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.), pi. (i5, fig. «14. 

 Pecten spectalnlis, Reeve, Conchol. icon., VIII, 1853, Sp. 128. 



— — — Martini u. Chemnitz, Conchyl. Cabin., VII, 2 Abth., p. 61, pi. l(i, fig. 3. 



— — — Dunker, Index molluscor. mar. Japon., 188'i, p. 241, pi. XI, figs. 12 — 13. 



— histrionicus, Gmelin var., Petit, Journ.de Conchyl., IV, 1853, p. 150; pi. 5, fig. 2. 



Koh Chuen, 9—38 fathoms, shells (1 + -'2). Between Koh Kut and Koh Kahdal, 

 10 fathoms, shells (^/s). 



Long. 22—30 mm. 



Distribution: — Mauritius (Rohillaud). — 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 Chemnitz's name, hitherto ignored, which has the priority. 

 The species P. histrionicus, which was afterwards established by Gmelin, and which 

 is moreover badly characterized (Reeve'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.). 



Perlen niadieporarnnt, Petit, Sowerby, Thesaurus Conch., I, p. 68, pi. 14, fig. 68. 



— — — Reeve, Conchol. icon., VIII, Pecten, Sp. 117. 



— — — Martini u. Chemnitz, Conchyl. Cabin., VII, 2 Abth., p. 131, pi. :i(i, fig. 6. 



— — — P. Fischer, Catal. d. Moll, de I'lndo-Chine, p. 209. 



— — Sov*'ERBV, Ch. Hedi.ev, Australian Museum, Sydney, Memoir III, 18Ü6 — l'.)U(), p. 4!)4. 



North end of Koh Chang, 1 fathom, old coral blocks (^/a). 

 Long. 20 mm., alt. 24 mm. 



Distribution:— Singapore, Poulo Condor, Philippines, Java, New Guinea, 

 Torres Strait, North-east Australia, Fitzroy Isl., New Caledonia, Funafuti (EUice Isl.). 



Amussium paucilirata, Smith. 



Amussinin paucilirata, Eog. Smith, The Fauna and (jeography of the Maldive and Laccadive Archipelagoes 

 II, 1903, p. 622, No. 301, pi. 36, figs. 23— 24. 



' These correspond exactly with Dunker's figures in "Index moll. mar. Japon," loc. cit. 



