44 BRITISH BELEMNITES. 



Phragmocone arched, ending in a spherule ; angle 27° in the anterior part ; nearly 

 30° towards the apex. Transverse section nearly circular. Septa frequent. 



If it be found eventually desirable to separate these varieties, it will be best, I 

 conceive, to make the division so as to insulate the variety a, which appears to me rather 

 indeterminate, and to resemble the young of other species too much to be quite satis- 

 factorily identified among the Lyme specimens. 



Localities. Alderton, Gloucestershire, in marlstone {Phillips). Bredon Hill, marl- 

 stone {Strickland). Eston Nab, and East of Staithes, Yorkshire, in ironstone above the 

 marlstone {Phillips). Ilminster, in marlstone of Middle Lias {Moore) ; this is shorter 

 and stouter than usual. 



Synonyms. D'Orbigny refers the fossils figured by him pi. ix, figs. 1 — 7, to this species, 

 expressly referring to Voltz, pi. ii, figs. 2, 3, 4. He calls it in the text B. abbreviatus 

 of Miller and Sowerby ; on the plate and in the text it is entitled B. brevis, Blainville. 

 Authors who quote D'Orbigny in the ' Pal. Franp.' should observe the difference of the 

 names on the plates and in the text. The specimen figured by D'Orbigny does not well 

 agree with Voltz's species ; it is larger, has no trace of lateral furrows, and according to the 

 drawing a straight-sided phragmocone, with a decidedly oval section. That it was one of 

 the varieties included by Miller in his B. abbreviatus may be readily supposed. It is 

 not the exact equivalent of B. brevifor^nis amalthei of Quenstedt (pi. xxiv, figs. 21 — 23), 

 Avhich has furrows near the apex, but is rather comparable to B. breviformis, Quenstedt 

 ' Cephal.,' pi. xxvii, figs. 22 — 27 ; {B. Gingensis of Oppel), an Oolitic rather than Liassic 

 form, of the South of England, which will be noticed immediately. 



Belemnites Gingensis, Oppel. PI. V, fig. 11. 



Reference. Belemnites breviformis, Quenstedt, ' Cephalop./ p. 428, t. xxvii, figs. 

 23—26, 1849. 

 B. Gingensis, Oppel, ' Jura,' p. 362, 1856. 



Guard. Short, conoidal, contracted, and curving rapidly to an acute, produced, sub- 

 mucronate, rather recurved summit ; no distinct grooves about the summit ; no distinct 

 flattening of the sides. 



Sections show the general outline nearly circular, the axis very excentric and arched, 

 and very near the ventral face. 



Greatest length observed (the edge being very thin) under 2^ inches ; greatest dia- 

 meter, under |. 



Proportions. The diameter at the apex of the phragmocone being 100, the ventral 

 radius is about 30, the dorsal 70; the axis varies between 160 and 210 ; the diameters 

 are nearly equal. 



Phragmocone. Incurvate, with an angle of 28°, and a nearly circular section. Septa 



