16 
AUSTRALASIAN ANTARCTIC EXPEDITION. 
Surface everywhere smooth, the few wrinkles present being obviously due to con¬ 
traction consequent to preservation. Integument colorless, thin, delicate, very loosely 
adherent, and hence easily delaminated from the subjacent tissues, especially between 
the arms. 
Color of the alcoholic specimen, everywhere a livid greyish-white, the eyeballs 
showing slaty purple through the supervening tissues. 
Mandibles stout and black, their general outline as in the figure (text fig. 8). 
Fig. 8.— M. albida. 
Mandibles. 
Radula relatively delicate and transparent, taking stain (an aqueous solution of 
potassium bichromate) with difficulty. Rhachidian teeth more or less hat-shaped, 
broadly flaring at the base, and with sharp, simple, regularly tapering points. First 
laterals weak, blunt, squarish, their outer angles more conspicuously developed than 
their inner. Second and third laterals better developed, their large teeth resembling 
one another in size and in their nearly triangular outline. (Text fig. 9.) 
Measurements: mm. 
Total length. 170 
Length of body (dorsal). 35 
Tip of body to base of dorsal arms ... 45 
Width of body. 40 
Width of neck. 29 
Width across eyes. 31 
Length of funnel. 12 
Mouth to tip of right dorsal arm.. . 105 
Mouth to tip of left dorsal arm . 129 
Mouth to tip of right second arm . 127 
Mouth to tip of left second arm. 124 
Mouth to tip of right third arm. 127 
Mouth to tip of left third arm . Ill 
Mouth to tip of right ventral arm. 73+ 
Mouth to tip of left ventral arm . 117 
Length of umbrella between dorsal arms. 37 
Length of umbrella between ventral arms. ...... 27 
