THE €CEPHALOPODA 339 
Keferstein. Arms enlarged, bearing two rows of suckers and filaments. 
Fins triangular, extending along the whole length of the body. Genus— 
Thysanoteuthis, Troschel (Fig. 298, B) ; Mediterranean. Famity 8. ONycHO- 
TEUTHIDAE, Gray. Fins terminal. Tentacular arms long; the suckers 
provided with hooks, Genera—Onychoteuthis, Lichtenstein; the hook- 
bearing suckers exist only on the well-developed tentacular arms. Hnoplo- 
teuthis, VOrbigny ; tentacular arms well developed ; hook-bearing suckers 
Fic. 298. 
Decapod Cephalopoda. A, Cheiroteuthis Veranyi, dorsal aspect; B, Thysanoteuthis rhombus, 
dorsal aspect ; C, Leachia cyclura, ventral aspect. (From Lankester, after Verany, Troschel, 
Feérussac and d’Orbigny.) 
on all the arms. Veranya, Krohn; body very short; fins obtuse ; 
tentacular arms atrophied in the adult; Mediterranean. Chaunoteuthis, 
Appellof; body elongated; fins prominent and pointed; tentacular 
arms atrophied. Pterygioteuthis, Fischer. Ancistroteuthis, Gray. Abralia, 
Gray. Teleoteuthis, Verrill. Lepidoteuthis, Joubin. Famity 9, Gona- 
TIDAE, Hoyle. Body elongated; fins terminal. Radula with only two 
lateral teeth. Genus—Gonatus, Gray. FaAminy 10. CHEIROTEUTHIDAE, 
Gray. Tentacular arms long and not retractile. Body elongated ; fins 
large and rounded. Resisting apparatus well developed. Genera— 
