A. E. Verrill — North American Ceplxaloiiods. 427 



OIGOPSID^. 



The division called Oigopsidce includes two very diverse groups, 

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

 sti'ucture of the eyes, siphon, and mantle connections. These may 

 be called Teuthidea and Taonidea. 



The former will include all the Oigopsidse described in this paper 

 except the Desmoteuthidcu. The Taonidea will include our Desnio- 

 teuthidee, and also several allied foi'ms, which have usually been 

 carelessly referred to Lollfjopsis. 



TEUTHIDEA Verrill. 



Eyes with free lids, not stalked. Siphon Avith a subteruiinal valve. 

 Mantle attached to the siphon by free connective cartilages. Stomach 

 large, 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^ Owen (restricted.) 



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



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



1848. 

 Onychoieuthidm (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, Avhich 

 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 arms with hooks, with suckers, or with both. Eyes with free 

 lids and a sinus. Mantle united to neck by three sim))le, 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. 



