^Challenger'' Cephalopoda. 187 



larger teeth, with which smaller ones alternate somewhat 

 regularly ; the lateral bear about ten distant acute teeth on 

 the outer margin, while the proximal and distal groups are 

 similarly armed on the distal margin. 



The Surface is smooth. 



The Colour is a dull yellow with purplish chroraatophores. 



The Gladius is of the usual form, the narrow anterior 

 portion being less than one fourth of the total length. 



Hah. Japan ; purchased in the market, Yokohama. One 

 specimen, ^. 



LoUgo japonica^ Steenstrup, MS. 



The Body is only moderately elongated, being about three 

 times as long as broad, and bluntly pointed behind. The 

 fin is a little more than half the length of the body, about 

 as long as broad, rhomboidal, rounded laterally, and very 

 slightly notched , at the anterior angles. The mantle-margin 

 curves gradually forward to a projecting point in the dorsal 

 median line, and is deeply emarginate ventrally. The siphon 

 is short and of the usual form. 



The Head is comparatively large and rounded ; the eyes are 

 swollen and prominent. 



The Arms are unequal, the order of length being 3, 4, 2, 1, 

 and on an average about half as long as the body ; the first 

 are very small, slender, and rounded j the second have a 

 prominent ventro-lateral angle, not amounting to a keel ; the 

 third have a distinct web on the outer aspect of the distal 

 portion, which is continued backwards as a faint ridge which 

 joins the web lying along the dorsal lateral edge of the fourth. 

 The suckers are in two series, and vary in size in accordance 

 with the arms on which they are situated ; they are subglobular 

 and oblique. The horny ring bears about ten broad, close- 

 set, square-cut teeth. The hectocotylus is present on the left 

 ventral arm ; the distal suckers of the ventral series only are 

 modified into conical papillge, some of which bear a minute 

 sucker at their tips. The umbrella is absent; the buccal 

 membrane is well developed, has the usual seven points, each 

 of which bears a few small suckers (occasionally only one). 

 The outer lip is thick, thicker than the inner ,• both are cut 

 up into papillas along the edge. 



The Tentacles are as long as the head and body together, 

 and have very slender, almost cylindrical stems ; the club 

 occupies about one fourth of the whole length, and is but 

 slightly expanded. The large central suckers are about eight 

 in number and fully twice the diameter of the lateral ones ; 



