78 



i86o; Lithodomiis nasntiis Reeve, Elem. Conch., II, p. 74. 



1869. Lithodoums iiasiitus von Martens, Von der Deckens Reise, p. 66. 



1871. Lithophagiis nasutus Lischke, Japan. Meeresconch., p. 152. 



1879. Litliodomiis nasiita von Martens, Monatsber. Kais. Akad. Wiss. Berlin, p. 741. 



1882. Lithophaga nasuta Dunker (ex parte) in Martini Chemn. Conch. -Cab. (N. F.), VIII (3), 



Lithophaga, p. 5, pi. I, fig. 5, pi. II, figs. 7, 8. 

 1882. Lithophaga nasuta Dunker, Ind. Moll. Mar. japon., p. 226. 



1887. Lithodomiis nasuta von Martens, Journ. Linn. Soc. London (Zool.), XXI, p. 206. 

 1891. Lithodoums nasutus Paetel, Cat. Conch. Samm., III, p. 199. 

 1895. Lithophaga nasuta Filsbry, Cat. Mar. Moll. Japan, p. 140. 

 1903. Lithodonius nasutus Smith, Faun. Geogr. Maldive, Laccadive Archipel., 11, p. 623. 



1905. Lithodonius nasutus Hidalgo, Cat. Filip., p. 365. 



1906. Lithophaga nasuta Owston, Japan. Loochooan Shells, p. 34. 



Reeve's figure of Lithodoimcs nasutus ^), as was pointed out by Lischke is certainly not 

 of the same species as Modiola nasuta of Philippi. Reeve's locality for the species, West Indies, 

 is also doubtful for Philippi gives Pacific Océan as probably the area whence his types of the 

 species were collected, and Dunker's spécimens of the species from the Cuming Collection were 

 from the Philippines. Dunker's figure differs from Philippi's in the gênerai outline, but from the 

 spécimens, which I hâve examined, it appears to represent the species more correctly. 



The characteri-stic features of the species appear to be the situation of the umbones near 

 the extrême ànterior end, the anterior end narrower than the rest of the shell, and the shell 

 valves compressed posteriorly vvith the margin evenl}^ rounded. 



Distribution : — L. (Z.) nasuta has been recorded from Japan and Philippines in the 

 Pacific and from Singapore and Mozambique Coast and the surrounding area in the Indian Océan. 



In the "Siboga" collection the species is represented by three complète shells and a single 

 valve from Anchorage off Dongala, Palos Bay, Celebes (St. 86), Pulu Sanguisiapo, Sulu 

 Archipelago (St. 93), Anchorage off the south point of Kabaëna Island (St. 209) and Ambon 

 Anchorage (St. 231). 



3. Lithophaga {^Lithophaga) levigata (Quoy & Gaimard). (Plate II, figs. 42, 43). 



1835. Lithodonius levigata ^woy & Gaimard, Voy. "Astrolabe", III, p. 464, pi. LXXVIll, figs. 17, 18. 

 1899. Lithophaga levigata Hedley, Mem. Austral. Mus., III, p. 492. 



I agrée with Hedley that L. (Z). levigata is the same form which has been generally 

 recorded as L. [L.) malaccana (Reeve) -) in literature, but with the material available it is not 

 possible for me to be definite as to which of the varions forms described by Reeve and Dunker 

 should be relegated to the synonymy of L. [L.) levigata. 



Lynge is right in assuming that L. {L) levigata, which he called L. (Z.) matacca7ia^ is 

 very variable, but much more of fresh material is required before its range of variation can be 

 properly understood. The "Siboga" spécimens differ in référence to the posterior margin being 

 almost truncate and straight or somewhat curved. 



i) Reeve, L. — Conch. Icon., X, Lithodomus.^ pi. Il, fig. loa, b (1857). 



2) Reeve, L. — Conch. Icon., X, Lithoiionnis. pi. IV, fig. 20 (1857). I hâve purposely refrained from giving a delailed syno- 

 nymy of L. malaccana in the above account, as I am not quite certain regarding the material which has been referred as L. malaccana 

 in literature. 



