— 34 — 



7. GYMNOPLAX MELANOTREPHUS, Rochbr. 



G. — Testa ovata, suhcarinata, intense castanea; valva 

 antica, posticœ parte postica et valvarum intermediarum 

 areis laieralihus radiatim lyratis; lyris acutis, obticse denta- 

 tis; areis centralibus suhtilissime rugosis. 



Ligamento marginis suhlato, castaneo, inaculis quadratis 

 aurantiacis regulariter cincto. — Long. 0,0 tS ; lat. 0,010. 



Hah. Cap de Bonne-Espérance. — Rare. Mus. Paris. 



ESPÈCES AMÉRICAINES 



8. CHŒTOPLEURA VENERIS, Rochbr. 



C. — Testa ovata., carinata, fuliginosa; valva antica ra- 

 diatim costata, costis latis, lacunosis ; valva postica minima ; 

 valvarum intermediarum areis lateralihus bicostatis, puncta- 

 tis; areis centralibus sulcatis, sulcis imbricatis, later aliter 

 spinulosis. 



Ligam,ento marginis lato, fuliginoso, setis albis vestito. — 

 Long. 0,023; lat. 0,0U. 



Hab. Pounta-Arenas (mission Lebrun, Patagonie). — 

 Rare. Mus. Paris. 



9. CHŒTOPLEURA AHNNI, Rochbr. 



C. — Testa late ovata, complanata, obtuse carinata, cœru- 

 leo violacea, striis fuscis passim vestita; valva antica rotun- 

 data, 10 costata; postica minima elliptica subumbonata ; valvis 

 intermediis latis, areis lateralibus angustissimis lœvibus, costis 

 moniliferis cinctis; areis centralibus concentrice lyratis et 

 minutissime striatis. 



Ligamento marginis lato, fusco pilis fulvis, longis vestito. 

 — Long. 0,060; lat. 0,041. 



Bab. Pounta-Arenas (mission Lebrun, Patagonie). — 

 Commun. Mus. Paris. 



