138 42 



Several specimens were taken between Cape Liant and Koh Kahdat in 1 — 15 

 fathoms, boring in old coral blocks, and from sandy bottom. Young specimens 

 were taken from mud and stony bottom. 



Long. 6—26 mm. 



Distribution: — Malacca, Mergui Archip., the Gulf of Manaar (Thurston), 

 Karachi? (Mklvill & Standen), Persian Gulf (Annandai.e), Hulule Isl. (Edg. Smith), 

 Zanzibar and Aldabra Isl. (Voeltzkow). — Philippines, New Guinea, Cape York, 

 North Australia ("Challencer"), New Caledonia, Tahiti. 



The present species, like all boring Molluscs, is subject to great variation in 

 regard to form; I have put L. subula, Reeve, and Bunker's L. cavernosa and reti- 

 culata as synonymous forms, and several more could no doubt be added. Cm. 

 Hedley' supposes that L. levigata, Q. and G. ^ is the same species as L. Malaccana, 

 Reeve; should this prove to be the case. Reeve's name for it must yield to that of 

 QuoY and Gaimard, which has the priority. Besides boring holes in coral blocks, 

 shells, and similar objects, this species often makes free "chalk houses," there is, 

 for instance, a specimen of Chama multisquamosa, Reeve from Koh Kahdat, in one 

 of the valves of which two individuals of L. Malaccana have made their two "houses" 

 side by side; these are smooth interiorly, agreeing exactly in form with that of the 

 Lithodomus-\al\'e, and their only communication with the outer world is through an 

 oblong hole bored in the valve of the Chama. 



Lithodomus (Botula) cinnamomea, Chemn. 



Mgtilus cinnamominus, Chemnitz, Conchyl. Cabin., VIII, 178,5, p. 152, pi. 82, fig. 731. 



Modiola cinnamomea, Lamauck, Encyclop. method., pi. 221, fig. 4. 



Lithodomus cinnamominus, Chemnitz, Reeve, Conchol. icon., X, Lithodomus, Sp. 5. 



— cinnamomeus, — Fischer, Catal. d. Moll, de I'lndo-Chine, p. 213. 



Mytilus fuscus, Gmelin, Syst. Nat., ed. XIII, p. 3359, No. 35. 



Lithophaga fiisca, Gmelin, Mahtini u. Chemnitz, Conchyl. Cabin., VIII Bd. 3 Abtli., \>. 25, pi. 6, figs. 8 — Î). 

 Modiola silicula, Lamarck, Anira. s. vert. Vll, 1836. p. 25, No. 19. 



Common from Cape Liant to Koh Chang, 1 — 30 fathoms, in old coral blocks, 

 on stony and shelly bottom. 



Long. 2—28 mm. 



Distribution:— Mergui Archip., Nicobars, Ceylon, Suvadiva Atoll (Maldive 

 Archip.), Karachi, Red Sea, the Gulf of Aden, east coast of Africa, Seychelles, Mau- 

 ritius, Bourbon. — Poulo Condor, Annam, Philippines, Torres Strait, Mast Head 

 Reef (Queensland), north-west Australia, New Caledonia, Paumotu Isl. — East coast 

 of America from Cape Fear to Guadaloupe. 



I agree entirely with Crosse and Fischer when they-^ write concerning 

 Chemnitz's species from the Nicobars: "Est-il réellement identique à la forme 

 analogue des Antilles?" The material at my disposal unfortunately is not con- 



' Australian Museum, Sydney, Memoir III, 1896 — 1900, p. 492. 

 - Voyage de l'Astrolabe, III, p. 464, pi. 78, figs. 17 — 18. 

 " Journal de Concliyliologie, XXXVII, 1889, p. 291. 



