A. E. Verrill — North American Ceplialopods. 
363 
of which irsually has a dark-colored spot in the center ; on the sides, 
these tubercles are less prominent and less regular, gradually fading 
out above. The head is decidedly smaller than the body, and smooth 
both above and below. The eyes are prominent, but the external 
opening is small, round, with simple border. The gill-opening is 
large, and extends upward on the sides of the neck to the level 
of the upper sides of the eye-balls. The siphon-tube is completely 
united by its basal portion to the low T er side of the head ; its free por- 
tion is large and elongated, standing out well forward, between the 
bases of the ventral arms. There is a conspicuous aquiferous pore at 
each side of the base of the siphon, just back of the ventral arms. 
The arms are stout, not very long ; the inner surface is broad, with 
two rows of rather widely separated suckers, which run along the 
margins of the arms; the suckers are rather large, and considerably 
raised on stout bases; the first suckers form a regular circle around 
the mouth ; two or three basal suckers are nearly in a single row. 
The suckers are cup-shaped, with a deep central pit, around which 
there are strong radial ridges; toward the base of the arms the soft 
swollen rims of the suckers are wrinkled and lobulated ; farther out 
they are smooth and even. The beak is black, with sharp tips. 
It is surrounded by a thick, wrinkled buccal membrane. 
The arms are slightly united at their bases by a narrow web, which 
also runs along each of the outer angles of the six upper arms, form- 
ing more or less wide marginal membranes, according to the state 
of extension, and by their contractions causing the arms to curl in 
various directions; one of these membranes frequently disappears, 
if the other be so stretched as to become wide, when the arm is 
strongly recurved ; on the ventral arms the upper membrane becomes 
strongly developed, while the lower one is abortive. There is also a 
slight marginal membrane along the inner margins, running between 
the suckers and connecting them together. The dorsal and ventral 
arms are considerably larger and longer than the two lateral pairs, 
the dorsal ones are the stoutest. The two lateral pairs arc about 
equal in size and length. On the dorsal arms there are about 96 
suckers; on the lateral ones about 80, that can be counted with the 
naked eye. The tips are very slender and covered with very minute 
suckers. 
Color of the body and head, above, and of the upper arms, deep 
brownish purple; lower surfaces of body and head, with the siphon 
and ventral arms, pale yellowish. 
The total length of our specimen is 203 ,m " ; of mantle, /» I ; circum- 
Trans. Conn. Acad., Vol. V. 43 July, 1881. 
