318 
A. E. Verrill — North American Cephalopods. 
A medium-sized male specimen, recently preserved in alcohol, 
measured 1 45 mno from the base of the dorsal arms to the posterior end 
of the body ; length of body, 120 mm ; length of caudal fin, 70 n,m ; 
breadth of fin, 75 mui ; length of first pair of arms, 42 mm ; of second 
pair, 50"‘ m ; of third, 60 mm ; of ventral pair, 53 mni ; of tentacular 
arms, 150 rnm . (For other measurements see tables B to E.) 
Astoria, Long Island, 1870, (Robert Benner). 
This form has been received, hitherto, only from the western part 
of Long Island Sound, where it is abundant with the schools of 
menhaden, on which it feeds. 
Reproduction of lost parts. 
I have observed in this species, as well as in Ommastrephes illece- 
hrosus , numerous instances in which some of the suckers have been 
torn oft' and afterwards reproduced. In such examples new suckers 
of various sizes, from those that are very minute up to those that are 
but little smaller than the normal ones, can often be found scattered 
among the latter, on the same individual. It seems to me possible 
that some of the specimens having the suckers on the tentacular arms 
unusually small, may have reproduced all those suckers, or still more 
likely, the entire arm. 
I have seen specimens of this species, and also of 0. illecehrosus , 
which, after having lost the tips, or even the distal half of one or 
more of the sessile aims, have more or less completely reproduced the 
lost parts.* In such cases the restored portion is often more slender 
and has smaller suckers than the normal arms, and where the old part 
joins the new there is often an abrupt change in size. Probably this 
difference would wholly disappear, after a longer time. 
An unquestionable and most remarkable example of the reproduc- 
tion of several entire arms occurs in a small specimen taken off New- 
port, R. L, Aug., 1880. This has the mantle 70 mra long; dorsal arms 
22“"", 3d pair of arms 30 m,, “. The three upper pairs of arms are per- 
fectly normal, but both the tentacular and both the ventral arms 
have evidently been entirely lost and then reproduced, from the very 
base. These four arms are now nearly perfect in form, but are 
* Perhaps the Dosidicus Eschrichiii Steenstrup is only an Ommastrephes or Sthenoteu- 
this which had lost and par ially reproduced the tips of all the arms. Aside from the 
solid cone of the pen. characters have not been given sufficient to distinguish it 
generically. My former reference of this species (p. 250) to the Teuthidce, was an 
error, due to the brevity of ihe original description. 
