24 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



These specimens do not quite correspond with a series from the 

 Straits of Magellan. They appear to be rather more solid, of a darker 

 red colour, and perhaps a trifle more equilateral. This species, the 

 British L. rubra, Mtg., and L. consanguinea, Smith, from Kerguelen, 

 seem all to be slight modifications of one and the same form. 

 Z. seminulum, Phil. (= rulra, Mtg.), has been quoted by Sowerby as 

 South African. 



8. CYAMnrM OBLONGUM, n.sp. Figs. VIII, IX. (p. 22.) 



Testa elongata, valde insequilateralis, mediocriter convexa, alba; 

 pars antica brevissima, acute rotundata, postica longissima, latius 

 rotundata ; linea dorsi posterior vix arcuata, horizontalis, anterior 

 declivis, ventris margo leviter arcuatus ; valvse tenues, lineis incre- 

 menti tenuibus striatas ; pagina interna alba, nitida ; dentes duo 

 inasquales in valva sinistra, in dextra unions ; ligamentum internum 

 gracile, leviter obliquum ; cicatrix antica mediocriter profunda, postica 

 inconspicua. Long. 5, alt. 3, diam. 2*5 mm. 



Hob. — Macquarie Island (A. Hamilton). 



9. Mykina minitta, n.sp. Fig. IV. (p. 22.) 



Testa minuta, transversim ovata, valde insequilateralis, pallide 

 fuscescens vel rufescens ; valvse tenues, convexae, lineis incrementi 

 tenuibus striatse, margine supero et infero intus fortiter denticulatis ; 

 umbones inflati, obtusi, longe antemediani, linea cardinis recta, 

 utrinque transversim striata, in medio ligamento interrupta ; pagina 

 interna baud margaritacea, Isevis ; cicatrices obscurae. Long. 2, 

 alt. 1"5, diam. 1 mm. 



Hah. — " Lyttelton Harbour, in tide-pools on seaweeds " (Suter). 



This species is remarkable for the strong denticulate upper and 

 lower margins of the valves. The striae on the hinge-line are only 

 visible under a compound microscope. 



10. MoDioLAECA TEAPEziNA, Lamarck. 



For synonymy and references see Smith, Report Lamellibranchiata 

 "Challenger" Exped., p. 279. 



Hah. — Macquarie Island (A. Hamilton). 



Only bright purple-red specimens, the largest 16 mm. in length. 

 The species is common at South Patagonia, the Falkland Islands, 

 Marion and Kerguelen Islands. 



11. MODIOLARCA PTJSILLA (Gould). 



Mytilus {Ilodiolarca) pusillus, Gould : IJ.S. Explor. Exped., Moll., 

 p. 455, atlas, figs. 585-585c; Otia Conch., p. 95. 



Modiolarca pusilla, Smith: Phil. Trans. Roy. Soc, 1879, vol. clxviii, 

 p. 191. 



ilrt^.— Tierra del Fuego (Gould); Macquarie Island (A. Hamilton). 



