282 186 



Gastrochœna lageniila, Lamarck, Sowerby in Reeve, Conchol. icon., vol. 20, Gastrocbœna, Sp. 18, pi 3, 



fig. 16 (not fig. 18 = G. ouata, Sow.).' 



— pupina. Deshaves, Proc. Zool. Soc. London, XXII, 1854, p. 326, No. 39. 



— — — Sowerby, Thesaur. Conchyl., V, 1887, p. 130, No. 25, pi. 470, fig. 16. 



— — — — in Reeve, Conchol. icon., vol. 20, Gastrochœna, Sp. 17. 

 Gastrocliaena destiayesi, Sturanv, Lamellibranchiateii d. Rothen Meeres, 1899, p. 19, pi. 5, figs. 1 — 7. 



NW. of Koh si Chang, 10 fathoms, mud (4). Between Koh Mesan and Cape 

 Liant, 5 — 9 fathoms (6). Between Koh Mesan and Koh Chuen, 25 — 38 fathoms (4). 

 S. of Koh Chuen, 30 fathoms, shells (1). W. of Koh Chang, 20 fathoms, mud (1). 

 E. of Koh Mak, 20 fathoms, mud (3). W. of Koh Kut, 15 fathoms, mud (3). Coast 

 of Koh Kut (1). 



Long. 12 mm. 



Distrihution: — Coromandel Coast, Ceylon, Red Sea, Suez. — Hong Kong, 

 Moreton Bay. 



Gastrochaena aequabilis, Sluiter,' from Krakatau is closely allied to the present 

 species. As Spengler's original specimens of G. cymbiuin have been at my disposal 

 I am certain of the correctness of the determination. 



Fam. Pholadidae. 



Pholas (Monothyra) orientalis, Gm. 



Pbolas orientalis, Gmelin, Systema Naturae, ed. XIII, 1790, p. 3216, No. 7. 



— — — Lamarck, Hist. nat. d. anim. s. vert, V, 1818, p. 444, No. 2. — éd. 2, VI, p. 44, 



No. 2. 

 Dactglina — — Gray, Ann. & Mag of Nat. Hist., 2 ser., VIII, 1851, p. 382. 



Pilotas Orieiitalis, — Sowerby, Thesaur. Conchyl., II, p. 486, No. 4, pi. 102, figs. 3-4. 

 Monotliyra orientalis, ÜxMelin, Thyon, Proc. Acad. Nat. Sc. Philadelphia, 1862, p. 205. — Catalogue of rec. 



Moll. Plioladacea, p. 3. 

 Pilotas — — Reeve, Conchol. icon., XVIII, Pholas, Sp. 5. 



Phragmopholas orienlalis, Gmelin, Morlet, Journ. de Conchyl., vol.37, 1889, p. 173, No. 91. 

 Pholas {Dactylina) — — Clessin in Martini u. Chemnitz, Conchyl. Cabin., XI Bd , 4 Abth., 



p. 12, No. 6, pL2, figs. 3-4. 



— Indiae Orientalis, Chemnitz, Conchyl. Cabin., VIII, 1785, p. 35G, pi. 101, fig. 860. 



' On PI. 3 in "Conchologia iconica" the numbers of No. 16 (G. ovata from Panama) and No. 18 

 (G. lagenula from Ceylonl, have been interchanged bj' a misprint; this has misled Sturany (who did 

 not discover the error), so that he (loc. cit.) has established his species G. Deshayesi upon typical 

 specimens of G. cgmbium, Sp. {lagenula. Lam.). It is not surprising that Clkssin should copy this 

 error in his Monograph, without comparing the diagnoses with the figures, when we recall the uncritical 

 character of his Monographs of Bivalves in: Martini u. Chemnitz, Conchyl. Cabinet. Hedi.ey (Australian 

 Museum, Sydney. Memoirs III, 1896—1900, p. 508) characterizes Clessin's Monograph of "The Teredinidœ" 

 as follows: "Even worse is an alleged Monograph bj' Clessin in the Conchylien Cabinet, of which the 

 te.\t and illustrations disgrace that serial. The latter memoir is absolutely the worst zoological mono- 

 graph I have read." 



-' C. P. Sluiter, lieber d. Bildung d. Kalkröhren von Gastrochaena. Natuurk. Tijd.schrift v. Nederl. 

 Indie, 50 Bd., 1890, pp. 45-60, pi. 1. 



