A, FE. Verrill—Mollusca of the New England Coast. 403 
angular, median lobe; at the eyes the lateral margin recedes in a 
broad curve, but projects forward in an angular point below each 
eye, while the ventral portion is cut away in a broad curve, so as to 
expose the tip of the siphon. The head is short, broad, swollen 
laterally, owing to the large size of the eyes, which are furnished 
with free lids, having a small angular sinus in front. The siphon is 
short and broad, with a smooth, shallow cavity behind it, without 
any distinct bridles; within, it has a well-developed valve. 
The arms are small and short, the ventral ones largest and longest ; 
the two lateral pairs are nearly equal; the dorsal pair decidedly the 
shortest and smallest. The arms are united at the base by a rudi- 
mentary web; they are somewhat angular at base and taper some- 
what rapidly to slender tips; the imner surface is thickly covered 
with very small suckers, which appear to form about four irregular 
rows. The lateral arms have a narrow, membranous keel along the 
outer side, and all have narrow marginal membranes along the sucker- 
bearing surface. The tentacular arms are very long and slender, 
many times the length of the sessile arms, but more slender; they are 
rounded and of nearly uniform size throughout; the sucker-bearing 
portion is neither expanded into a club nor distinctly flattened, but 
bears a large number of very minute suckers arranged in many rows 
along the inner surface, the number of rows diminishing proximally. 
Color, in alcohol, dark reddish brown over the entire surface of the 
body, head, and sessile arms, with the tentacular arms yellowish 
white. The color is due to very numerous and densely crowded 
chromatophores of rather large size. The color is most intense on 
the upper surfaces of the head and sessile arms ; the lower side of the 
body is somewhat paler than the upper side. The eyeballs outside 
of the pupil are dull blue. 
Length of a female specimen, from the posterior end to the anterior 
dorsal edge of the mantle, 57"™"; from the posterior end of the body 
to the anterior insertion of fins, 9°"; to the posterior insertion, 2°5"™ ; 
length of fin, 7™™; breadth across both fins, about 26™"; breadth 
across mantle anteriorly, 21"; length of head from dorsal cartilage 
to base of dorsal arms, 17™™; from anterior edge of mantle to base 
of dorsal arms, 8™"; length of dorsal arms, 20""; length of second 
pair, 23""; length of third pair, 23"™; length of ventral arms, 25™™ ; 
length of tentacular arms, 85™"; greatest diameter, 2""; length of 
sucker-bearing portion, 13"; its diameter, about 1™™. 
Off Martha’s Vineyard, at stations 2189 and 2205, in 600 and 
1,073 fathoms (Nos. 39,967 and 39,968). 
