ON THREE INTERESTING NEW OEGOPSIDS FROM THE BAY OF SAGAMI. 147 
The hectocotylus is in the left ventral arm, of which one-third of the 
distal portion shows modification to a greater degree ; the suckers of the proxi- 
mal eleven rows arc of normal size and appearance, and those of the remain- 
ing distal sixteen rows are very minute, without the usual shape of suckers, 
but papilla-like, with swollen bases (PI. IV, fig. 10). 
The tentacles show some individual variation in length, according to the 
state of preservation, but they seem to be about half as long as the mantle ; 
the stalk is a little compressed laterally and is nearly quadrangular in 
section, the inner surface being flattened and bounded laterally by sharp 
edges, which are continuous with the protective membranes of the club. The 
clubs are lanceolate, occupying from one-half to one-third the whole length 
of the tentacles, each having a web on the outer surface ; the continuation of 
the web begins as a ridge at each extreme base of the tentacles, and is ex- 
panded on the clubs, bending towards the dorsal sides distally. The suckers 
are arranged in four series and are unequal in size, eight or ten central suckers 
of the hand portion being much larger than the others. They are semicircular, 
with large apertures ; the papillary area has numerous horny striations of the 
same character as in the arm-suckers. In the carpal portion, two mammillary 
protuberances are found in the dorsal side of the sucker-bearing surface, and 
the suckers which exist more proximally than those protuberances, show an 
individiual variation in number from two to eight. The largest central sucker 
of the hand portion is about as large as the marginal ones twice in diameter, 
and is about equal to the largest sucker in the arms ; this sucker has, in all 
the specimens examined by me, only a single triangular tooth of large size 
on the distal-most edge of the horny ring (PI. IV, fig. iia); the marginal 
suckers have about twenty triangular teeth along the whole edge of the ring, 
sometimes with a number of supplemental teeth alternating with them (PI. 
IV, fig. lib). 
The buccal membrane is finely wrinkled and has seven ribs, projections, 
and connectives ; the dorsal connective is divided into two branches near the 
bases of the first pair of arms, and has no membranous septum below, so 
