133 229 
Chang (‘/2). Between Koh Chuen and Koh Chang, 15 fathoms, mud ('/2). Between 
Koh Kahdat and Koh Kut, 6—10 fathoms, clay mixed with sand (6). W. of Koh 
Kut, 15 fathoms, mud (2). W. of Koh Kut, 30 fathoms, sand and mud ("/2). S. of 
Koh Kut, 17—20 fathoms, mud (1). S. of Koh Kahdat, 8—10 fathoms, mud ('/2). 
E. of Koh Mak, 20 fathoms, mud (4). W. of Koh Kut, 15 fathoms, mud (1). 
Long. 3— 16 mm. 
Distribution: — Mergui Archip. (E. v. MARTENS). 
The figure by R6mer (loc. cit.) is not good, therefore I have figured some of 
the specimens from the Gulf of Siam. E. v. Martens was the first (1887) to give 
a locality for this species. C.chordata, Romer, is perhaps the same species. 
Cytherea (Caryatis) Yerburyi, Smith. 
Cytherea (Caryatis) Yerburyi, Evc. Smiru, Proc. Zool. Soc. London, 1891, p. 423, No, 192. 
Dione erubescens, REEVE (non DuNKER), Conchol. icon., XIV, 1863, 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 (°*/2). 
Long. 10—14 mm. 
Distribution: — Ceylon (REEvE), Aden (Brit. Mus.). — Japan (Brit. Mus.), 
Queensland (BRAZzIER). 
The specimens from the Gulf of Siam are covered with a very thin, viscous 
epidermis, to which grains of sand, ete. are found attached. 
Cytherea (Caryatis) Deshayesi, Pfr. 
Cytherea Deshayesi, PreirrER, MARTINI u. Cuemnirz, Conchyl. Cabin., XI Bd., 1 Abth., 1869, p. 74, No. Dis 
pl. 30, fig. 9. 
Dione crocea, DesHAyYES, Proc. Zool. Soc. London, 1853, p. 2, No. 5. — Catal. Conchif. Brit. Mus., I, 18538, 
p. 66, No. 84 (non Cyth. crocea, Gray). 
— — Reeve, Conchol. icon., XIV, 1864, Dione, Sp. 53. 
Caryalis crocea, DesHayes, ROmeR, Monographie d. Molluskengatt. Venus, I, p. 99, No. 23, p. 27, fig. 1. 
Specimens from Suracha, Siam (J. H. Ponsonsy), 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, Sowersy, Proc. Zool. Soc. London, 1888, p. 213. 
- — — — Epc. Smiru, Proc. Malacol. Soc. London, IV, p. 81. 
Callocardia guttata, A. ApamMs, Annals & Magaz. Nat. Hist., Ser. 3, 1864, XIII, p. 307 (non Callista gultata, 
ROMER). 
= = Epa. Smiru, Rep. of the Lamellibranchiata of the Challenger Exped., p. 156. 
W. of Koh Kut, 15 fathoms, mud (+/2). 
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. 
