57 153 



the Red Sea (Sturanv, Pagenstecher, and others), Suez (Vaillant), Mauritius 

 (v. Martens), Mozambique (Peters), Querimba Isl. (v. Martens), Pouio Condor? 

 (RocHEBRUNE, P. reniformis, Lam.), Ciiina (Mitchell), Lord Hood's Isl. (Sowerby), 

 and also from the east coast of North, Central, and South America, from Cape 

 Hatteras to Patagonia (d'Orbigny, Morch, Krebs, Sowerby, Adams, Pagenstecher, 

 Dall, Edg. Smith, Beau, and others). — It will doubtless be proved later, that 

 several of the species closely allied to P. imbricata, Mke., are synonymous with it, e. g. 

 P.depressa, Lam. (from Singapore and Mergui Isl., v. Martens'), P. Nouae Zelandiae, 

 Sow. (New Zealand), P. Essinglonensis, Sow. (Port Essington), P. Philippinarum, Hani. 

 (Philippines, Sowerby; Red Sea, Cooke; Hong-kong, Frauenfeld). P. Ceylanica, 

 Sow. (Ceylon), P. Australis, Lam.'- (Philippines, Hanley; Australia, Lamarck, Hedley), 

 P. horrida, Dunk. (Japan and China, Dunker), P. aculeata, Sow., and others. — 

 Among the specimens from the Gulf of Siam several individuals occur, which 

 agree both with the figure given by Reeve (PI. 1, Fig. 4c) and that by Sowerby 

 (PI. 90, Fig. 6), they bear a very close resemblance to corresponding individuals of 

 P. spondyloidea, Meuscli., from St. Thomas. 



Fam. Pectinidae. 



Pecten pyxidatus, Born. 



Ostrea pyxidata, Born, Testaeea Musei Cæsarei Viiulobon., 1780, p. 108, pi. 6, figs. 5 — G. 

 Pecten pfixidatus, — Reeve, Conchol. icon., VIII, Pecten, Sp. 96. 



— — — Martini u. Chemnitz, Concliyl. Cabin., VII, 2 Abth., p. 57, pi. 15, figs. 5— fi; pi. 35, 



figs. 1-2. 



— — — Fischer, Catalogue d. Moll, de I'ludo-Chine, p. 209. 



— crehricostdltis. Philippi, Abbild, u. Beschreib, neuer od. wen. gekannt. Conchylien, I, p. 100 2), pl. 1, 



fig. 2. 



Common from Koh Lan to Koh Kut, 6 — 30 fathoms, mud and clay. 



Gulf of Siani, west coast of Cambodja (Crosse & Fischer). 



Long. 8—36 mm. 



Distribution: — Singapore (2 — 3 fathoms, coral reef. Dr. Mortensen), Mergui 

 Arehip., Andamans, Tranquebar, Gulf of Manaar, Persian Gulf, Gulf of Oman. — 

 Annam, China, Philippines. 



Pecten senatorius, Chemn. (Gmel.). 



Pallium scnutoris, Chemnitz, Conchyl. Cabin., VII, p. 320, pi. 65, fig. 617. 

 Ostrea senatoria, Gmei.in, Syst. Nat., ed. XIII, 1700, p. 3327, No. 61. 

 Pecten senatorius, — Reeve, Conchol, icon., VIII, Pecten, Sp. 81. 



■ — — — Martini u. Chemnitz, Conchyl. Cabin., VII, 2 Abth., pp. 63 and 83, pi. 16, fig. 7; 



pi. 21, fig. 4. 



— — — Edc. a. Smith, Challenger Report, Laniellibranchiata, 1885, p. 300. 



' LiENARD records it from Mauritius, but v. Martens considers it (in: Mollusken d. Maskarencn u. 

 Seychellen, p. 137) to be "wahrscheinlich amerikanisch." 



- non P. Anstralis, Krauss ifroin Natal) -^ muttijilicata, Desli. 

 D.K. 1). Vidensk. Selsk. Skr, •;. K:uUki-, n;iliirvidensk.iig math AM V. 3. 20 



f 



V 



