lAI'I.W \TION OF PLATE 44'. (57 



Fig. 1. Imaginary restoration of Bclemnosepia, showing 

 the probable place of its Ink-bag, and of the internal 

 shell or Belemnite. The three component parts of 

 this Belemnite arc represented as if longitudinally 

 bisected: the place assigned to this Ink-hag is nearly 

 the same as in the recent Loligo. (Original.) 



Fig. 2. Sepia officinalis, showing the position of the inter- 

 nal shell or sheath (Sepiostaire) within the dorsal 

 portion of its sac. Its apex (a,) and calcareous dor- 

 sal plates (e,) correspond with the apex calcareous 

 conical sheath of a Belemnite. 



Fig. 3. Sepia officinalis, laid open along the ventral por- 

 tion of its Sac, to show the position of its Ink-hag. 

 (Original.) 



Figs. 3. a. •'{. />. 'i. c. RhyncholiteS, found in contact with 

 Belemnitcs in the Lias at Lyme Regis. Nat. size. 

 (Original.) 



Fig. 3. (I. Beat of a small Tcstudo from Chalk, in the 

 collection of Mr. Mantcll, showing a hbro-canccl- 

 latcd bony structure, very different from the com- 

 pact shelly condition of the Rhyncholite, for which 

 it may from its size and shape he mistaken. (Ori- 

 ginal.) 



Fig. 4. Ventral surface of a Sepiostaire ; the elongated 

 shallow cone, or cup, (e. e. e'. e'.) is composed of 

 very thin calcareous plates, alternating with horny 

 membranes, which arc expanded outwards to form 

 the thin margin of the cone. This irregular cone 

 or shell represents the hollow cone at the larger 

 extremity of the Belemnite, (Fig. 7. /;. //. e. c. e".) 

 which includes its Alveolus (h. />'.) and Ink-bag (c.) 

 Within this shallow sub-conical shell of the Sepio- 

 staire is contained its alveolus, or calcareous cham- 

 bered portion, (Fig. 4. /'.) which represents the 



