207 
speaks of the alveolus: circles in the direction of their 
edges are figured by M. Brongniart ; and we have speci- 
mens that prove the accuracy of his figure, but they show 
no projections. The ramose impressions upon the sur- 
face and entering the fissure indicate an internal shell ; 
this circumstance and the absence of septa would be suf- 
ficient grounds for placing this and one or two other spe- 
cies together as a distinct genus from the Belemnites 
with chambered alveoli, provided we could ascertain the 
latter character; but in all probability the want of septa 
is accidental. _ 
This mucronated Belemnite is a constant inmate of 
the upper beds of chalk in all countries. ‘The specimens 
represented figs. 1.2.& 4. are from Norwich. Fig. 1. 
shows a peculiar asperity about the pointed extremity. 
Fig. 2.a small specimen, with part of a Gryphza globosa 
attached to it. Fig.4. a section, such as is easily ob- 
tained by fracture. Fig. 6. the variety called Actinoca- 
max verus. Fig. 7. a young individual from Margate. 
We have a specimen considerably larger than fig. 1. 
Some specimens are coated with silex, and even pene- 
trated in parts by it. | 
We have specimens from the hardened chalk of the 
North of Ireland. 
BELEMNITES granulatus. 
TAB. DC.—figs. 3. & 5. 
Spec. Cuar. Subcylindrical ; apex obtuse, mucro- 
nated ; surface granulated. 
Syn. Belemnites granulatus. (De France) Blain- 
ville, 63. pl. 1. f. 10. 
Tue form of this shell (we have not seen the expanded 
base) is precisely the same as that of B. mucronatus ; it 
