31 127 



does not represent Area indica, Gm., more probably it is A. campechensis, Gm. 

 (= A. amerkana. Gray). Lamarck has also, undoubtedly, been mistaken with 

 regard to A. indica, Gm. when, in his diagnosis, he says "testa ovata" and later on 

 "costiis mediis sulco divisis." Ed. v. Mahtkns also supposes (as he writes in a 

 letter to me) that Lamarck has fallen into the same error as Reeve, and has had, 

 lor examination, a specimen of A. campechensis, Gm. 



Area (Trisidos) tortuosa, L. 



Area torlnosa, Linnk, Systema Naturæ, ed. X, 1758, p. 693, No. 139. — etl. XII, p. 1140, No. 1G8. - ed. 

 XIII, p. 3305, No. 1; — Mus. Ludov. Ulr., p. 517, No. 89. 



— — — Lamaih-.k, Anim. s. vert., éd. 2, VI, p. 460, No. 1. 



— — — Reeve, Conchol. icon., II, Area, Sp, 86. 



— — — Martini u. Chemnitz, Conchyl. Cabin., VIII, 2 Abth., p. 7, pi. 1, figs. 1—2. 



— — — Crosse et Fischer, Journ. de Concliyl., vol. 37, 1889, p. 2D1. 

 I'nnillelipedutn tortnosum, Linné, Morlet, Journ. de Conchyl., vol.37, 1889, p. 163. 

 Area I'antllelepipediim tortuosa, Linné, Lamv, Journ. de Conchyl., vol.55. 1907, p. 108. 



— lorla, Steknstiui', Mduch, Catal. conchyl. quæ reliq. C. V. Kierulf, 1850, p. 33. — Catal. concljyi. 



qua- reliq. Yoldi, II, 1853, p. 40. 



NW. of Koh Chang, 10 fathoms, mud (1). Koh Lan, 30 fathoms, mud (1). 

 W. of Koh Kut, 15 fathoms, mud ('/a). Between Koh Kahdat and Koh Kut, G — 10 

 fathoms, clay mixed with sand, shells (1 -j- ^/s). 



Islands in the Gulf of Siam (Morlet). 



Long. 10—28 mm. 



Distribution: — Malacca, Singapore, Madras, Gulf of Manaar, Bombay, 

 Karachi, Persian Gulf, Gulf of Aden, Zanzibar. — Poulo Condor, Annam, China, 

 Philippines, Bani^a-Strait, Moluccas, North-west Australia, Port Curtis (East Australia). 



Ed. Smith' is justified in rejecting Klein's name for the subgenus Parall- 

 elepipedum, as it dates from 1753; but he should use Bolten's name Trisidos, dating 

 from 1798, and should not employ, as he does, Oken's name Trisis, dating from 1815. 



Area (Trisidos) semitorta, Lam. 



Area semi-torta, Lamarck, Anim. sans vert., éd. 2, VI, 1835, p. 460. 



— semitorta, — Reeve, Conchol. icon., II, Area, Sp. 89. 



— (Parallelepipeclum) semitorta, Lamarck, Martini u. Chemnitz, Conchyl. Cabin., VIII, 2 Abth., p. 134, 



pi. 35, figs. 1—2. 



— (Triais) semitorta, Lamaiick, Eno. A. Smith, Report Challenger Lamellibr., p. 268. 



— [Parulletipipcilum) semitorta, Lamarck, Crosse et F'ischer, Journ. de Conchyl., vol. 40, 1892, p. 70. 



— — — — Lamv, Journ. de Conchyl., vol. 55, 1907, p. 109. 



Common between Koh Rin and Koh Kut, 1 — 38 fathoms, mud, sand and shells. 

 The Gulf of Siam on the west coast of Cambodge (Crosse & Fischer). 

 Long. 4 83 mn\. 



' Report on the Lamellibranchiata of the Challenger-Expedition, p. 268. 



