57 153 
the Red Sea (Sturany, PAGENSTECHER, and others), Suez (VariLuant), Mauritius 
(v. Martens), Mozambique (PETERS), Querimba Isl. (v. MARTENS), Poulo Condor? 
(ROCHEBRUNE, P. reniformis, Lam.), China (MircHELL), Lord Hood’s Isl. (Sowerby), 
and also from the east coast of North, Central, and South America, from Cape 
Hatteras to Patagonia (D’OrBIGNY, Morcu, Kress, SowEerBy, ADAMS, PAGENSTECHER, 
Dati, Eve. Smirn, Brau, 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. Marrens'), P. Novae Zelandiae, 
Sow. (New Zealand), P. Essingtonensis, Sow. (Port Essington), P. Philippinarum, Hanl. 
(Philippines, Sowrersy; 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 (Pl. 1, Fig. 4c) and that by Sowerny 
(Pl. 90, Fig. 6), they bear a very close resemblance to corresponding individuals of 
P. spondyloidea, Meusch., from St. Thomas. 
Fam. Pectinidae. 
Pecten pyxidatus, Born. 
Ostrea pyxidata, Born, Testacea Musei Cesarei Vindobon., 1780, p. 108, pl. 6, figs. 5—6. 
Pecten pyxidatus, — Reeve, Conchol. icon., VII, Pecten, Sp. 96. 
— —- Martini u. CHEMNITZ, Conchyl. Cabin., VII, 2 Abth., p. 57, pl. 15, figs. 5—6; pl. 35, 
figs. 1—2. 
— — —  Fiscuer, Catalogue d. Moll. de ?Indo-Chine, p. 209. 
—  erebricostatus, Puitippt, 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 Siam, west coast of Cambodja (Crossrt & FiscHeEr). 
Long. 8—36 mm. 
Distribution:— Singapore (2—3 fathoms, coral reef, Dr. MorTENSEN), Mergui 
Archip., Andamans, Tranquebar, Gulf of Manaar, Persian Gulf, Gulf of Oman. — 
Annam, China, Philippines. 
Pecten senatorius, Chemn. (Gmel.). 
Pallium senatoris, CHEMNitz, Conchyl. Cabin., VII, p. 320, pl. 65, fig. 617. 
Ostrea senatoria, GMeLin, Syst. Nat., ed. XII, 1790, p. 3327, No. 61. 
Pecten senatorius, — REEVE, Conchol. icon., VIII, Pecten, Sp. 81. 
— = — Marrini u. CHEMNITZ, Conchyl. Cabin., VII, 2 Abth., pp. 63 and 83, pl. 16, fi 
pl. 21, fig. 4. 
= = — Epa. A. SmirH, Challenger Report, Lamellibranchiata, 1885, p. 300. 
ore 
1 Lrenarp records it from Mauritius, but v. Marrens considers it (in: Mollusken d. Maskarenen u. 
Seychellen, p. 137) to be “wahrscheinlich amerikanisch.” 
2 non P. Australis, Krauss (from Natal) — multiplicata, Desh. 
D. K. D, Vidensk. Selsk. Skr., 7. Reekke, naturvidensk. og math, Afd. V. 3 20 
