150 MR JAMES COSMO MELVILL AND MR ROBERT STANDEN ON THE 



this species in honour of M. Edouard Lamy, its original describer, the specific name 

 he selected having been already employed by M. Deshayes. 



? Scacchia plenilunium, sp. n. (Plate, figs. 20, 20«). 



Sc. testa parva, elliptico-rotunda, convexa, nitida, albida, epidermide pallide olivacea, omnino contecta, 

 laevigata, striis concentricis incrementalibus exceptis, apud unibones obtusos nequaquam prominulos, crassiore, 

 marginibus fere rotundis, margiue dorsali intus pluteato, ligamento partim interno, dentibus lateralibus in 

 valve utraque utrinque extensis, pagina interna pallide cinerea. 



Alt. 4, lat. 4'5, diam. 2 mm. 



Hab. — Shore, Cape Pembroke, Falkland Islands. 



A small, rounded, somewhat convex shell, with shining pale olive epidermis, smooth^ 

 save for the concentric lines of growth. We are not sure of its genus ; but in some 

 respects it possesses affinity to the European Scacchia elliptica, Phil. Within, the 

 inner side of the dorsal margin protrudes as a kind of flattened narrow shelf or buttress 

 in both valves, the extended lateral teeth being placed at either extremity of it. 

 [Plenilunium, a full moon, from the rounded form.) 



Sub-order tellinacea. 



Family Tellinidw. 



Tellina (Msera) pusilla (Philippi). 



Tellina jms ilia, Pliil., Moll. Sic, i., p. 29, t. iii., fig. 9 a, b. 



„ pygmsea, "Phil." ; Loven, in Forbes and Hanley, i., p. 295, pi. xix., figs. 6, 7. 



Hab. — Shore, Gough Island, April 22, 1904. 



Only one half valve, but perfect, and coloured with rose radiations. We cannot 

 separate it from the British species, which apparently has a wide range in the eastern 

 tropics. It occurs, for instance, in the Persian Gulf, and on the Mekran Coast ; and 

 this occurrence at Gough Island shows a further extension of its range southward in 

 the Indian Ocean. 



Sub-order veneracea. 



Family Veneridse. 



Chione philomela (Smith). 



Venus philomela, E. A. Smith, Report " Challenger" Exp.: Lamillibr., Zool., xiii., p. 117, pi. ii., 

 figs. 7, lb (1885). 



Hab. — Trawl, Gough Island, at 100 fathoms, April 23, 1904. 



Only small, dead, and imperfect examples. Originally described from Nightingale 

 Island, one of the Tristan d'Acunha group, and within measurable distance of Gough 

 Island. 



