268 A. E. VerriU — North American Cephalopods. 



The nuchal lamellae are formed by a transverse tegumentary fold 

 behind the eyes, from which run backward, on each side, three longi- 

 tudinal lamella?, which are delicate, and have a sensory (perhaps 

 olfactory) function. 



Buccal membrane seven-angled, thin, corrugated on the inner sur- 

 face, destitute of suckers. 



Branchial auricles, 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 sucker-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. 



Ommastrephes illecebrosa VerriU. (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 sagittatm (pars) D'Orbig., Cephal. Acetab., p. 345, Plate 7, figs. 1-3 

 (after Lesueur). 

 Gray {2}ars), 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). 

 Ovimastrephes illecebrosa VerriU, 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, 5a ; 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. 



