177 273 



H. & A. Adams, ' Tryon, - P.Fischer,' and others), the erroneous statement that the 

 characteristic cardinal tooth occurs in the right valve, while, in reality (as correctly 

 stated by Turton, ' Forbes & Hanley, "' Edg. Smith, " and others), it is found in the 

 left valve. 



Sphenia perversa, Blanf. 



Sphenia perversa, Bi.anpord, Journ. of the Asiatic Society of Bengal, vol. 36, p. 11, 1867, p. 68, pi. 3, 



figs. 4 — 6. 

 — — — Edg. Smith, Annals and Magaz. Nat. Hist., vol. 12, 6 Ser., 1893, p. 279, No. 6, 



pi. 15 A, fig. 6. 



Between Koh Mesan and Koh Chuen, 25 — 38 fathoms, stones and shells (1). 

 Koh Chuen, 10 — 15 fathoms (1). Between Koh Mesan and Cape Liant, 5 — 9 

 fathoms ('/s). Coast of Lem Ngob, low tide (4). Koh Chang, low tide (1). North 

 end of Koh Chang, 1 — 12 fathoms, old coral blocks (12). Gulf at the south end of 

 Koh Chang (6). North of Koh Kahdat, 4 — 5 fathoms, coarse sand (1). Koh Kahdat, 

 1 — 2 fathoms, corals (1). 



Long 2 — 11 mm. 



Distribution:— Delta of the Irawady, Pegu. 



Like all Mollusca that live in holes and tunnels, which they themselves have 

 made or which were made in other ways, S. perversa, Blanf., varies greatly in form 

 according to the locality which it inhabits; I think it will scarcely be possible to 

 maintain Edg. Smith's species S. inaequalis from Singapore; I have specimens of S. 

 perversa Blanf., before me with Hat left valves and which otherwise almost com- 

 pletely agree with Smith's figure and description of S. inaequalis, but the flat left 

 valve is certainly an individual character only. 



Cryptomya elliptica, A. Ad. 



Sphænia elliptica, A. Adams, Proc. Zool. Soc. London, XVUl, 1850, p. 88. 

 Cryptoimiu - — Annals & Mag. Nat. Hist., 1868, p. 366. 



— — — Angas, Proc. Zool. Soc. London, 1871, p. 99. 



— — — Dunker, Index moll. mar. Japonici, 1882, p. 178, pi. 7, figs. 17— 19. 



— truncata, Gould, Otia Conchol., p. 163. 



Koh Kahdat (Va). S. of Koh Kahdat, 8—10 fathoms, mud (Va). N. of Koh 

 Kut, 10 fathoms, mud (2 + V2). W. of Koh Kul, 15 fathoms, mud ('72). 

 Long. 4—12-5 mm. 

 Distribution. — Japan, Sydney. 



1 The Genera of recent Mollusca, 11, 1858, p. 357. 



'■' Structural and systematic Conchology, III, 1884, p. 140. 



3 Manuel de Conchyliologie, 1887, p. 1122. 



* Conchylia insul. Britannicarum, 1822, p. 36. 



^ A history of British Mollusca, I, 1853, p. 192. 



'' loc. cit. p. 279. 



D. K n. Vlilensk Selsk. SUr.. 7. Rakke, nnlurvidciisU. oi; niiilhem. Afd. V. 3. 35 



