61 157 
Koh Kram, 20—30 fathoms (4). Between Koh Mesan and Cape Liant, 9 
fathoms (1). South of Koh Chuen, 30 fathoms, shells (1). Between Koh Mesan 
and Koh Chuen, 25---38 fathoms (1). 
Long. 9—19 mm., alt. 10—23 mm. 
Distribution: — Gulf of Aden (luculentus, Reeve var.), Red Sea. — Sulu 
Archip., North Australia, Bathurst Isl. (north-west coast of Australia), Port Molle 
(Queensland), Cape Capricorn (East Australia), Paumotu Isl. 
Pecten (Vola) Sannionis, Chemn. 
Pallium Sannionis, CHEMNiTz, Conchyl. Cabin., VII, p. 313 (p. p. synonym.), pl. 65, fig. 614. 
Pecten spectabilis, Reeve, Conchol. icon., VIII, 1853, Sp. 128. 
— — — Martini u. Cuemnitz, Conchyl. Cabin., VII, 2 Abth., p. 61, pl. 16, fig. 3. 
— — — Dunker, Index molluscor. mar. Japon., 1882, p. 241, pl. XI, figs. 12—13. 
—  histrionicus, GMELIN var., Perit, Journ. de Conchyl., IV, 1853, p. 150; pl. 5, fig. 2. 
Koh Chuen, 9—38 fathoms, shells (1 + 7/2). Between Koh Kut and Koh Kahdat, 
10 fathoms, shells (*/2). 
Long. 22—30 mm. 
Distribution:— Mauritius (RoBILLARD). — Japan, Nagasaki (LiscHKE, DUNKER). 
CHEMNITz’s original specimen exists in the Zoological Museum of the University 
of Copenhagen; on comparing it with the specimens from the Gulf of Siam,! it 
will be seen that the colouring in the latter is less variegated and conspicuous, but 
the shape and the characteristic hollow ring-sculpture on the ribs are the same. 
I have re-introduced Cuemnirz’s name, hitherto ignored, which has the priority. 
The species P. histrionicus, which was afterwards established by GMELIN, and which 
is moreover badly characterized (REEVeE’s figure and description also scarcely repre- 
sent the species correctly), needs to be more thoroughly investigated on the basis 
of a greater quantity of material than has hitherto been the case. 
Pecten (Chlamys) madreporarum, Petit (Sow.). 
Pecten madreporarum, Prtir, SowERBY, Thesaurus Conch., I, p. 68, pl. 14, fig. 68. 
— — — Reeve, Conchol. icon., VII, Pecten, Sp. 117. 
— _ —  Marrini u. Cuemnirz, Conchyl. Cabin., VII, 2 Abth., p. 131, pl. 36, fig. 6. 
= _— —  P. Fiscuer, Catal. d. Moll. de l’'Indo-Chine, p. 209. 
— _ Sowersy, Cu. Hepiey, Australian Museum, Sydney, Memoir III, 1896—1900, p. 494. 
North end of Koh Chang, 1 fathom, old coral blocks (°*/2). 
Long. 20 mm., alt. 24 mm. 
Distribution: — Singapore, Poulo Condor, Philippines, Java, New Guinea, 
Torres Strait, North-east Australia, Fitzroy Isl., New Caledonia, Funafuti (Ellice Isl.). 
Amussium paucilirata, Smith. 
Amussium paucilirata, Epc. Smrru, The Fauna and Geography of the Maldive and Laccadive Archipelagoes 
II, 1903, p. 622, No. 301, pl. 36, figs. 23—24. 
1 These correspond exactly with DuNnker’s figures in “Index moll. mar. Japon,” loc. cit. 
