127 
differences as will lead to the format’ on of three species : B.fusi- 
formis, B. cylindriformis, and B. coniformis. The first of these, B. 
fusiformis, Plate VIII. Fig. 13, is by no means a common fossil, ex- 
cept in a very mutilated state. Its general figure is fusiform. A re- 
ceptacle for the alveolus exists in the upper part, in the form of a 
reversed cone, from the point of which the body of the fossil again 
swells, and continues of a compressed roundish shape, wi\h a longitu- 
dinal sulcus, for an inch or two, when it terminates with a tapering 
point. The figure which is here given, is from a specimen, which is 
perfect only as far as the shading is carried, the upper part in outline 
being added from a fossil in the possession of Mr. George Humphries, 
of Leicester-square. I believe this species is chiefly found near to 
Stonsfield, and in the adjoining parts of Oxfordshire. 
JB. cylindriformis, Plate VIII. Fig. 10 and 14, is, I suspect, very 
rarely found in a state so perfect as the other species are. Fig. 14 is a 
fragment of one of these species, so split, as to give a very fair view of 
the alveolus, which is filled with white spathose matter : the belemnite 
itself is formed of the darkest spar that I have seen in any specimen of 
this fossil. Fig. 10 is part of one of the cylindrical species ; but round- 
ish at both ends ; I suspect, from being rolled by the water. This fossil 
is here shown chiefly for the purpose of your noticing a very small linear 
channel, which is continued from the point of the alveolus, longitu- 
dinally, through the rest of the spathose substance. This is the pipe, 
or canal, of which M. Walch speaks, in his account of this fossil. 
JB. coniformis, Plate VIII. Fig. 15, shows the most common form 
of this fossil : the specimen is so broken, as to show also the form and 
situation of the concamerated shell, in its alveolus. The chief varie- 
ties observable in this species are those depending on their colour, and 
their being more or less suddenly pointed, as Figures 11 and 12. 
They are found of various sizes ; from less than that of a goose-quill 
to a foot in length, and two inches in diameter. Baier says, “ Maximi 
belemnitee raro deprehenditur integri: habeo autem ingentia frag- 
