Mr. J. S. Miller on Belemnites. 61 



Locality. Dundry. 

 Stratum. Inferior oolite. 



Probably only young specimens of the former. 



Sp. 9. Belemnites electrinus (nobis). PI. VIII. fig. 18, 19,20,21. 



Sp. Ch. Guard amber-colour, nearly transparent, cylindrical, lower end conical, 

 with a mamillated point. In perfect specimens, where the guard adheres to the 

 chambered cone, a longitudinal groove in the centre. On the surface gene- 

 rally traces of the impression occasioned by two longitudinal branching blood- 

 vessels. 



Syn. and Ref. Park. Org. Rem. vol.iii. PI. VIII. fig. 12 ; and a bouldered fragment, 

 fig. 10. 

 Faujas St. Fond, Hist. Nat. de la Mont, de St. Pierre, Pl.XXXII. fig.3. 

 Mantell's Geol. of Sussex, Tab. XVI. f. 1. 



Locality. Salisbury, Isle of Moen, and Riigen, Berwick near Hindon, Brighton, 

 Lewes. Bouldered fragments in the sands of the north of Prussia. 



Strata. In the Chalk formations. The bouldered fragments in the sands of Prussia ar^ 

 probably derived from displaced beds of chalk formerly in connexion with the 

 Isle of Moen and Riigen. 



The mamillated point of this species being formed of more nacreous matter 

 than the rest of the guard, becoming as the guard increases in length its axis, 

 produces on decomposition the central canal described before. 



Sp. 10. Belemnites fusiformis (nobis). PI. VIII. fig. 22. PI. IX. fig. 5, 7. 



Sp. Ch. Guard contracted in diameter below the point of the chambered cone, swell- 

 ing out again and terminating in an acute point. A deep sulcus extends for 

 nearly the whole length of the enlarged portion of the guard. 



Syn. and Ref. Luid, Tab. XXV. fig. 1705. 



Park. Org. Rem. vol. iii. PI. VIII. fig. 13. 

 Hibolithus hastatus. De Montf. vol. i. p. 587. 

 Porodragus restitutus. De Montf. vol. i. p. 591. 



Locality. Stonesfield, the environs of Gap. 



Stratum. Stonefield slate. 



The laminae forming the shell of this species are nearly opaque, and of a 

 dark gray brown colour. The porous appearance of the guard which De 

 Montford has described as a character of the genus Porodragus, appears to 

 be the result of decomposition. 



