23- 



Manchester Memoirs, Vol. xlviii. (^igo\), No.%\.. 7 



Body rather elongated ; medio-dorsal margin of mantle 

 free, but with no cartilaginous connecting apparatus ; 

 anterior part of right oviduct present along with com- 

 plete left oviduct ; both ventral arms hectocotylised. 

 (Idiosepiid^) Idiosepius. 



Body short, saccular; medio-dorsal margin of mantle 

 either continuous with head or with cartilaginous 

 connection ; right oviduct absent ; one ventral or 

 both dorsal arms hectocotylised (Sepiolid^) 24^ 



fDorsal margin of mantle fused in middle line so that 



the integument is continuous with that of the head 25 



24.^ 



Dorsal margin of mantle free from the head and with a 



cartilaginous articulation (RossiiN^) 32 



Left ventral arm hectocotylised ; mantle fused with the 

 head in the mid-dorsal line \ shell absent. 

 ^5-"^ (Sepiadariin^) 26 



Dorsal arms hectocotylised 27 



'A cartilaginous articulation with the mantle present at 

 the base of the funnel ; mantle margin notched ; 

 body longitudinally striped ; pores on the under 

 surface Sepioloidea. 



Mantle fused with the base of the funnel on either side, 

 no cartilaginous articulation Sepiadarium. 



'Dorsal margin of the mantle fused with the head ; no 

 cartilaginous articulation in the nuchal region. 



(Sepiolin^) 28 



A 



27.^ 



Dorsal margin with a continuous fold, but with a 

 cartilaginous articulation only in the anterior region ; 

 the mantle and body fused further back. (Hetero- 



TEUTHIN^) 31 



