133 229 



Chang {' .). Belween Fvoh Chuen and Koh Chang, 15 fathoms, nuul ('2). BeUveen 

 Koh Kahdat and Koh Kiit, 6—10 fathoms, clay mixed with sand (fi). W. of Koh 

 Kilt, 15 fathoms, mud (2). W. of Koh Kut, 30 fathoms, sand and mud ("/:!). S. of 

 Koh Kut, 17-20 fathoms, mud (1). S. of Koh Kahdat, 8—10 fathoms, mud ('/:i). 

 E. of Koh Mak, 20 fathoms, mud (4). W. of Koh Kut, 15 fathoms, mud (1). 



Long. 3— 16 mm. 



Distribution: — Meigui Archip. (E. v. Martens). 



The figure bj' Römer (loc. cit.) is not good, flierefore I have figured some of 

 the specimens from the Gulf of Siam. E. v. Martens was the first (1<S87) to give 

 a locality for this species. C. chordata, Römer, is perhaps the same species. 



Cytherea (Caryatis) Yerburyi, Smith. 



Cytherea {Caryatis) Yerburyi, Edg. Smith, Proc. Zool. Soe. London, 1891, p. 423, No. 192. 

 Dione erubescens, Reeve non Diinker\ Conchol. icon., XIV, 18fi3, Dione, Sp. 54. 



Koh Kahdat, 1 — 5 fathoms, sand (1). W. of Koh Kut, 15 fathoms, mud (1). 

 W. of Koh Kut, 30 fathoms, sand and mud (^/a). 



Long. 10 — 14 mm. 



Distribution: — Ceylon (Reeve), Aden (Brit. Mus.). — Japan (Brit. Mus.), 

 Queensland (Brazier). 



The specimens from the Gulf of Siam are covered with a very thin, viscous 

 epidermis, to which grains of sand, etc. are found attached. 



Cytherea (Caryatis) Deshayesi, Pfr. 



Cylberca Deshayesi, Pfeiffek, Mahtim u. Chemnitz, Concliyl. Cabin., XI Bd., 1 Abtli.. 1869, p. 74, No. 57, 



pi. 30, fig. 9. 

 Uiunc crocca. Deshayes, Proc. Zool. Soc. London, 1853, p. 2, No. 5. — Catal. Concliif. Brit. Mus., I, 1853, 

 p. (i6, No. 34 mon Cytb. crocea, Gray). 

 - - — Reeve, Concliol. icon., XIV, 1864, Dione, Sp. 53. 



Caryatis crocea, Deshayes, Römer, Monographie d. Molluskengatt. Venus, I, p. 99, No. 23. p. 27, fig. 1. 



Specimens from Suracha, Siam (J. H. Ponsonby), are to be found in the British 

 Museum under the name of Callocardia Deshayesi, Pfr. var. 



Distribution: — Singapore (Miss Archer, Brit. Mus.). — Philippines. 



Cytherea (Caryatis) isocardia, Sow. 



Cytherea {Caryatis) isocardia, Sowerby, Proc. Zool. Soc. London, 1888, p. 213. 



— — — Edg. Smith, Proc. Malacol. Soc. London, IV, p. 81. 



Callocardia guttata, A. Adams, Annals & Magaz. Nat. Hist., Ser. 3, 1864, XIU, p. 3(17 (non Callisla guttata, 



RÖMElO. 



— — — Edg.S.mith, Rep. of the Lamellibranchiata of the Challenger Exped., p. 156. 



W. of Koh Kut, 15 fathoms, mud (^/j). 



Long. 26 mm., alt. 22 mm., crass. 20 mm. 



Distribution: — Isl. af Quelpart, south of the Korea (Adams). 



Though the shell which I have before me, from the Gulf of Siam, differs 

 somewhat in form from C. isocardia, Sow., I can scarcely be wrong in referring it 

 to this species. 



