306 
A. E. Verrill — North American Cephalopoda. 
be much studied. The two large, fusiform, cellular organs (/, r ') are 
probably renal in nature ; their interior is filled with large, irregular 
cavities or lacunae, which appear to be connected with the posterior 
venae cava? ( vc "). 
Taonius Steenstrup. 
Loligo (pars) Lesueur, Journ. Philad. Acad., ii, p. 96, 1821. 
Loligopsis (pars) D’Orbigny, Ceph. Acetab., p. 320, (non Lamarck). 
Gray (pars), Catal. Moll. Brit. Mus., i, p. 39. 1849. 
Taonius (pars) Steenstrup, Oversigt Kgl. Danske Vidensk. Selsk. Forh., 1861, pp. 
70, 85. 
This genus seems to bear about the same relation to Desmoteuthis 
that liossia does to Sepiola. Its relations with Loligopsis and 
Leachia have already been discussed (pp. 301 , 302 ). The body is 
short-pointed posteriorly. The caudal fin is long-cordate, but not 
slender pointed. The pen is lance-shaped, the anterior portion being 
long, narrow, of nearly uniform width ; posterior end broad-lanceolate, 
short-pointed posteriorly, and, according to the figures, without a 
cone at the tip. The anterior dorsal edge of the mantle is repre- 
sented as free externally, but there is a dorsal commissure within the 
mantle-cavity, and a lateral one on each side. Arms short, subequal ; 
suckers flat, denticulate ; those of the tentacles with sharp, incurved 
teeth. Eyes large, globular, prominent, lids free and simple. 
Siphon with neither valve, nor dorsal bridle. Xo external ears, 
nuchal crests, nor cephalic aquiferous pores. 
Taonius pavo Steenstrup. 
Loligo pavo Lesueur, Journal Acad. Nat. Science Philad., ii, p. 96, with a Plate, 1821. 
Loligopsis pavo Ferussac and D’Orb., Ceph. Acetab., p. 321, Calmars, PI. 6, figs. 1-4, 
(after Lesueur) : Loligopsis, PI. 4, figs. 1-8 (details, original). 
Binney, in Gould, Invert. Mass., ed. II, p. 309, (but not the figure, PI. 26). 
Verrill, Amer. Journ. Sci., xix, p. 290, 1880. 
Trvon, Amer. Mar. Conch., p. 9, PI. 1, fig. 3 (after Lesueur); Man. Conch., i, p. 
163, PI. 68, fig. 252, PI. 69, fig. 253, 1879 (descr. from Gray, figures from 
Lesueur and D’Orb.). 
Taonius pavo Steenst., Oversigt Kgl. Danske Vidensk. Selsk. Forh., 1861, pp. 70 
and 85. 
This species differs externally from the preceding in having a 
much shorter, obtuse, oblong-cordate, fin, instead of a long, slender, 
pointed one, and by its very distinct coloration. According to Les- 
ueur the general color is carmine-brown, the mantle, head, and arms 
“ covered on every part with very large ocellations, which are con- 
nected together by smaller intermediate ones.” Length of mantle, 
10 inches. 
