192 MESSES. J. C. MELVILL AND E. STANDEN OUT 



straminea, ad latera puniceo-maculata, et undique carneo- et 

 puniceo-siiffusa, ad margines flavescente, ligamento externo f 

 intus superficie pallide carnea, ad medium ochraceo-punicea,- 

 nitida, delicatissime striata, apud margines serrata. Alt. 25,- 

 lat. 21, diam. 15 mm. 



A remarkably elegant Trachycardmm, its nearest ally being 

 G. maculosum, "Wood, which it resembles in coloration, and to 

 some extent in form, it being, however, more equally oval, and 

 possessing about 58 as against 38 ribs. C. ohovale, Sow., and 

 C. mauritianmn, Desh., likewise C. arenicolum, Reeve, are akin, 

 but each possesses salient and marked individual characteristics 

 of its own. The species now before us differs from all others of 

 its section in its exceedingly fine longitudinal costuiations and 

 very delicate pink and pale yellow colour. It is roundly oval,, 

 thin, with, the umbones red, shining, closely approximate ; valves 

 extremely convex, dorsally speedily sloping both ways, and then 

 gently rounding off into the ventral margin. Within, the 

 surface is delicately longitudinally striate, pale flesh-colour, 

 yellowish red in the contre, shining, the margin of the valves 

 serrated. 



348. Caedium (Teachtcaedium) vaeie&atum, Sow. 



349. Caedium (Papteidea) papteaceum, OJiemn. 



350. Caediijm (L^vicaedium) Bechei, Ad. Sj- Bve. 



One young valve only. A species of extreme rarity, and 

 almost unknown in collections. Two magnificent specimens,, 

 formerly in the Colonial Exhibition of 1884, are now in the 

 British Museum (Nat. Hist.). 



Station 2, Warrior Island. 



351. Caedium (LiEVicAEDiuM) bieadiatum, JBrug. 

 Station 13, Mer; Station 8, Albany Pass. 



352. Caedium (L^vicaedium) lteatum, Sow. 



353. Hemicaedium subeetusum, Soio. 

 Station 10, Hammond Island. 



354. Hemicaedium (Peagum) unedo, L. 

 Station 13, Mer ; Station 5, Boydong Cays. 



