228 132 



Between Koh Mesan and Koli Chuen, 25—38 fathoms, stones and stiells ('/a). 

 S. of Koh Chuen, 30 fathoms, shells ('/a). Koh Mak, sandy coast ('/s). S. of Koh 

 Mak, 5 — 6 fathoms (^/s). N. of Koh Kahdat, 4—5 fathoms, sand (1). Koh Kahdat, 

 1 fathom, sand (-/a). 



Long. 8 — 34 mm. 



Distrihution: — Nicobars, Andamans, Ceylon, Mauritius, Reunion, Rodriguez. 

 — Philippines, Japan, Moluccas, Torres Strait, Mast Head Reef (Queensland), Port 

 Curtis (Australia), Lifu. 



Cytherea (Caryatis) striata, Gray. 



Chione striata, Gray, The Analyst, VIII, 1838, p. :i06. 



Cytherica citrina (non Lamarck), Sowerby, Thesaurus Conchyl., II, p. 63(i, pi. 13"2, figs. 117 — 18. 



Dione striata, Gray*, Reeve, Conchol. icon., XIV, Dione, Sp. 44. 



Cytlterca {Canjatis) citrina, Römer, Monogr. d. Molluskengatt. Venus, I, p. 100, pi. 27, fig. 2. 



Callisia citrina, Rochebrune, Bull, de la Soc. Philomat. dc Paris 1881, (Reprint, p. 15, No. 48|. 



Mcretrix {Pitar) citrina, FrscHER, Catalogue d. Moll, de I'lndo-Chine, p. 233. 



North coast of Koh Chang ('/2). 



Long. 36 mm. 



Distribution: — Poulo Condor, Philippines, Formosa, Sulu Isis., Kei Bandan, 

 Jobi Isl. (Geehvinck Bay). 



C. striata. Gray, has always been referred to C. citrina, Lam., but sufficient 

 proof that it is not that species appears to me to be given by Lamarck's diagnosis 

 ("testa cordata-trigona") and by Delessert's figure (PI. 8, Fig. 8) of Lamarck's original 

 specimen. Hidalgo' has arrived at the same conclusion with regard to the speci- 

 mens from the Philippines. H anle y's C. s/ria/a, Gray? ^ from the "River Gambia" is 

 not Gray's species of that name, but is identical ^vith C. citrina, Lam. The indi- 

 vidual from the Gulf of Siam which I have before me exactly agrees with Romer's 

 description and figure (loc. cit.) of C. citrina (^ C. striata, Gray). The true C. citrina, 

 Lam., occurs around Australia, and is easily distinguished from striata by its more 

 triangular form and by its posterior end being considerably more pointed as com- 

 pared with the more truncated form of striata. 



Cytherea (Caryatis) minuta, Koch. 



(PI. IV, Figs. 2.'')- 27). 



Cytljcrea minuta, Koch, Philippi, Abbild, u. Beschreib, neuer od. wenig gekannt. Conchylieu , I, 1845, 

 p. 22 (200), Cytherea, pl. 3, fig. 8. 

 — {Caryatis) minuta, Koch, Römer, Monogr. d. Molluskengatt. Venus, I, p, 124, pl. 33, fig. 1. 

 Dions minuta, Koch, Deshayes, Catalogue of the Conchifera in Brit. iMus., I, p. 73, No. 58. 



Koh Kram, 30 fathoms (1). Koh Chuen, 10—15 fathoms (•■/a). W. of Koh 

 Chuen, soft clay and mud (*»/:i). W. of Koh Chang, 30 fathoms (»/a). W. of Koh 

 Chang, 20 fathoms, mud (3). The strand off the mangrove at the station on Koh 



' Obras malacolôgicas, I, Tom. 2, 1003, p. 198. 



- Sowerby, Thesaurus Conchyl., I. p. (i37, pl. 132, tig. 113. 



