29 



25. Sepiola, Leach, 1817 Body short; mantle, with broad neck 



band, and two ventral ridges; fins 

 lateral, small, circular, wing-like ; arms 

 slender, with two or more rows of 

 suckers ; tentacles wholly retractile, 

 with eight rows of suckers; pen half 

 the length of body, narrow. 



26. Sepioloidea, D'Orbigny, 1839 Body short; mantle ciliated at its upper 



edge ; fins lateral, long, circular, wing- 

 like ; arms almost all united by a mem- 

 brane ; pen contracted in the middle. 



27. Fidenas, Gray, 1849 Body oblong ; mantle with broad neck 



band and two ventral ridges ; fins lateral, 

 wing-like, small ; arms partly united by 

 a membrane, with suckers in two rows 

 on stalks ; pen narrow with a central 

 and two side ridges. 



28. Cranchia, Leach, 1817 Body circular; mantle attached to body 



by a neck band, and two ventral septa ; 

 head small ; fins very small, terminal, 

 round; arms short, with two rows of 

 suckers ; tentacles with four rows of 

 suckers ; funnel valved ; pen contracted 

 in middle, and pointed at each end. 



2. The Calcareous Shelled Cuttles, with ten arms, SEPIAD2E {Owen, 1838). 



IX.— Sepias. Animal having a calcareous internal shell. One genus, 



Sepia. 



29. Sepia, Linne, 1801 



Body oblong ; mantle attached to body by 

 a neck band; fins lateral, long; arms, 

 with the exception of the fourth pair 

 united at their base by a membrane ; 

 the fourth pair with a terminal expan- 

 sion ; four rows of suckers with horny 

 margins ; tentacles long, completely re- 

 tractile, suckers unequal, and in many 

 rows ; pen (sepiostaire, bone) long, oval, 

 with a pointed termination. 



3. The Chambered Shelled Cuttles, with ten arms, SPIRULIDJE 



{Owen, 1838). 



X. — Spirulid^e. Animal having a nacreous involute shell, the turns 

 separate, many chambered, with a ventral siphuncle, the shell 

 partly external. One genus, Spirula. 



30. Spirula, Lamarck, 1801 

 = Lituus, Gray, 1849. 



Body oblong ; mantle supported by a 

 dorsal and two ventral ridges fitting in 

 corresponding grooves in the body. 

 Fins terminal, small arms with six rows 

 of suckers. Tentacles elongated. Shell 

 spiral, in the same plane, many cham- 

 bered, the last occupied by a part of the 

 body of the animal. 



