368 A. E\ Verrill — Earth American Cephalopoda. 
and large, elongated pyriform, attached singly or in clusters by the 
small end. 
In addition to the several small species described here, a much lar- 
ger rough-backed species has been taken several times at Fort Macon 
and near Beaufort, X. C. This is probably Octopus rugosus Bose, a 
West Indian species. 
Octopus Bairdii Yen-ill. 
Octopus Bo.irdii Yerrill. Amer. Jour. Sci., v, p. 5, Jan.. 1873: xix, p. 294, 1880; 
American Naturalist, vii. p. 394. figs. 76. 77, 1873 ; Am. Assoc. Adv. Sci. for 
1873, p. 348. pi. 1, figs. 1. 2. 1874. 
G. 0. Sars. Mollusea Regionis Arctic* Norvegiae, p. 339. pi. 33, figs. 1-10 ( 2 ), pi. 
xvii, figs. 8a to 8 d (dentition and jaws), 1878. 
Tyrou. Man. Concli.. i. p. 116, pi. 32. figs. 37, 38 (description and figures from the 
papers by A. E. Y.). 
Yerrill, Bulletin Mus. Comp. Zool.. viii. p. 107, pi. 2, figs. 4, 4a; pi. 4, figs. 1, la, 
1881. 
Plate XXXIII. figs. 1. la. Plate XXXIY. figs. 5. 6. Plate XXXYI, fig. 10. 
Plate XXXYIII. fig. 8; Plate XLIX. figs. 4, 4a; Plate LI, figs. 1, la. 
The body is short, thick, somewhat depressed, broadly rounded 
posteriorly, separated from the 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 papillae 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 
larger 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. 
