KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. wn:o (6. vis 
posterior valve has a greater length, in relation to its breadth, than the figures show, 
its sutural plates are not produced so far laterally but are more dilated forwards 
and evenly rounded. 
The colour of the present species is very variable from grayish to brownish, 
usually marbled in red and green and maculated with white. In one specimen the 
girdle is light green with red dots on the margin and a couple of darker green 
blotches at each end, in other specimens it is light reddish brown with purple stripes 
or flesh-coloured, minutely dotted with dark brown. Other specimens have the girdle 
grayish, minutely punctated with brown and maculated with green clouds. The 
valves, too, are variegated of gray, green, white, and reddish, forming stripes, points, 
or blotches, in various patterns. Inside, the valves are rose-tinted or white. The 
girdle is of a leathery consistency and bears a fringe of very short spicules on its 
edge, its under-side is yellowish white, dotted and clouded with brown, especially at 
the fore end, where it is broader. The gills attain only half the length of the foot. 
The species was first recorded from the Philippines, 9 fms (Pi~spry 1893), and 
has afterwards been found in Ceylon, 5—13 fms, in the Maledives and Laccadives, 1—33 
fms (KE. Smita 1903, including C. tetricus), and in the Zanzibar Channel, 5—20 fms 
(SyKEs 1907). 
3. Mollusca from the shores of Queensland. 
Placuna placenta Linné. Cairns, in mud on the shore, 1 sh., max. diam. 
(breadth) 115 mm. 
Chione peronii Lamarck. Yarrabah (May 1913), 5 sps, max. ]. 32 mm. 
Natica (Mamma) plumbea Lamarck. Yarrabah (May 1913), 1 sp., h. 34 mm. 
