306 A. JS. Verrill — North American Cephatopods. 



be much studied. The two large, fusiform, cellular organs (r', r') are 

 probably renal in nature ; their interior is filled with large, irregular 

 cavities or lacunae, which appear to be connected with the posterior 

 vena3 caviB {vc"). 



TaoniuS Steenstrup. 

 Loligo (pars) Lesueur, Joiirn. 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. Daiiske Videiisk. Relsk. Forh., 1861, pp. 

 70, 85. 



This genus seems to bear about the same relation to Desmotetithis 

 that Rossia does to Seplolii. Its relations Avith Zioligopsls and 

 Leackia 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 fiat, denticulate ; those of the tentacles with sharp, incurved 

 teeth. Eyes large, globular, prominent, lids free and simple. 



Siphon with neither valve, nor dorsal bridle. No external ears, 

 nuchal crests, nor cephalic aquifei'ous 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, PL 26). 

 Verrill, Amer. Journ. Sci., xix, p. 290, 1880. 



Tryon, Amer. Mar. Conch., p. 9, PI. 1, fig. 3 (after Lesueur) ; Man. Conch., i, p. 

 163, PI. 68, fig. 252, PL 69, fig. 253, 1879 (descr. from Gray, figures from 

 Lesueur and D'Orb.). 

 Taonius pavo Steenst., Oversigt Kgl. Danske Vidensk. Selsk. Forli., 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 lai-ge ocellations, which are con- 

 nected together by smaller intermediate ones." Length of mantle, 

 10 inches. 



