39(3 PROCEEDINGS OF THE ACADEMY OF [July, 



but differs from them so conspicuously in several quite important 

 characters that I feel considerable uncertainty as to whether it is 

 specifically identical with them. 



There is a large irregular tubercle over each eye, but except for 

 this the skin is almost perfectly smooth. At various points on the 

 dorsal surface, however, are to be observed a few small scattered 

 pit-like indentations resembling impressed papilla?, most conspicuous 

 being a diamond-shaped group of four on the middle of the back. 

 The arms are about three and a half times as long as the head and 

 body and very unequal, though this appears to be clue to the fact 

 that many of them have been mutilated and are undergoing regenera- 

 tion. The enlarged suckers and hectocotylus are similar to those 

 just described for P. areolatus. The color is exceedingly dark and 

 the heavy pigmentation extends over even the inner surfaces of the 

 aims and periphery of the suckers, so that the pale inner surfaces 

 of the latter stand out very conspicuously against the slate-colored 

 background. The ocular markings are nearly circular, and the 

 inner light colored ring is nearly as wide as the one enclosing it. 

 There are also traces of another light colored zone or ring outside 

 the latter. The inmost dark core is conspicuously smaller than in 

 the specimens described above. 



The dimensions are as follows: 



mm. 



Total length 340 



Length of body (dorsal) 53 



Width of body 50 



Width of neck 32 



Width of head 37 



Length of right dorsal arm 230 



Length of left dorsal arm 260 



Length of right second arm 200 



Length of left second arm 265 



Length of right third arm 102 ! 



Length of left third arm 160* 



Length of right ventral arm HO 3 



Length of left ventral arm 240 



Length of hectocotylus 3 3 



Length of umbrella between dorsal arms 33 



Length of umbrella between ventral arms 32 



Diameter of oculation, maximum ll|x 14 



Diameter of oculation, excluding outermost light ring 8 x 10 



3 Regenerating. 



