[19 ( J] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
SUPPLEMENT. 
After the preceding pages were put in type, a number of additional 
specimens were received, some of them of great interest. Among these 
there are some forms that appear to have been previously unknown. 
These are, therefore, described in this place. Moreover, several papers 
have been published, on the same subject, during the printing of this 
report. Some of these include certain of the species above described, 
and, therefore, may well be noticed here. 
ARCHITEUTHIS Harting, 1861. (See pp. [25], [114].) 
Architeuthus Steenstrup, Forhandl. Skand. Naturf., 1856, vii, p. 182, 1867 (no descrip¬ 
tion ) 
Plectoteuthis Owen, Descriptions of some new and rare Cephalopoda. Part II. 
< Trans. Zool. Soc. London, xi, part 5, p. 156, pi. 34,35, June, 1881. 
Professor Owen, in the paper quoted, has given a somewhat detailed 
description, with figures, of the large cephalopod arm, long preserved 
in the British Museum. This arm had previously been pretty fully 
described by Mr. Saville Kent, in 1874, whose description has already 
been quoted by me. (Seepp. [57-59].) Professor Owen, like Mr. Kent, 
fails to state to which pair of arms the specimen belongs. This is a 
very important omission, for in Architeuthis, as in many other genera, the 
arms belonging to different pairs differ in form and stiucture. The de¬ 
scribes of this arm would, doubtless, have been able to ascertain to 
which pair it belongs by a direct comparison with the arms of Ommas- 
treplies , or any other related form. For this arm, Professor Owen en¬ 
deavors to establish a new genus and species ( Plectoteuthis grandis). 
The genus is based mainly on the fact that there is a marginal crest 
along each outer angle, and a narrow protective membrane along each 
side of the sucker-bearing face. These peculiarities are precisely those 
seen in the ventral arms of Architeuthis , and have already been described 
by me in former articles, and in this report (see pp. [35], [37], [44]), both 
as found in A. Harveyi and A. princeps. Similar membranes or crests 
are found on the dorsal arms of Sthenoteuthis pteropus (see PI. XVII, fig. 
7 a), and other related species. 
The suckers on the arm, as described and figured by Professor Owen, 
are like those of Architeuthis. Therefore there is no ground whatever 
for referring this arm to any other genus , and Plectoteuthis must become 
a synonym of Architeuthis. 
Whether the arm in question belongs to a species distinct from those 
already named, I am unable to say. There is, apparently, nothing to 
