CRANCHIAD^. 37 



Suborder I. Chondrophora, 



Shell internal, solid, horny or cartilaginous, either lanceolate, pen- 

 nate, with a central longitudinal dorsal ridge above, and a groove 

 beneath, sometimes thick on each side near the edges ; or flat, 

 narrow, with a narrow central longitudinal solid rib, and a similar 

 rib on each edge. The apex solid, sometimes thickened, produced, 

 and cartilaginous. 



Teuthomorpha (pars) Bronn^ Gesch. der Nat 538. 1847. 



Sect. I. — Ventral side of mantle supported by two internal fleshy 

 bands. 1. Cranciiiad^. 2. Loligopsid^. 



Sect. II. — Ventral side of mantle free, with two internal carti- 

 laginous ridges. 3. Chieoteuthid^. 4. Onychoteijthid-e. 

 5. LoLiGiD-a:. 



%. Mantle supported hy two internal fleshy Bands on the ventral Side. 

 Body soft., semitransparent., elongate. Fins posterior^ dorsal. 



Fam. I. CRANCHIAD^.. 



Body large, membraneous, ventricose, rounded behind, narrowed 

 and truncated in front. Fins terminal, affixed to a special 

 prolongation of the body, oval, separated by a nick behind ; 

 united to the head by a narrow cervical band, and below by a 

 fleshy band on each side of the base of the siphuncle. 



Head very small, very narrow in front and behind the eyes. 

 Eyes large, prominent, covered with a continuous skin with a 

 small transparent spot. Buccal membranes large, acutely eight- 

 lobed ; lobes opposite to the base of the arms. 



Arms. Sessile arms conical, subulate, short, unequal, without fins, 

 and with two rows of cups ; the third pair longest ; three 

 upper pairs shortly webbed together. Tentacular arms large ; 

 club finned behind, and with four series of cups. 



Siphuncle very long, obliquely truncated at its extremity, with an 

 internal valve, but no superior central band. 



Shell horny, as long as the body, narrow, bilanceolate, and pointed 

 at each end. 



Cranchina Gray, Proc. Zool Soc. 1847, 205. n. 801. 

 Cranchia Ferussac, Owen, D'Orh. Moll. Viv. ei Fos. i. 238. 

 Sepidae (pars) D'Orb. Moll. Viv. et Fos. i. 238. 1845. 

 \Calmars B. Les Cranchies Blainville. 

 Teuthidae (pars) Owen, Trans. Z. S. ii. 4. 1838. 



