MOLLUSCA.—HEDLEY. 
41 
On the upper surface the animal of P. coruscans is black, and on the under cream. 
Just above the tip of the tail the epip odium commences and continues without 
interruption to the ocular tentacles. The hinder part is a thick crest, tuberculate at 
the edge where three pairs of epipodial tentacles arise from sheaths. Two of these 
tentacles are beside and one in front of the operculum. Anterior to this latter, the 
epipodium changes to a thin free cervical lobe hanging loose over the foot and bound 
to the ocular tentacle for almost its full length. This cervical lobe has a simple unfringed 
margin on both left and right sides, and on each side it conceals a cervical papilla. Under 
the right ocular tentacle is another projection, apparently the cephalic organ. On 
the muzzle are two free lobes which do not meet in the centre but ascend on either side 
to form a sinus around the cephalic tentacle and junction with the ocular tentacle. 
Radiacmea macquariensis sp. nov. 
(Plate VL, figs. 62, 63.) 
Shell small, rather solid, oblong-ovate, moderately elevated, apex in front of the 
centre. Colour : one specimen is purple pink with dark and light concentric zones; 
another is white with chocolate zones and pink apex, interior pale mauve. Sculpture : 
about 60 depressed radial riblets parted by narrow grooves which notch the margin. 
Both riblets and interstices are crossed by fine and dense concentric threads. External 
sculpture imprinted on the interior surface, muscle-scars definite. A narrow margin 
to the inner lip is not covered by a callus sheet extending over the rest of the interior. 
Length, 12 ; breadth, 9-5 ; height, 5mm. 
Four specimens were collected on rocks at Macquarie Island by Mr. H. Hamilton. 
Nearest to this seems to be R. campbelli Filhol, from Campbell Island, which is 
smaller, rounder, and less solid. 
Lepeta coppingeri Smith. 
Lepeta coppingeri Smith, Proc. Zook Soc., 1881, p. 35, pi. iv., fig. 12 ; Id., Pilsbry, Man. 
of Conch., xiii., 1891, p. 71, pi. xxxix., figs. 20, 21 ; Id., Thiele, Deutsch. Siidpol. 
Exped., xiii., 1912, pp. 185, 233, and 257 ; Id., Smith, “ Terra Nova ” Exped. 
Zook, ik, 1915, p. 62. 
Pilidium coppingeri Strebel, Zook Jahrb. Syst., xxv., 1907, p. 110, pk iii., fig. 38 ; Id., 
Schwed. Siidpol. Exped., vi., 1908, p. 83. 
Lepeta antarctica Smith, Nat. Antarct. Exped., ii., 1907, Moll., p. 12, pk ii., fig. 11 ; 
Id., Hedley, Brit. Antarct. Exped., ii., 1911, Moll., p. 3. 
? Patella emarginuloides Philippi, Malak. Blatt., xv., 1868, p. 224. 
A series from Adelie Land ranges from small specimens like the type of L. antarctica 
to one 13mm. long, 6mm. high, and 9-5mm. broad. In the adult, the anterior slope 
is more gradual, the radial sculpture is comparatively weaker and the scales thereon 
disappear. Sometimes the interior is of a bright orange colour. 
Vol. iv., Part 1 —f 
