A, E. Verrili—Cephalopoda of North America. 289 
The genus Sthenoteuthis, established to receive this species, 
differs from Ommastrephes, to which it is closely allied, in hav- 
ing, like Architeuthis, numerous small, smooth-rimmed’ suckers 
alternating with tubercles, on the proximal part of the ‘club,’ 
for the mutual adhesion of the long tentacular arms. The lat- 
arms are provided with very broad, thin marginal mem- 
branes. The caudal fin is very broad. Besides the type it 
Ommastrephes ‘illecebrosa Verrill. (Short-finned squid). 
Loligo illecebrosa Lesueur, Journ. Phil. Acad. Nat. Sci., ii, p. 95, Plate x, figs. 
d, Invert. Mass., ed. I, p. 318, 4 
Ommastrephes sagittatus (pars) D’Orbig., Céph. Acétab., p. 345, Plate 7, fig. 1, 
Lesueur). Binney, in Gould’s Invert. Mass., ed. II, p. 510, 1870 (excl. 
syn.). Plate xxvi, fig 341-4 [341 is imperfect], not Plate xxv, fig. 339. Tryon 
(pars) Man. Conch., I, p. 177, PL. 78, fig. 342 (very bad, after Lesueur), Pl. 79, 
fig. 343, 1879 (not Plate 78, figs. 341, 345). 
mastrephes illecebrosa Verrill, this Journal, vol. iii, p, 281, 1872; Report on 
Invert. Viney. Sd., ete., 1873, pp. 441, 634. 
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e Mediterranean form, usually identified with the var. 6, 
of Loligo sagittata Lamare , 1799,¢ is closely related to our 
Species, but if the published figures and descriptions can be re- 
led upon, it can hardly be identical. The American form has 
&more elongated body, with a differently shaped caudal fin, 
which is relatively shorter than O. sagittatus, as given by Huro- 
pean authors. The figure given by Verany is, however, an ex- 
ception in this respect, for in that the body is represented about 
as long as in some of our larger specimens. : 
Of our species, I have measured large numbers of specimens, 
Preserved in different ways, and also fresh, and have found no 
great variation in the form and relative length of the caudal 
nh, among specimens of similar size, nor do the sexes differ 
* A specimen from Bermuda is described in detail in Trans. Conn. Acad., vol. v, 
P. 228, but it lacked the ‘ clubs.’ ate 
Tt seems more probable, however, that Lamarck’s description applied, in part, 
e 
Bar: (Les. sp.) of the Gulf Stream region. Blainville thus applied it. 
} It should be remarked, however, that Lesueur’s figure of O a shows 
the body too small and short in proportion to the fin, 
in shape, and occupying more than half the length of the mantle; the propor- 
tions of the arms are al erroneous. But ur explains these defects b 
statement that the figures were hasty sketches made for th 
_ ved a specimen whic 
be ription, but the specimen saved turned out to be BE pavo, 80 
that the original sketches were published without correction figure 34 
