striata, epidermide e viridi fucescente vestita; umbonibus proeminenlibus , 

 introrsis, approximatis, sub-anticis; ligamine mediocri, adpresso; lunula obso- 

 leta; dentibus parvis, medio recto; laminis sequalibus; margarita violacea. 



Long. : 32, ait. : 30, crass. : 20. 



Habitat. La Houai moyenne. 



47. GoRBicuLA Fluitans. h. 



Testa sub-tenui, solida, circa umbones inflata, valde insequilaterali, transversim 

 ovata, utrinque sub-attenuata, postice producta, plicis parvis, sulcisque latis 

 arcuato-striata, epidermide viridi brunnea vestita; umbonibus obtusis, truncato- 

 erosis; ligamine tenui, sat longo; lunula obsoleta fllo cincta; dentibus minutis, 

 medio sub-obliquo ; laminis sequalibus, vix incurvatis; margarita caerulea, alba, 

 vel violacea. 



Long. : 28, ait. : 24, crass. : 14 millim. 



Habitat. La Houai supérieure, branche de Lieou-ngan-lcheou. 



48. CORBICULA BOREALIS. H. 



Testa parva, fragili, sub-compressa, vix sequilaterali, plicis, sulcisque minutis 

 arcuato-striata, epidermide e lutea fusca; umbonibus obtusis, introrsis, approxi- 

 matis, erosulis; ligamine sub-inflato; lunula obsoleta; dentibus minutis, medio 

 recto; lamina antica longiore, ambabus incurvatis; margarita pallide ca3rulea, 

 intus rubescente. 



Long. : 19, ait. : 16, crass. : 10. 



Habitat. Le petit affluent, rive gauche de la Han, au-dessous de Fan-tch'eng, 

 Hou-pé. 



49. CORBICULA SORINIANA. H. 



Testa parva, fragili, sub-compressa, sub-trigona, transversim sub-ovata, plicis 

 minutis, sulcisque latis arcuato-striata, epidermide lutea vestita; umbonibus 

 obtusis, erosis; ligamine tenui; lunula obsoleta ; dentibus parvis, medio sub- 

 obliquo ; laminarum incurvatarum antica longiore ; margarita albo-livida, imo 

 rubescente. 



Long. : 21, ait. : 17, crass. : 8 millim. 



Habitat. Ruisseau des montagnes dans la province de Kouang-tong (M. l'abbé 

 Sorin). 



50. CoRBicuLA Delavayana. h. 



Testa mediocri, tenui, fragili, transversim late elliptica. utrinque obtusala, 

 plicis crassis, sulcisque latis arcuato-striata, epidermide brunneo-fusca vestita ; 



