EEPOET OF COMMISSIONEE OF FISH AND FISHEEIES. [ 180 ] 
be counted with the naked eye. The tips are very slender and covered 
with very minute suckers. 
Color of body and head above, and of upper arms, deep brownish 
purple; lower surfaces of body and head with siphon and ventral arms, 
pale yellowish. 
A fine specimen of this interesting species was taken in Vineyard 
Sound, Mass., by Mr. V. X. Edwards, in 187G. It was not known pre¬ 
viously from the American coast, and has been regarded as peculiar to 
the Mediterranean and West Indies. The total length of this specimen 
is 203 millimeters; of mantle, 51 millimeters; circumference of body, 152 
millimeters; length of dorsal arms, from eye, 137 millimeters; second 
pair, 91 millimeters; of third pair, 81 millimeters; of fourth pair, 131.5 
millimeters. 
The remarkable tubercles of the ventral surface mostly have five ridges 
converging to each, rarely six. In all other respects it agrees with the 
figures of Ferussac and D'Orbigny. According to Targioni-Tozzetti, P. 
catenulata is distinct from P. tuberculata. If so, our species should bear 
the former name. Steenstrup. considers Octopus carena Yer., the male. 
Family ALLOPOSIDaE Verrill. 
Trans. Conn. Acad., v, p. 365, 1881. 
Body thick, obtusely rounded; arms extensively webbed; mantle 
united directly to the head, not only by a large dorsal commissure, 
but also by a median-veutral and two lateral longitudinal commissures, 
which run from its inner surface to the basal parts of the siphon. The 
male hectocotylized right arm of the third pair is developed in a cavity 
in front of the right eye, and when mature, protrudes from an opening 
on the inner surface of the web, between the second and fourth pairs of 
arms, and finally becomes detached. It is furnished with two rows of 
large suckers, and with a fringe along the sides. The mode of attach¬ 
ment of the mantle to the head is similar to that of Desmoteuthis , among 
the ten-armed cephalopods. 
ALLOPOSUS Verrill. 
Alloposus Verrill, Amer. Journ. Sci., xx, p. 393, Nov., 1880; Proc. Nat. Mus., iii, p. 362, 
Dec., 1880; Bulletin Mus. Comp. Zool., viii, p. 112, March, 1881; Trans. Conn. Acad., v, 
p. 365. 
Allied in some respects to Philonexis and Tremoclopus. Body thick 
and soft, smooth; arms (in the male only seven) united by a web ex¬ 
tending nearly to the ends. Suckers sessile, simple, in two rows; mantle 
united firmly to the head by a dorsal, ventral, and two lateral muscular 
commissures, the former placed in the median line, at the base of the 
siphon; free end of the siphon short, well forward. 
In the male, the hectocotylized right arm of the third pair is devel¬ 
oped in a sac in front of the right eye (Plate XXXIX, figs. 1, la); as 
found in the sac, it is curled up, and has two rows of suckers; the 
