22 AUSTRALASIAN ANTARCTIC EXPEDITION. 
Hectocotylus very minute, both calamus and ligula bluntly conical, the latter with 
five or six fleshy but mostly rather obscure transverse grooves (text fig. 16). 
Surface very closely and harshly papillose over the entire dorsal integument, the 
papillze gradually diminishing in size and number laterally and absent from most of the 
ventral surface, though extending well down the umbrella and along the outer margins 
of the ventral arms. Individual papillze small, mostly simple, bluntly conical in outline, 
and very distinct. There is a large, bluntly conical, papillose tubercle just above the 
posterior angle of the eyelid (text fig. 18), and a similar smaller one just above the 
anterior angle. A few scattered and very obscure tubercles larger than the ordinary 
papillze occur elsewhere on the dorsum. A low; but very distinct subperipheral fold 
begins near the mantle margin and extends all around the body, forming a fairly accurate 
dividing line between the papillose and non-papillose areas. 
inte ene. 
pac ro. 2 ee , an 
Fig. 17.—M. aurore. Fig. 18.—M. aurore. 
Region between eyes. Region obliquely above left eye. 
Color of body a dark slaty grey above, clouded with dim mottlings of a warmer tint, 
but becoming very pale ventrally and on the inner surfaces of the arms. Chromatophores 
exceedingly minute, very closely and evenly distributed above, but invisible over much 
of the light-colored areas. 
Beak stout, mandibles black (text fig. 19). 
lcm. 
Fig. 19.—M. aurore. 
Mandibles. 
Radula well developed, but transparent, and takes stain poorly (potassium 
bichromate). Rhachidian teeth helmet shaped, with acute points and distinct lateral 
cusps. First laterals weakly developed, very indistinct in outline. Second laterals 
‘ with triangular teeth. Third laterals with long, curved, knife-shaped teeth. (Text 
fig. 20.) 
