13 . 109 



Placuna sella, Gmklin, Kncydop. niétliud., pi. 174, figs. 1 et 3 4. 



— — — Martini u. Chemnitz, Conchj'l. Cabin., VII, 1. Abtii., p. (i4, ])l. .i, lig. 1. 



— — — Keeve, Conchol. icon , XVIII, Placuna, Sp. 1. 



_ — — P. Fischer, Catal. d. Moll. de l'Indo-Chine, p. 2(18. 



Placenta Ephippium, Retzius, Diss. sist. nova testaceor. genera, 1788, p. 16. 



"Les grèves du golfe de Siam" (Morlet). " 



The Danish Expedition lo Siam collected no specimens of this species. 

 Distribution: — Singapore, Mergui Archip. — Philippines, China, Java, Blitong 

 (post-lertiary), Celebes, Amboina, Obi Isis., Pelew Isis. 



Fam. Arcidae. 



Area navicularis, Brug. 



Area navicularis, Bruguièiik, Kncyclop. method. Hist, natur. d. vers, I, 1792, p. 90, No. 4. 



— — — Reeve, Conchol. icon., II, Area, Sp. 70. 



— — — Kdg. Smith, Rep. Challenger. Lamellibranchiata, p. 259. 



— — — Kobelt in Martini u. Chemnitz, Conchyl. Cabin, VIII, 2 Abtli., p. öl, pi. 4, 



fig. 7, pi. 14, figs. « — 7. 



— — — MoRi.ET, Journ. de Conchyl., vol. 37, 1889, p. 162. 



— — - E. Lamy, Bulletin du Mus. d'Hist. Nat., Pari.s, 1904, p. 270. 



— — — Pritchard and Gatlii-f, Proceed. Roy. Soc. Victoria, vol.17, I, 1904, p. 240. 



— — - E. Lamy, Journ de Conchyl., vol. 55, 1907, p. 20. 



— subquadrangula, Dunker, Philippi, Abbild, u. Beschreib, neuer od. wenig gekannt. Conchyl., 1847, 



II, p. 210 {Area 10), No. 3, Area, pl. Ill, fig. 3. 



— — — Kobelt in Martini u. Chemnitz, Conchyl. Cabin., VIII, 2 Abth., p. 67, 



pl. 19, figs. 5-6. 



— fusco marginata, — Novität. Conchol., 1858 — 70, p. 136, No. 157, pl. 45, figs. 12-14. 



— — — — Kobelt in Martini u. Chemnitz, Conchyl. Cabin , VIII, 2 Abth., p. 69, 



pl. 20, figs. 1—2. 



var. Unter, Jonas. 



Area Unter, Jonas, Zeitschr. f Malakozool., 1845. p. 172. 



— — — Philipim, Abbild, u. Reschreib, etc., II, p. 209, No. 1, pl. 3, fig. 1. 



— — — Kobelt in Martini u. Chemnitz, Conchyl. Cabin., VIII, 2 Abth., p. 19, pl. 6, figs. 1 -2. 



— — — E. Lamy, Journ. de Conchyl., vol. 55, 1907, p. 20. 



— navicularis. Brug., Philippi, Abbild, u. Beschreib, etc., II, p. 210, No. 2, pl. 3, fig. 2. 



— — — var., Dunker, Index moll. mar. Japon., p. 232, pl. 14, figs. 16—17. 



Very common, many specimens taken between Koli Rin and Koh Kut, 4 — 38 

 fathoms, shells, stones, mud and sand. 



Islands in the Gulf of Siam (L. Morlet). 



Long. 2 — 59 mm. 



Distribution: — Gulf of Manaar, Aden, Suez, Madagascar (Voeltzkow, Lamy), 

 Durban (Edg. Smith). — Poulo Condor, Cochin China, China, Japan, Amboina, 

 Blitong (post-tertiary), Torres Strait, North, East and South Australia, Tahiti, Salo- 

 mon Isis., New Caledonia. 



' Journal de Conchyliologie, 1889, vol. 37, p. 161. 



