moore 8 collection). The specimen PI. II, fig. 5,/"', is from the Belemnite-beds at the 

 base of the Middle Lias of Lyme Regis. It may possibly be of a difierent species {Geol. 

 Survey collection, No. 613). 



Observations. In general figure this Belemnite agrees with B. brevirostris of 

 D'Orbigny {' Pal. Fr. Cephalop.,' pi. x, figs. 1 — 6 ; on the plate it is called curtus), but 

 that species has distinct lateral grooves, which do not appear on the English specimens. 

 It belongs to the Upper Lias of France and Germany ; ours as yet appears to be confined 

 to older beds. There is also a resemblance to the incomplete specimen of Belemnites 

 acuarius macer figured by Quenstedt (' Cephalop.,' pi. xxv, figs. 27, 28, 29, 30) ; but 

 those figures are deficient of the extended and striated guard figured on the same plate 

 (pi. xxv, figs. 21, 22). The striations are the effect of the decomposition which 

 has removed the apex. On the same plate fig. 25 represents an individual " der noch 

 die Verlungerung nicht hat," and fig. 26 another ; from which it might be supposed that 

 such individuals as ours may be incomplete, and might, indeed, be subject to the same 

 elongation as those of Quenstedt. His specimens are from the uppermost bands of 

 the Lias of Heiningen, ours from the Lower Lias. 



