MELVILt AND STANDEN : MARINE MOLLUSCA OF MADRAS. 8.1 



Margaritifera squamulosa Lm. — Young examples, which are 

 probably juvenile forms of M. flabellum Rv. ; if so, the Lamarckian 

 name, having priority, must stand. They are beautifully concentrically 

 squamate, the squamae long and very fragile. Tiger Bay. 



Margaritifera tegulata Rv. — Very delicate and beautiful 

 Roundish, thin, and thrice or four times longitudinally radiate. We 

 also have the young form, pale green, and very oblique, with the 

 characteristic radiate lines. Also from Moreton Bay. 



Margaritifera vexillum Rv. — Many, of a prettily zig-zag marked 

 Avicula, but all in quite young condition. Ceylon. 



Perna femoralis Lm. — Several, quite typical. Philippines. 



Perna isognomon L. — A few of this common East Indian form. 

 Philippines. 



Pinna attenuata Rv. — Two specimens ; typical. Moluccas. 



Family MYTILIDM. 



Mytilus viridis L. — Small, but well coloured. 



Modiolus metcalfei Hani. — A delicate species, very perfect in 

 condition. Philippines. 



Modiolus ramosus Hani. — Two specimens. Celebes. 



Lithophagus stramineus Dk. — Two. West Indies. 



Lithophagus teres Phil. — Three small sized specimens. A shell 

 of simple form and sculpture. Mazatlan. 



Modiolaria ccenobita Vaill. — An interesting form, described by 

 Vaillant from the Gulf of Suez. 



Family ARCIDAZ. 



Area imbricata Poli. — Very similar to the European A. tetra- 

 gona L. Aden (Brit. Mus.), Mediterranean, East Indies. 



Area inaequivalvis Brug.* — Many, in all stages. Indian Ocean, 

 Persian Gulf. 



Barbatia fusca Brug. — A quantity of this common Philippine 

 species. 



Barbatia lima Rv. — Two or three only. Philippines. 



Barbatia (Acar) pusilla Sow. — A neat squarrose shell, identical 

 with Tasmanian specimens received by the British Museum from Mr. 

 J. H. Ponsonby. 



Barbatia (Venusta) lactea L.* — Of very wide distribution, 

 being a common British and European species. Also from Bombay 

 and Arakan in the Blanford collection (Mus. Brit.). Mediterranean. 



Scapharca clathrata Rv. — Several. Philippines fCuming), 

 Aden (Brit. Mus.). 



Scapharca rhombea Born.* — A solid handsome shell. China, 

 Ceylon. 



