[115] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
MASTIGOTEUTHIS Verrill. 
Trans. Conn. Acad., vol. v, p. 296, Jan., 1881; Bulletin Mus. Comp. Zool., vol. viii, p. 
100, March, 1881. 
Body elongated, tapering to a point, confluent with the caudal fin 
posteriorly. Caudal fin very large and broad, rhomboidal, occupying 
about half the length of the body. Mantle fastened to the base of the 
siphon by an ovate, ear-shaped, elevated cartilage, on each side, fitting 
into corresponding deep, circumscribed pits on the base of the siphon. 
Siphon with a bilabiate aperture, an internal valve, and a pair of dorsal 
bridles. Eyes large, with round pupils; lids free, thin, apparently with 
a very small anterior sinus. Arms very unequal, the ventral ones much 
the longest. Suckers small,in tworegular rows. Tentacular arms long 
and round, tapering to the tips, shaped like a whip-lash, without any 
distinct club; the distal portion is covered nearly all around with ex- 
ceedingly numerous and minute suckers, which leave only a very narrow 
naked line along the outside. Pen narrow and bicostate anteriorly, very 
slender in the middle; posteriorly much larger, with a long tubular 
cone (figs.1b,1¢). This remarkable genus differs widely from.all others 
hitherto described in the character of the tentacular arms and suckers. 
This, with the great size of the caudal fin, gives a very peculiar aspect to 
the species. 
Mastigoteuthis Agassizii Verrill. 
Bulletin Mus. Comp. Zool., vol. viii, p. 100, pl. 1, fig. 1, pl. 2, figs. 2, 3-3 e, 1881; 
Trans. Conn. Acad., vol. v, p. 297, pl. 47, pl. 49, figs. 2, 3-3 e, Jan., 1881. 
Plate XXI. Plate XXII, figures 2-2 d. 
Body elongated, round anteriorly ; posteriorly tapering rapidly to the 
slender, acute, terminal portion, which is confluent with the caudal fin 
to the tip. Front ‘dorsal edge of mantle emarginate in the middle. 
Caudal fin very large and broad, transversely rhomboidal, obtuse pos- 
teriorly, its length, from origin to tip, about equal to half the combined 
length of the head and body. LHyes large, with thin lids, which appear 
to have had a distinct but very small sinus in front; pupils circular ; 
iris brown, in alcohol. Sessile arms very unequal; ventral arms much 
larger and longer than the others, about equal to length of head and 
body; dorsal arms very small, scarcely one-third the length of the ventral 
pair; two lateral pairs nearly equal, decidedly longer and stouter than 
the dorsal pair. A delicate, thin, marginal membrane extends along the 
arms, outside the rows of suckers, to the slender tips. Suckers small, 
in two regular rows on all the arms, subglobular, with small oblique 
apertures, surrounded by small horny rings, which have a nearly entire 
margin, and by several series of minute plates (Plate XXII, fig. 2 d). 
Basal web, between the arms, very small. 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 
