2G0 A. E. Verrill — North American Cephalopods. 
ish white ground-color between them. The outer buccal membrane is 
darker; the inner surfaces of the arms are whitish ; the peduncular 
portions of the tentacular arms have fewer color-specks, and are paler 
than the other arms. 
Reproduction of lost parts. 
This creature had been badly mutilated long before its death, as 
its healed wounds show, and to this fact many of the imperfections 
of the specimen are due. At the time of its death, or subsequently, 
the extremities of the ventral arms and of the third right arm appear 
to have been destroyed, besides other injuries. But both the dorsal 
anus and both the lateral arms of the left side had previously been 
truncated at 12 to 13 inches from their bases. The ends had not 
only healed up entirely, but each one had apparently commenced to 
reproduce the lost portion. The reproduced part consists, in each 
case, of an elongated, acute, soft papilla, arising from the otherwise 
obtuse end of the arm. At its base one or two small suckers have 
already been reproduced, and minute rudiments of others can be 
detected on some of them. Whether these arms would have been 
perfectly restored in course of time is, perhaps, doubtful,* but there 
can be no doubt that a partial restoration would, at least, have been 
effected. On the basal half of several of the arms some of the 
suckers had also been previously lost, and these were all in the pro- 
cess of restoration. The restored suckers were mostly less than one 
half the diameter of those adjacent, and in some cases less than one- 
third. Among the restored suckers were some malformations. One 
has a double aperture, with a double horny rim. In one case two 
small suckers, with pedicels in close contact, occupy the place of a 
single sucker. In another instance a small pedicelled sucker arises 
from the pedicel of a larger one, near its base. 
The arms and suckers. 
With the exception of the left arm of the second pair, none of the 
sessile arms have their tips perfect. Therefore it is not possible to 
give their relative lengths. The dorsal arms are the stnallest at base 
and the third pair largest. They are all provided with a rather nar- 
row marginal membrane along each border of the front side. These 
membranes are scarcely wide enough to reach to the level of the rims 
of the suckers, though they may have done so in life. The front 
margin, bearing the suckers is narrow on all the arms, but relatively 
* That mutilations of the arms in species of Octopus are regularly restored is well- 
known, but it has been doubted whether this occurs in the ten-armed forms. 
