A. E. Verrill — North American Cephalopods. 
42 1 
OIG-OPSID.E. 
The division called Oigopsidce includes two very diverse groups, 
differing very widely in their visceral anatomy, as well as in the 
structure of the eyes, siphon, and mantle connections. These may 
be called Teuthidea and Taonidea. 
The former will include all the Oigopsidie described in this paper 
except the JJesmoteuthidce. The Taonidea will include our Desmo- 
teuthidce , and also several allied forms, which have usually been 
carelessly referred to Loligopsis. 
TEUTHIDEA V errill. 
Eyes with free lids, not stalked. Siphon with a subterminal 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^E Owen (restricted.) 
Teutliidce (pars) Owen, Trans. Zool. Soc. London, vol. ii, 1838. 
Ttuthidxx (pars) D'Orbigny, Ceplial. Acetab., p. xxxvii (Introduction), p. 328, 1835- 
1848. 
Onychoteutliidm (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 w r ith 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 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. 
Teans. Conn. Acad., Vol. V. 
51 
December, 1881. 
