BELEMNITES OF THE LIAS. 



83 



Phragmocone. Straight-sided, angle 25°. Dorsal area less than one fourth, lateral 

 area one eighth of the circumference. Septa approximate. 



This description is mostly from Voltz, who had one complete guard to examine from 

 the Upper Lias of Wurtemberg. That this species occurs in the Upper Lias, on the York- 

 shire coast, I have no doubt, but no good specimens have come to ray hands. I there- 

 fore copy the figures of M. Voltz. It is decidedly analogous to B. compressus of that 

 author, but longer. In the Museum at Whitby is a specimen, No. 454, which agrees in 

 general with the description and figure of Voltz, but it has a very long apicial groove on 

 the ventral aspect. It is named B. incsquistriatus by Mr. Simpson, and bears to B. lon- 

 gisulcatus the same relation that B. ventralis bears to B. compressus, b and c, of Voltz. 

 In the same Museum is a specimen called " B. compressus. Young and Bird," with many 

 longitudinal striae on the flattened apicial region. I made hasty sketches of these, and 

 think one of them of sufficient interest to be here reproduced and described. 



Belemnites iNiEauiSTRiATCs, Simpsou. PI. XIX, fig. 48. 



Reference. Belemnites incequistriatus, Simpson, 'Lias Fossils,' No. 3, p. 24, 1855. 



B. acuarius tricanaliculatus, Quenstedt, 'Cephal.,' p. 414, pi. xxv, figs. 13, 

 14, 15, 1849. 



Guard. Conoidal, uniformly tapering, much compressed, much elongated, obtuse at 

 the end, with two dorso-lateral furrows, one ventral furrow, and several strige. The 

 ventral furrow extends over more than half the apicial space, the dorso-lateral furrow 

 over one fourth, and the striae equal or exceed these in length. The furrows are narrow 

 and very distinct, making the section tripartite near the apex. The axis is above six 

 times as long as the diameter at the alveolar apex. Greatest length observed, 6 inches. 



Phragmocone. Unknown. 



Locality. Upper Lias of Whitby {Simpson). 



Observations. Closely allied to this, if not identical, is B. erosus of Simpson (' Lias 

 Fossils,' No. 5), of which a specimen is to be seen in the Whitby Museum (No. 56) ; 

 and perhaps the same may be said both of B. compressus of that author (' Lias Fossils,' 

 No. 2) and B. concavus (' Lias Fossils,' No. 4), but this I leave for further inquiry. 



Belemnites sulci-stylus, n. s. PI. XIX, fig. 49. 



Reference. Belemnites acuarius macer, Quenstedt, 'Cephal.,' p. 414, pi. xxv, fig. 21, 



1849. 



Guard. Very compressed, suddenly contracted behind the alveolar region, thence 



