679 



Sect. 1 . Ventral margin smooth within. 



1. Tapes rariflamma (pi. cxlv. f. 3, 4, 5), Lamarck (Venus), 

 sp. 45. Anim. sans vert Var. Venus marmorata, Lamarck? 



T. testa crassa, ovali, tumidfi, suba?quilaterali, })lanulatira li- 

 rata, sulcis intermediis subdistantibus in medio subobsoletis fulva, 

 macidis elongatis castaneis et altcris albescentibus triradiata ; 

 margine dorsali livido, rufo-lineato, excavato; margine ventrali 

 rotundato. 



An oval tumid shell, with flat ribs divided by rather distant 

 grooves, which are more shallow in tlic middle; the colouring is 

 bay, with three radiating rows of distant arrow-headed spots 

 with white spaces under them. 



Senegal. 



2. Tapes papilionacea (pi. cxlv. f. 1, 2), Lamarck (Venus), 

 Anim. sans vert. 



T. testa clongata, subcompressa, planulatim lirata, postice par- 

 tim laevigata ; straminea, griseo et rufo minute maculata, maculis 

 castaneis magnis quatuor radiata, intus ad marginem purpureo- 

 maculata ; margine dorsali litcrato, postice arcuato, elongato, de- 

 clivi, antice excavato; lunula indistinct^ lanccolata; margine 

 ventrali postice subtruncato, vix emarginato, antice elevato. 



Long, rather flat, with flattened ridges reaching nearly to the 

 back; the dorsal edge is arched and gradually sloped at the back, 

 while in front it is rather excavated than otherwise; it is marked 

 on both sides witli fine lines. The ventral margin is more swollen 

 in front than at the back, but turned up towards the dorsal mar- 

 gin. It is straw-coloured, with greyish and reddish small spots, 

 and four radiating rows of large squarish chestnut-coloured spots. 

 The inner margin is marked with purple spots. 



Ceylon. 



3. Tapes lirata (pi. cxlv. f. 19), Philippi (Venus), Abbild. 

 pi. vii. f. 5. 



T. testa subrhomboidea, rotundatim sulcis profundis lirata; 

 pallide rufa, fusco punctatim literata, maculis magnis castaneis 

 quadriradiata ; margine dorsali litcrato, utrinque rectiusculo, gra- 

 datim declivi, margine ventrali rectiusculo, antice paululuni 

 elevato. 



4 T 



