CEPHALOPODA. 177 
fectly chambered apex (mucro). Animal with elongated ten. 
tacles, expanded at their ends. 
SEpia (Pliny), Linnzeus. 
Type, S. officinalis, L. Pl. 1., Fig. 5. 
Synonyms, Belosepia, Voltz. (B. sepioidea, Pl. II., Fig. 3, 
mucro only.) Palzeoteuthis, Roem. 
Body oblong, with lateral fins as long as itself. Arms with 
four rows of suckers. Mantle supported by tubercles fitting into 
sockets on the neck and funnel. Length 3 to 28 inches. 
Shell as wide and long as the body; very thick in front, 
concaye internally behind; terminating in a prominent mucro. 
The thickened part is composed of numerous plates, separated 
by vertical fibres, which render it very ight and porous. §. 
Orbignyana, Pl. II., Fig. 2. 
The cuttle-bone was formerly employed as an antacid by 
apothecaries; it is now only used as ‘‘ pounce,” or in casting 
counterfeits. The bone of a Chinese species attains the length 
of 1$ foot. (Adams.) 
The cuttle-fishes live near shore, and the mucro of their shell 
seems intended to protect them in the frequent collisions they 
re exposed to in swimming backwards. (D’Orbigny.) 
Distribution, 30 species. World-wide; 2 British. 
Fossil, 10 species. Oxford clay, Solenhofen. Several species 
have been founded on mucrones from the Eocene of London and 
Paris. Pl. IL, Fig. 3. §. ungula occurs fossil in Texas. 
SPIRULIROSTRA, D’Orb. 
Type, S. Bellardii (D’Orb.). Pl. II., Fig. 4. Miocene, 
Turin. 
Shell, mucro only known; chambered internally; chambers 
connected by a ventral siphwncle ; external spathose layer pro- 
duced beyond the phragmocone into a long pointed beak. 
BELOPTERA (Blainyille), Deshayes. 
Litymology, belos, a dart, and pteron, a wing. 
Type, B. belemnitoides, Blainville. Pl. IL, Fig. 7. 
Shell, mucro (only known) chambered and siphuncled ; winged 
externally. 
Fossil, 4 species. Eocene. Paris; Bracklesham. 
BELEMNOSIS, Edwards. 
Type, B. anomalus, Sby. species. Eocene, Highgate (unique). 
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