268 
A. E. Verrill — North American Cephalopoda. 
The nuchal lamella are formed "by a transverse tegumentary fold 
behind the eyes, from which run backward, on each side, three longi- 
tudinal lamella, which ax-e delicate, and have a sensory (perhaps 
olfactory) function. 
Buccal membrane seven-angled, thin, corrugated on the inner sur- 
face, destitute of suckers. 
Branchial aui-icles, and gills large. Liver and stomach voluminous. 
The male has one of the ventral arms (which may be either right 
or left in our species) hectocotylized near the tip, by enlargement 
and flattening of the bases of the suckei’-stalks, while their cups 
become small or abortive. 
The female has oviducts developed on both sides, but they are 
small, and simple, opening far back. Two pairs of nidamental glands, 
which are small and simple. 
Ommastreph.es illecebrosa Verrill. (Short-finned squid.) 
Loligo illecebrosa Lesueur, Journ. Phil. Acad. Nat. Sci., ii, p. 95, Plate 10, figs. 
18-21, 1821 (figures incorrect). 
Blainville, Diet, des Sci. nat., vol. xxvii, p. 142, 1823. 
Gould, Invert. Mass., ed. I, p. 318, 1841 (habits). 
Loligo piscatorum La Pylaie, Ann. des Sci. nat., iv, p. 319, 1825, Pi. 16 (habits as 
observed at Saint Pierre). 
Ommastrephes sagittatus (pars) D’Orbig., Cephal. Acetab., p. 345, Plate 7, figs. 1-3 
(after Lesueur). 
Gray (pars), Catalogue Moll, of British Mus., Part I, Cephal. Antep., p. 58, 1849. 
Binney, in Gould’s Invert. Mass., ed. II, p. 510, 1870 (excl. syn.), PI. 26, figs. 
341-4 [341 is imperfect],* not Plate 25, fig. 339. 
Tryon (pars), Man. Couch., I, p. 177, PI. 78, fig. 342 (very poor, after Lesueur), 
PI. 79, fig. 343, 1879 (not Plate 78, figs. 341, 345). 
Ommastrephes illecebrosa Verrill, Amer. Jour. Sci., vol. iii, p. 281, 1872 (synonymy); 
Report on Invert. Viney. Sd., etc., 1873, pp. 441 (habits), 634 (descr.) ; Amer. 
Jour. Science, vol. xix, p. 289, April, 1880. 
Plates XXVIII ; XXIX, figs. 5, 5 a ; XXXVII, fig. 8 ; XXXIX. 
Body, in the younger specimens, long and slender; in the adults, 
especially when the stomach is distended with food, and in the 
breeding season, rather stout; most so in the gravid female; in pre- 
served specimens the apparent stoutness of the body depends very 
much upon whether the mantle was in a contracted or expanded 
* This species is not well figured in the last edition of Gould’s Invertebrates. Plate 
25, fig. 339, which Mr. Binney refers to it, really represents a Loligo. Plate 26, figs. 
341-344 (erroneously referred to Loligopsis pavo), was doubtless made from a specimen 
of this species, but if so, the long arms were incorrectly drawn, and confused with 
the short arms. 
