12 AUSTRALASIAN ANTARCTIC EXPEDITION. 
Remarks.—This specimen is rather small for positive determination, but is in fair 
accord with the description of Hoyle’s O. duplex, from Twofold Bay, Australia. The 
following are the more important of the observed discrepancies :— 
(1) The specimen shows only one instead of three tubercles over each eye. 
(2) Though for the most part smooth, there are places where the dorsum shows 
faint traces of papillation. 
(3) I find no evidence of the existence of “an interrupted ridge 
along the ventro-lateral margin of the body.” 
(4) The color is a dark slate grey above, giving way laterally and ventrally 
to a light brownish cream. 
As a possible future aid in confirming or rejecting the identification, a portion of 
the radula is illustrated in text fig. 5. 
Measurements : mm. 
ANSE Ngan 6 bebe Soda btyin toot oho ep tniiidtor tdnGber pds 100 
Tip of body to dorsal base of umbrella ..................... 32 
Length of body (dorsal) .....--.-..65. 2.0 02s ec.s ss seen 24. 
WAGON Gi Ty oA kr hth nd ealdddhe di du Shuapgasoes 19 
AW Attia Ghigitid ee tate ns Quon toce Cea bird Ud atid 10 
PWadltha CROSStey CS mre erretert trtyietene crater cia eta Sian ae ta ante are onto 14 
Ibe We pea foe naneewstsron rn cen wea. gahhte. oe Sart 9 
Mouth to tip of right dorsal arm........................4., 64 
Mouth to tip of left dorsal arm ..............+..+--..005. 64. 
Mouth to tip of right second arm ...........-..eeee eee eee, 71 
Mouth to tip of left second arm ........................... 72 
Mouth to tip of right third arm ....-..-.--.--+--. +s. ee eee. 68 
Mouth to tip of left third arm ..........--......--+-.----. 66 
Mouth to tip of right ventral arm.......................4.. 71 
Mouth to tip of left ventral arm .........-.-..-.+eseeeeeee 68 
Length of umbrella between dorsal arms.........-.-..-.-.+. 16 
Length of umbrella between Woe hate cag draonoed hoods 17 
Genus Moscurres Schneider, 1784. 
A list of the described species of this genus, with an indication of their known 
distribution, is as follows :— 
1. M. cirrhosa (Lamarck, 1799)........ Norway to Mediterranean. 
2. M. moschata (Lamarck, 1799) ...... Mediterranean. 
