60 Mr. J. S. Miller on Belemnites. 



Sp. 4. Belemnites elongatus (nobis). PL VII. fig. 6, 7, 8. 



Sp. Ch. Guard slender, tapering to a conical point. 



Syn. and Ref. Piatt in Phil. Trans, vol. liv. for 1764, and in the Abridgment of ditto, 



vol. xii. PI. III. fig. 8. 

 Locality, Lyme in Dorsetshire. 

 Stratum. Lyas and lyas-clay. 



This is a slender species of a dark brown colour, generally showing very 

 distinctly the organization of its guard in the superposition of its laminae. 



Sp. 5. Belemnites longissimus (nobis). PI. VIII. fig. 1, 3. 

 Sp. Ch. Guard very thin, long, smooth and terminating in a conic point. 

 luocality. Lyme in Dorsetshire. 

 Stratum. Lyas and lyas-clay. 



This species is very remarkable on account of its slender form^ generally 

 of a yellow brown colour and more than usually opaque. 



Sp. 6. Belemnites acutus. PI. VIII. fig. 9. 

 Sp. Ch. Guard conical, terminating in an acute point. 

 Syn. and Ref. Luid. Tab. XXV. fig. 1683 ? 



Sp. 7. Belemnites tripartitus. PI. VIII. fig. 10, 11, 12, 13. 



Sp. Ch. The guard is formed of three longitudinal portions, showing near the apex 

 three distinct longitudinal ridges. 



Syn. and Ref. Von Schlotheim Petrefactenkunde, vol. i. 



Sp. 8. Belemnites eUipticus (nobis). PI. Vlll. fig. 14, 15, 16, 17. 



Sp. Ch. Guard opaque, grayish brown, much elongated, elliptical, terminating in a 

 mucronated point. 



Syn. and Ref. Knorr, Monum. vol. iii. sup. IV. fig. 3 & 4. 

 Klein, Tub. Mar. Tab. IX. fig. 3 & 4. 



Locality. Iron mines at Fuerslenberg (Knorr), Dundry. 



Stratum. Inferior oolite. 



It is a very large and long species, almost opaque and of a pale yellow 

 brown colour. The guard in an early state of growth is generally round, 

 as may be seen in transverse sections, but becomes subsequently, by an appo- 

 sition of laminae of irregular thickness, of an elliptical form. 



Var. a. The guard less elliptical, terminating in a conical point. 



