19 115 



Long. 24 mm., alt. 14 mm., crass. 10 mm. 



Between Koh Rin and CI i tV Rock, 15 fathoms ('/a). Koh Kiam, 3Ü fathoms (Vs). 

 Gulf of Koh Chang, 3—5 fathoms, soft clay (^/a). Between Koh Kut and Koh Kahdat, 

 10 fathoms, shells (-'/a). 



This characteristic species is nearest related to A. obliqiiata. Gray, and A. 

 decussata, Lischke, but may easily be distinguished from these forms. 



Area (Fossularca) pectunculiformis, Dunk. 



Barbalia pectunculiformis. Dunker, Novitates conchologicae, 18()6, p. 88, pi. 28, figs. 4 — (i. 

 Area (liurbatia pectunculiformis, Dunker, Martini u. Chemnitz, Conchyl. Cabin., VIII, 2 Abtli., p. 125, 



pi. 32, fig.s. 5— 6. 



— (Noetia) — — I.amy, Journ. de Conchyl., vol. 55, 1907, p. 300. 



W. of Koh Chuen, soft clay and mud ('^/a). S. of Koh Samit, 20 fathoms, 

 mud (^/a). Gulf of Koh Chang, 5 fathoms, soft clay (^/j). Strand of Koh Kahdat 

 (»Wa). S. of Koh Kahdat, 8—10 fathoms, mud {^h). Between Koh Kahdat and Koh 

 Kut, 6 fathoms, clay mixed with sand (^^/s). S. of Koh Kut, 17—20 fathoms, mud ('/a). 

 W. of Koh Kut, 15 fathoms, mud (^/a). W. of Koh Kong (1). 



Long. 3 — 10 mm. 



Distribution: — Karikal (Coromandel Coast, subfossil, Dautzenberg), Borneo 

 (Dunker), Surabaja (Java, Ed. v. Martens). ' 



Ana olivacea, Reeve, is very closely related to this species. Can some of the 

 recorded occurrences of A. lactea L. in Asiatic and Australian waters, be due to 

 erroneous determination of A. pectunculiformis, Dunk.? 



Area (Fossularca) sculptilis, Reeve. 



Area sculptilis, Ri;i:vi;, Proc. Zool. Soc. I^ondon, 1844, p. 128. — Conchol. icon., 11, 1844, Area, .Sp. 118. 



— {Barhatia) sculptilis, Reeve, Edg. Smith. Rep. Lamellibranchiata of the Challenger Exped., p. 262. 



— (Acar) — — KoBELT in Martini u. Chemnitz, Concliyl. Cabin., Vlll, 2 Abth , p. 193, 



No. 175, pi. 46, tig. 14. 



Common between Koh Lan and Koh Mak, many specimens in 1 — 38 fathoms, 

 sand, mud, gravel and shells. 



Long. 2—13 mm. 



Distribution: — Bombay (Mf:lvill & Abercrombie, A. Zebuensis, Reeve), 

 Karachi (Melvill & Standen). — Amboina (Challenger), Philippines (Reeve), Torres 

 Strait. (Melvill & Standen). 



Lamy (Journ. de Conchyl., vol. 55, 1907, p. 100) identifies A. sculptilis, Reeve, 

 with A. afra, Gmel. var. solida, Sow. I do not think that he is correct in so 

 doing. Apart from other considerations the ditTering geographical distributions 

 of A. afra, Gmel. (= A. pisolina, Lam.), A. solida, Sow., and A. sculptilis, Reeve, are 

 at once conspicuous; besides, it seems to me that A. sculptilis may very well be 



' As communicated by letter. 



15* 



