l82 



OCTOrODA 



tions of the same. In front of the cephalic cartilage occurs a 

 piece like an inverted T, which supports the base of the anterior 

 arms. The Decapoda have also a ' nuchal ' cartilage, connectino- 

 the liead with the anterior dorsal portion of the mantle, while 

 cartilaginous knobs on the ventral mantle button into correspond- 

 ing sockets on the funnel. 



Sub-order I. — Octopoda. — Body round or bag-like, generally 



^N 





\ ""'^*«„„. 



/^ 



Fig. 241. — Cirrhoteuthis magna Hoyle, S. Atlantic. Two of the left arms and their 

 web have been removed : /, funuel ; Ji, Ji, lius ; vi, mouth. (After Hoyle, x yV.) 



without fins, arms eight, suckers iieshy, usually sessile, oviducts 

 paired, no nidamental glands, sliell absent. 



Fam. 1. Cirrliotcvthiclac. — Body with two prominent fins ; 

 arms in great part united by a web ; one row of small suckers, 

 with cirrhi on each side. — Atlantic and Pacific Oceans, deep 

 water (Fig. 241). 



Fam. 2. A7n2)hitretidae. — Body gelatinous, mantle fused with 



