368 A. E. Verrill — North American Cephalopods. 



and large, elongated pyrifoim, attached singly or in clnsters by the 

 small end. 



In addition to the several small species descrilje<l here, a much lar- 

 ger rough-backed species has been taken several times at Fort Macon 

 and near Beaufort, N. C This is probably Octopus rugosris Bosc, a 

 West Indian species. 



Octopus Bairdii Veniii. 



Odo-pus Bairdii Verrill, Amer. Jour. 8ci., v, p. 5, Jan., 1873; xix, p. 294, 1880; 



American Naturalist, vii, p. HOi, figs. TO, 77, 187:J ; Am. Assoc. Adv. Sci. for 



1873, p. 348, pi. 1, figs. 1, 2, 1874. 

 G. 0. Sars, Mollusca Regionis Arcticas Norvegiaj, p. 339, pi. 33, tigs. 1-10 ( ? ), pi. 



xvii, figs. 8a to %d (dentition and jaws), 1878. 

 Tyron, Man. Conch., i, p. 116, pi. 32, figs. 37, 38 (description and figures from the 



papers by A. E. V.). 

 Verrill, Bulletin Mus. Oomp. Zool., viii, p. 107, pi. 2, figs. 4, 4a; pi. 4, tigs. 1, la, 



1881. 



Plate XXXIII, figs. 1, la. Plate XXXIV, figs. 5, 6. Plate XXXVI, fig. 10. 

 Plate XXXVIII, fig. 8; Plate XLIX, figs. 4, 4a; Plate LI, figs. 1, la. 



The body is short, thick, somewhat depressed, broadly rounded 

 posteriorly, separated from tlie head only by a slight constriction at 

 the sides. Head almost as broad as the body, swollen above and 

 around the eyes, concave in the middle above ; around the eyes, and 

 especially in front and above, there are numerous small, conical, often 

 irregular and rough tubercles; a little removed from the upper side 

 of each eye, is a much larger, rough, irregularly conical, erectile cirrus, 

 which has some small, more or less prominent, conical papilla? on 

 its surface ; the whole upper surface of the body, head, and arms is 

 also covered with minute scattered papillae, which are usually but 

 little prominent, but in some of the larger males they become much 

 laro-er and more numerous, and have the form of small prominent 

 warts. 



The jaws (Plate XLIX, fig. 4a) have rather blunt, slightly incurved 

 tips, with the angle at the bases of the cutting edges round and with- 

 out any distinct notch. The odontophore, (Plate XLIX, fig. 4) has a 

 median row of large, acute teeth, with broad bases without lateral 

 denticles; the inner lateral teeth are much smaller, with curved acute- 

 triangular points ; outer lateral teeth longer and more acute ; mar- 

 ginal plates large and distinct. 



Siphon large, tapering, capable of being bent in all directions, so 

 as to be used for swimming either forward, backward, or sideways, 

 according to its direction. 



