[109] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
on each side of it is shorter as compared with the next; six, on the inner 
margin, are minute, and these are connected with the larger series by 
one or two somewhat larger ones at each end of the inner border. 
The stumps of the tentacular arms are flattened, oval, and smooth, 
measuring about 10’ by 18"™ near the base; their length is about 28™@ 
(11 inches), which is doubtless less than half their original length. 
According to Steenstrup (op. ult. cit., p. 81, fig. 2), there are, in his 
example, a few connective suckers and tubercles on the proximal part of 
the club. 
The siphon is very large and lodged in a broad groove in the lower side 
of the head; the anterior part of this groove, which is separated from 
the rest by a transverse fold of the skin, is covered by about twelve nar- 
row, longitudinal ridges, separated by strong longitudinal furrows; an 
additional outer ridge, on each side, is separated from the others by a 
wider interval; several of these ridges and furrows extend backward 
beyond the transverse fold. The dorsal side of the siphon is strength- 
ened by a thick, longitudinal, muscular band, which becomes free from 
the siphon farther back, and is united to the head by a small median 
connective strap; either side of this are the two broad connective bridles, 
and at the sides of the siphon, near the ears, on each side, is a broad 
lateral connection between the mantle and head, with a large aquiferous 
opening beneath it. 
The exposed parts of the jaws (Plate XVII, figs. 3, a, b) are black and 
polished; the lamin are reddish brown, with broad, thin, yellowish- 
white margins, The upper mandible has a long, sharp rostrum, with reg- 
ularly curved cutting edges, and a small, well-defined, V-shaped notch, 
from which a short groove runs backward, beyond which there is a slight 
ridge ; anterior edge of ale, beyond the notch, forming no distinct lobe 
or tooth, but slightly convex and irregularly crenulate; posterior lateral 
borders of ale with a broad sinus in the middle; palatine lamina long 
and thin, with sinuous posterior margins; frontal lamina broad, extend- 
ing well backward. 
The total length of the upper mandible is 42™™; tip to posterior end 
of frontal lamina, 33™"; to notch, 10™™; greatest breadth (or hight), from 
palatine to end of frontal, 30™™; transverse breadth, across frontal, 
15™"; transverse breadth, across anterior edges of ale, 8™™. 
The lower mandible has a strongly incurved beak, with the cutting 
edges rather suddenly incurved at about the proximal third, and a well- 
developed, broad, V-shaped notch at base, beyond which there is a 
slightly prominent, broad tooth; ale broad, the inner ends broader 
than the middle, well rounded; mentum short, with a broad dorsal 
emargination; gular lamina short, the inner edges incurved. 
The total length of the lower mandible is 29™™; tip of beak to end of 
mentum, 10"; to ventral end of gular, 21™™; to bottom of notch, 11™™; 
to inner ends of ale, 24™™; breadth, from inner ends of alee to mentun, 
28™™; breadth of gular lamina, 17"™™; breadth of alz, 12.5°™; greatest 
