— 13 — 



superans ac inferne usque ad 18 millim. post vertica- 

 lem Icviter amplians) in rostram inferum, obtuse ro- 

 tundatiim, attenuata ; — umljonibus robustis, inflato- 

 ventrosis , prominentibus , recurvis (liâtes inter se 

 leviter distantes, subrugoso-striati); sulco dorsali et 

 area indistinctis, in convexitate valvaruni confusis ; 

 cardine valido, crasso ; dente cardinali bipartite : luiiis 

 minutus, elongatus, prope marginem, alter crassus, 

 robustus, valde productus, triangularis, ad summum 

 acutus ac leviter fimbriatus ; lamella laterali crassa, 

 pervalida et robusta ; ligamento posteriori brevi, pro- 

 minente, castaneo ; lunella virguliformi, elongata 

 supra lamellœ extremitatem. 



UNIO BRIDOUXI 



Long. max. 48; ait. max. 28; ait. vertic. 26; crass. 

 max. 21 ; basis apico-rostralis 40; intervallum e nati- 

 tibus ad angulum 25, ex angulo ad rostrum 20, e 

 rostro ad verticalem et e basi verticalis ad angulum 

 œqualiter 33; regio antica 14, postica 35 millim. 



Concha elongato-oblonga, crassula, mediocriter 

 ponderosa, parum nitente, argutc striata (striœ prope 

 peripheriam foliaceœ), superne ad et ante nates ru- 

 goso-striata ; luteo-viride.scente, ad umbones luteola ; 

 intus pallide carneola; — valvis relative mediocriter 

 crassis et ponderosis , bihiantibus (biantiée [anterior 

 et posterior] vix apertœ, angustissimse), bene con- 

 vexis (convexitas regularis, maxima e linea vertica- 

 lis 8, e natibus 13, e rostro 27, ab antico margine 23. 

 ex anculo 17, et e basi verticaHs 18 millim. remota); 



