ON THREE INTERESTING NEW OEGOPSIDS FROM THE BAY OF SAGAMI. 141 
The hectocotyliis is always in the right ventral arm, about two-thirds of 
the distal j)art showing the modification (PI. IV, fig. la). Along two-thirds 
of the proximal part, there are thirty-four suckers arranged in two series ; 
the middle three or four in each series being smaller than the remaining ones, 
especially with regard to those of the ventral series. The remaining distal 
part has no normal suckers but fifty sucker-bases, swollen into a transverse 
membranous shape, and arranged in two series, those of the ventral series 
being much smaller than those of the dorsal, and each sucker-base being 
provided with a minute papilla on its top. All these sucker-bases are con- 
nected with a median ridge running along between the two series. The 
distal two-thirds of the ventral protective membrane is enlarged and much 
thickened with a sculpture on the outer surface ; the sculpture is composed 
of pits and grooves. There are found along the median line of the outer sur- 
face about fourteen pits, each sending sideways two grooves. Besides these, 
many small round or oval depressions and shallow grooves are found, being 
arranged in a som.ewhat regular manner (PI. IV, fig. 4b). 
The tentacles are about as long as the mantle, though they show some 
variation in length, owing probably to some external cause ; the stem is a 
little compressed laterally and nearly quadrangular in section, the inner sur- 
face being flattened, with a web running from the base along the dorsal outer 
edge, extending to the outer surface of the club, where it becomes a little 
wider and bends towards the dorsal side distally. The clubs, occupying 
about one-third the whole length of each tentacle, are expanded lanceolately 
and show a triangle in section, with protective membranes about as broad as 
the length of the suckers. The suckers of the carpal portion are about twelve 
in number, arranged sparsely in two or three series, extending downwards 
to the exact middle of the tentacle, while all the remaining suckers are dis- 
tinctly in four series. Ten central suckers of the hand portion are about 
thrice as large as the marginal ones in diameter ; the suckers of the distal 
portion are smaller than the marginal ones of the liand portion and are 
arranged in about twenty-seven rows and in four series, of which the more 
