MUSEUM OF COMPARATIVE ZOOLOGY. 101 
In the smaller specimen, which is a male, the right ventral arm is longer 
than the left, and the tip appears to have been flattened, and. the marginal 
membranes seem. to have been wider, with the edges infolded so as to form a 
sort of furrow on the outer side; but the suckers are mostly gone, and the tip 
is too much injured in both specimens to be accurately described. 
"'entacular arms long, more than twice the combined length of the head and 
body, slender, round, gradually tapering to the tip, like a whip-lash ; the distal 
half of their length ed with very numerous, erowded, minute, pedicelled 
suckers, which cover nearly the entire surface along the terminal portion, 
leaving only a narrow naked line along the back, but farther from the tip 
this naked space becomes gradually wider and the band of suckers narrower, 
and after these crowded bands of suckers cease, scattered suckers, placed mostly 
two by two, extend for some distance along the proximal part of the arms. 
The suckers of the tentacular arms are so small that their form cannot be seen 
with the naked eye; they are deep cup-shaped, with a small circular aperture, 
supported by a horny ring, which is often armed with two or three sharp 
teeth, on one side. 
The pen is pale yellow, thin and slender anteriorly, with two sublateral 
costeo, and with narrow, delicate margins, outside the costo ; in the middle it 
becomes still thinner and narrower, with the margin inrolled ; beyond the 
middle, the margins become much wider, and then unite together ventrally, 
forming a long, hollow, conical portion, extending to the acute posterior tip ; 
this portion is not so broad as deep, and has a slight dorsal keel and a ventral 
groove ; the cavity is filled with a soft, gelatinous substance. 
Color of body and arms, so far as it is preserved in alcohol, deep brownish 
orange : on the upper side of the back and caudal fin the color is better pre- 
served, and shows small ocellated circular spots of orange-brown, with an 
inner circle of whitish, and a central spot of purplish brown. Similar spots 
also exist on the heud and arms, and also on the lower side of the body, where 
the color is best preserved. 
A considerable amount of a bright orange oily fluid, insoluble in alcohol, 
exuded from the viscera, Examined by means of the spectroscope, this fluid 
absorbed part of the green, all of the blue, and most of the violet rays. The 
stomach contained fragments of small Crustacea. 
MEASUREMENTS IN MILLIMETERS. 
Male, Male. 
Total length, to end of sessile arms. . . . . 187. 232. 
Head and body combined. . -s . s . . . 59 122. 
Length of body . . . + QU cit ON 99. 
Length of caudal fin, from origin . . . . . 80. 60. 
Breaath or caudal 3 313 ( de 75. 
DTA GF 2 VENT V AN TL 23. 
Length of dorsal arms |o 2. . 6... v v 24 45. 
Length of 2d pair of arms . , . . , . , 8% 60. 
Length of 8d pair of armsa . 9 0... s. 3% 60. 
