292 " ENDEAVOUR " SCIENTIFIC RESULTS. 



and cirri light yellowish brown, contrasting strongly with 

 the general slaty hue. Small specimens from off Eucla 

 differing in that the light ring round the mouth is more sharply 

 marked off from the dark mouth region and the dark area 

 outside ; the aboral surface furthermore a uniform grayish 

 white without evident pigmentation, except for a series of 

 3-7 tiny ocellar spots running from the body out toward the 

 tip of each arm, each areola (PL Ixxxi., figs. 6-7) showing a 

 small, clear central area as in 0. pluto, often appearing slightly 

 elevated, but each areola as a whole much more minute. 



PferopaUial cartilage (PI. Ixxxii., fig. 10) in general similar 

 to that described for 0. pluto, but relatively shallower, 

 broader, and thinner, the fin attachments narrower, and the 

 lateral flattenings, though somewhat more excavated, not so 

 abrupt ; peripheral groove also apparently somewhat shal- 

 lower, though a more accurate description and drawing than 

 that offered is prevented by the extremely soft and brittle 

 condition of the specimens. 



Mandibles (Fig. 67) and biiccal 

 mass relatively small, much 

 smaller than in the dissected 

 specimen of 0. pluto, though the 

 latter is a smaller animal ; 

 upper mandible also differing in 

 Fig. (u.—OpisthoicHthis per- the possession of a distinct angle 



7'Zn^.f:j: ™°'"' """"""^ -'«g «-h outer «ide of the beak 



at the shoulder. 



Branchia' six on one side, six + one poorly developed on 

 the other. Pallial muscle back of funnel extremely weak. 



T^ype.— Specimen E5718 [S.S.B. 480], in the collection of 

 the Australian Museum, Sydney. A para type [S.S.B. 482] 

 has been retained by the writer. 



Type Locality. — 260 fathoms, 42 miles south and east of 

 Genoa Peak, Victoria (" Endeavour ") ; three specimens. 



Recorded Distribution. — 232-260 fathoms, off Genoa Peak, 

 Victoria (" Endeavour ") ; 150-300 fathoms, off Eucla, 

 Western Australia (" Endeavour "). 



Remarks. — ^The more tangible characteristics by which this 

 exceedingly interesting octopod may be distinguished from 

 its accompanying relative, 0. pluto, are the small, even-sized 

 suckers, the distinctive coloration more especially over the 

 oral aspect of the arms and web, the firm composition of the 



