218 122 



West of Koh Kut, 30 fathoms, sand and mud (Va). 



Long. 6 mm., alt. 8 mm. 



Distribution:— Philippines (Cuming), Sumatra (Mahtin, Deshayes). 



Fam. Mesodesmatidae. 



Mesodesma (Atactodea') glabrata, Lam. 



Crassatella glabrata, Lamarck, Annales du Mus. d'Hist. Nat., VI, 1805, p. 408 (nomen). 



— - — Hist. nat. d. anim. s. vert., V, 1818, p. 482, No. 5. — éd. 2, VI, p. Ill, No. 5. 

 Mesodesma — Deshayes, Hist. nat. d. anira. s. vert., éd. 2, VI, p. 133, No. 2. 



— — Lamarck, Savigny, Descrlpt. de l'Egypte. Mollusques, pi. 8, fig. 5. 

 Papliia — Gmei.in, H. & A. Adams, Genera of recent Mollusca, 111, 1858, pi. 106, fig. 1. 

 Mesodesma — Deshayes, Reeve, Conchol. icon., VIll, Mesodesma, Sp. 20. 



— — Lamarck, Issel, Malacol. d. Mar Rosso, 1869, p. 53, No. 18. 



— — — Pagenstecher, Ueber d. v. Kossmann am Rothen Meere ges. Mollusken, 



1877, p. 41, No. 32. 



— glabratum, — E. v. Martens, Moll. d. Maskarenen u. Seychellen, 1880, p. 152. 



— (Paphia) glabratum, Lamarck, E.v. Martens, Journ. Linnean Soc, Zoology, vol. 21, 1887, p. 215, 

 No. 375. 



— glabratum, Lamarck, Dautzenherg & Fischer, Journ. de Conchyl., vol. 53, 1905, p. 233. 

 Mactra sulcata, Valenciennes, Encyclop. method., 1791, pi. 257, fig. 3 (nomen). 



Mesodesma mitis, Deshayes, Reeve, Conchol. icon., VIII, Mesodesma, Sp. 29. 



— Savigngi, Jousseaume, Descr. d Moll. rec. p. Faurot dans la mer Rouge et le golfe d'Aden, 

 (1888), p. 206, No. 142. 



South coast of Koh Chang, shallow water, buried in the sand (79). Koh Kahdat, 

 ] fathom, sand (8). Koh Mak, sandy coast ('/a). 



Long. 10 — 31 mm. 



Distribution: — Singapore, Salang, Mergui Isis., Andamans, Ceylon ("Extends 

 from Ceylon throughout the Indian Ocean," Melvill and Sykes), Maldives, Gulf of 

 Aden, Red Sea, Suez, Seychelles, Amirautés, Madagascar, Mascarenes, Mozambique, 

 Querimba Isis. — Philippines (v. Martens), Tonkin, Thursday Isl. (Torres Strait), 

 "Australia" (v. Martens). 



Mesodesma striata, Chemn., and M. glabrata, Lam., have undoubtedly frequently 

 been confused with each other by several authors; thus, M. striata is recorded by 

 Caramagna"^ and Mörch, ' to have been taken from the Red Sea and at Aden ;f and I 

 believe that also Morlet's^ M. striata, from "lies du golfe de Siani" unquestionably 

 refers to specimens of M. glabrata, Lam. In addition to this, these two species are 

 very badly characterized and figured. Chemnitz says, e. g. regarding his striata, 

 that "nur allein die Wirbelspitzen sind fast völlig glatt," but this is seen very 



• P. Fischer (Manuel de Conchyl., p. 113) rejects Lamarck's generic name Paphia and adopts 

 Swainson's name Eryx. Dall (Proc. Malacol. Soc. London, 1, p. 213| thinks that tliis name is not satis- 

 factory as it is "preoccupied in zoology" and makes a new name, viz. Atactodea. 



- Proc. Zool. Soc. London, 1891, p. 435. 



3 Catal. conchyl. quæ rel. Yoldi, II, p. 16, No, 166. 



" Journal de Conchyliologie, vol. 37, 1889, p. 172, No. 87. 



