67 
Explanation of plate 44 ', 
P'g- 1 . Imaginary restoration of Belemnosepia, shewing 
the probable place of its Ink-bag, and of the internal 
shell or Belemnite. The .i^ree component parts of 
th.s Bedemmte are represented as if longitudinally 
bisected: the place assigned to this Ink-bao- is 
nearly the the „ce„tL„Iig„. (Origins, 
g- - Sepia officinalis, shewing the position of the 
internal shell or sheath (Sepiostaire) within the 
dorsal portion of its sac. Its apex (a,) and cal- 
careous dorsal plates (e,) correspond with the apex 
calcareous conical sheath of a Belemnite. 
'g- 3. Sepia officinalis, laid open along the ventral 
portion of Its Sac, to shew the position of its Ink- 
bag. (Original.) 
P'gs. 3. «. 3.b. 3. c. Rhyncholites, found in contact with 
Belemnites in the Lias at Lyme Regis. Nat. size 
(Original.) 
Pig- 3 d. Beak of a small Testudo from Chalk, in the 
collection of Mr. Mantell, shewing a fibro-eancel- 
lated bony structure, very different from the com- 
pact shelly condition of the Rhyncholite, for which 
It may from its size and shape be mistaken. (Ori 
ginal.) 
ig- 4. Ventral surface of a Sepiostaire ; the elongated 
shallow cone, or cup, (e. e. e'. e’.) is composed of 
very thm calcareous plates, alternating with horny 
membranes, which are expanded outwards to form 
the thm margin of the cone. This irregular cone 
or shell represents the hollow cone at the larger 
extremity of the Belemnite, (Fig. 7. b. b'. e. e'. e" ) 
which includes its Alveolus {b. b'.) and Ink-bag (c.). 
ithin this shallow sub-conical shell of the Sepio- 
staire is contained its alveolus, or calcareous cham- 
ered portion, (Fig. 4. b.) which represents the 
