CEPHALOPODA. 169 



Pen broad, pointed behind ; shaft broad, truncated in front ; 

 lateral wings shorter thau the shaft. 



Fossil, 9 species. Upper Lias, Wurtemberg ; Calvados ; 

 Lyme Eegis. Several undescribed species in the Oxford clay, 

 Chippenham. 



Besides ih.Q pens of this calamary, the inJc-hag, the muscular 

 mantle, and the bases of the arms, are preserved in the Oxford 

 clay. Some of the ink-bags found in the Lias are nearly a foot 

 in length, and. are invested with a brilliant nacreous layer ; the 

 ink forms excellent sepia. It is difficult to understand how 

 these were preserved, as the recent calamaries " spill their ink" 

 on the slightest alarm. (Buckland.) This genus may probably 

 turn out to belong to the Belemnitidse. 



Leptotetjthis, Meyer. 



Etymology, Lepfos, thin, and teuthis. 

 Type, L. gigas, Meyer, Oxford clay, Solenhofen. 

 Pen very broad and rounded in front, pointed behind ; with 

 obscure diverging ribs. 



Cea]S"Chia, Leach, 1817. 



Named in honour of Mr. J. Cranch, naturalist to the Congo 

 expedition. 



Synonym, Owenia, Prosch. 



Type, C. scabra, Leach. 



Body large, ventricose ; fins small, terminal ; mantle supported 

 in front by a branchial septum. Length two inches. Head very 

 small. JEyes fixed. Buccal membrane large, 8-lobed. Arms 

 short, suckers in two rows. Tentacular clubs finned behind, 

 cups in four rows. Funnel valved. 



Pen long and narrow. 



Pistrihution, 3 species. "West Africa ; in the open sea. 



This genus makes the nearest approach to the octopods. 



Sepiola. (Eondelet) Leach, 1817. 



Example, S. atlantica (D'Orbigny). PL I., fig. 4. 



Body short, purse-like ; mantle supported by a broad cervical 

 band, and a ridge fitting a groove in the funnel. Fins dorsal, 

 rounded, contracted at the base. Suckers in two rows, or 

 crowded, on the arms, in four rows on the tentacles. Length 

 two to four inches. First left arm hectocotylised. 



Pen half as long as the back. S. Stenodactyla (sepioioidea, 

 D'Orbigny) has no pen. 



