177 273 
H. & A. Apams,'! 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 Turron,* Forpes & Hanvey,® Ene. Smitu,° and others), it is found in the 
left valve. 
Sphenia perversa, Blanf. 
Sphenia perversa, BLANFoRD, Journ. of the Asiatic Society of Bengal, vol. 36, p. II, 1867, p. 68, pl. 3, 
figs. 4—6. 
— _— — oho. Smiru, Annals and Magaz. Nat. Hist., vol. 12, 6 Ser., 1893, p. 279, No. 6, 
pl. 15 A, fig. 6. 
Between Koh Mesan and Koh Chuen, 25—388 fathoms, stones and shells (1). 
Koh Chuen, 10—15 fathoms (1). Between Koh Mesan and Cape Liant, 5—9 
fathoms (‘/2). 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 Epa. Smirn’s species S. inaequalis from Singapore; I have specimens of S. 
perversa Blanf., before me with flat left valves and which otherwise almost com- 
pletely agree with Smirn’s figure and description of S. inaequalis, but the flat left 
valve is certainly an individual character only. 
Cryptomya elliptica, A. Ad. 
Sphenia elliptica, A. Apams, Proc. Zool. Soc. London, XVIII, 1850, p. 88. 
Cryptomya — Annals & Mag. Nat. Hist., 1868, p. 366. 
Angas, Proc. Zool. Soc. London, 1871, p. 99. 
— — _ Dunker, Index moll. mar. Japonici, 1882, p. 178, pl. 7, figs. 17—19. 
a truncata, GouLp, Otia Conchol., p. 163. 
Koh Kahdat (‘/2). S. of Koh Kahdat, 8—10 fathoms, mud (*/2). N. of Koh 
Kut, 10 fathoms, mud (2 + 4/2). W. of Koh Kut, 15 fathoms, mud (°/2). 
Long. 4—12°5 mm. 
Distribution:— Japan, Sydney. 
1 The Genera of recent Mollusca, II, 1858, p. 357. 
* Structural and systematic Conchology, III, 1884, p. 140. 
5’ Manuel de Conchyliologie, 1887, p. 1122. 
* Conchylia insul. Britannicarum, 1822, p. 36. 
5 A history of British Mollusca, I, 1853, p. 192. 
8 loc. cit. p. 279. 
D. K. D. Vidensk. Selsk. Skr., 7. Reekke, naturvidensk. og mathem. Afd. V. 3. 35 
