205 
BELEMNITES mucronatus. 
TAB. DC.—figs. 1. 2. 4. 6. & 7. 
Spec. Cuar. Subcylindrical, base expanded; the 
other end obtuse, with a central mucro; 
aperture nearly orbicular. 
Syn. Belemnites mucronatus(Schlottheim.), Brongn. 
& Cuvier Geol. des Env. de Paris, 382. Pl. 3. 
f.1. De Blainville, Mem. sur les Belemnites, 
64. Pl. 1. f. 12. 
B. electrinus, Miller, Trans.Geol.Soc. 2nd series, 
vol. 2. part 1. 61. Pl. 8. f. 18. 19. 20. 21. 
Pl. 9. f. 1. & 3. 
B. coniformis ? Parkinson, Org. Remains, vol. 3. 
patel. & lod. PLS. f, 12) PLO. fF, 1. 
Belemnite, Faujas, Maestricht. 178. Pl. 32. f. 3. 
Actinocamax verus. Miller, Trans. Geol. Soc. 
2nd series, vol. 2. part 1.64. Pl.9. f. 1'7. 18. 
B. Scaniz, B. Gsterfieldi, & B. quadratus ? 
Blainville, 61. & 62. Pl. 1. f. 7. 8. & 9. 
oS LE 
Tue otherwise cylindrical form of this Belemnite is de- 
stroyed by a slight contraction towards the expanded 
base, and by a rather sudden decrease to the mucronated 
apex; along the front of the expanded portion is a fur- 
row communicating with the conical internal cavity ; 
on each side of the back is a flat space extending nearly 
the whole length of the shell; numerous ramified chan- 
nels diverge from these spaces round the sides and meet 
upon the front, or enter the furrow above mentioned. 
We have never seen any septa in the conical cavity, 
which is very deep, but only circles indicating their 
edges, and a furrow along the back, besides the fissure in 
the front. Length about four inches, greatest diameter 
