A. E. Verrill — North American Cephalopods. 42V 



OIGOPSID.E. 



The division called Oigopsidm includes two very diverse groups, 

 diftering very widely in their visceral anatomy, as well as in the 

 structure of the eyes, siphon, and mantle connections. These may 

 be called Teutliidea and Tao)iklea. 



The former will include all the Oigopsidie described in this paper 

 except the Desmoteuthidce. The Taonidea will include our Desmo- 

 teuthidce, and also several allied forms, which have usually been 

 carelessly referred to LoUgopsls. 



TEUTHIDEA Verrill. 



Eyes with free lids, not stalked. Siphon with a subterminal valve. 

 Mantle attached to the siphon by free connective cartilages. Stomach 

 lai-ge, pouch-like; intestine short; liver very large; ink-sacs large. 

 Pen horny, well developed, as long as the mantle. One of the 

 ventral arms is usually hectocotylized in the male. Arms with 

 suckers, or with claws, or with both. 



Family TEUTHID^E Owen (restricted.) 



Teuthidce (pars) Owen, Trans. Zool. Soc. London, vol. ii, 1838. 



Teuthidce (pais) D'Orbigny, Ceplial. Acetab., p. xxxvii (Introduction), p. 328, 1835- 



1848. 

 Onychoteuthidce (pars) Gray, Catal. Brit. Mus., Moll, vol. i, p. 45, 1849. 



H. & A. Adams, Genera, vol. i, p. 30. 



Tentacular arms furnished with sharp, horny claws or hooks, which 

 correspond with peculiarly and highly modified sucker-rings ; true 

 denticulated suckers usually accompany the hooks; tip of arm with 

 a cluster of small suckers; proximal part of club usually with a 

 mixed group of connective tubercles and smooth-rimmed suckers, by 

 which the arms can be fastened together and used in concert. Ses- 

 sile arras with hooks, with suckers, or with both. Eyes with free 

 lids and a sinus. Mantle united to neck by three simple, movable, 

 connective cartilages. Siphon with a valve and with dorsal bridles. 

 Nuchal or olfactory crests well developed. Pen thin, usually lanceo- 

 late, generally with a posterior hooded portion, or hollow cone, and 

 sometimes terminated by a solid cartilaginous cone. Hectocotylized 

 arm not observed. 



Trans. Conn. Acad., Vol. V. 51 December, 1881. 



