218 12 
i 
West of Koh Kut, 30 fathoms, sand and mud (?/2). 
Long. 6 mm., alt. 8 mm. 
Distribution:— Philippines (Cumina), Sumatra (Martin, 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.111, No. 5. 
Mesodesma = DesuayEs, Hist. nat. d. anim. s. vert., éd. 2, VI, p. 133, No. 2. 
— — Lamarck, Savicny, Descript. de ’Egypte. Mollusques, pl. 8, fig. 5. 
Paphia = Gme.in, H. & A. Apams, Genera of recent Mollusca, III, 1858, pl. 106, fig. 1. 
Mesodesma — DrsHAyES, ReEEveE, Conchol. icon., VII, Mesodesma, Sp. 20. 
— “= Lamarck, IssEL, Malacol. d. Mar Rosso, 1869, p. 53, No. 18. 
— — — PaGenstecnER, Ueber d. vy. 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, DaurzenBpeRG & FiscHER, Journ. de Conchyl., vol. 538, 1905, p. 233. 
Mactra sulcata, VALENCIENNES, Encyclop. méthod., 1791, pl. 257, fig. 3 (nomen). 
Mesodesma mitis, DESHAYES, REEVE, Conchol. icon., VIII, Mesodesma, Sp. 29. 
_— Savignyi, Jousseaumr, 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, 
1 fathom, sand (8). Koh Mak, sandy coast (*/:). 
Long. 10—31 mm. 
Distribution: — Singapore, Salang, Mergui Isls., Andamans, Ceylon (“Extends 
from Ceylon throughout the Indian Ocean,’ Metvitt and SyKes), Maldives, Gulf of 
Aden, Red Sea, Suez, Seychelles, Amirantes, Madagascar, Mascarenes, Mozambique, 
Querimba Isls. — Philippines (v. Marrens), 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 
CaraAMAGNA” and MOrcu,* to have been taken from the Red Sea and at Aden; and I 
believe that also Mor.er’s* M. striata, from “Iles du golfe de Siam” unquestionably 
refers to specimens of M. glabrata, Lam. In addition to this, these two species are 
very badly characterized and figured. CnHEMNITz says, e. g. regarding his striata, 
that “nur allein die Wirbelspitzen sind fast vollig glatt,’ but this is seen very 
1 Pp. FiscHer (Manuel de Conchyl., p. 113) rejects Lamarck’s generic name Paphia and adopts 
Swainson’s name Eryx. Daw (Proc. Malacol. Soc. London, I, p. 2138) thinks that this 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. 
* Catal. conchyl. que rel. Yoldi, I, p, 16, No. 166. 
* Journal de Conchyliologie, vol. 37, 1889, p. 172, No. 87. 
