— 54 — 



calis 29 millim. remota) ; — supra recta usque ad 

 angulum sat acutum , dein subabrupte recteque 

 descendente; antice superne angulata, dein convexo- 

 decurrente ; infra arcuato-decurrente ac post verti- 

 calem valide convexa ; postice (regio postica in alti- 

 tudine ampla, duplicem anterioris fere attingens et 

 inferne usque ad 22 millim. post verticalem leviter 

 crescens) in rostrum inferum, subacute truncatulum, 

 attenuata; — umbonibus rotundato-inllatis, nihilo- 

 minus superne planulatis et marginem superum non 

 superantibus (nates peracutse) ; sulco dorsali sulculis 

 bene notatis distincte delimitato; area triangulari, 

 subcompressa ; cardine crassulo in tota longitudine 

 lamelliformi (lamella sat valida, crassula et subpro- 

 ducta) ; ligamento posteriori symphynoti ; lunella bre- 

 viter triangulari. 



BRAZZ.ŒA BRIDOUXI 



Long. max. 72; ait. max. 43; ait. vertic. 42; 

 crass. max. 33 ; basis apico-rostralis 55 ; intervallum 

 e natibus ad angulum 32, ex angulo ad rostrum 31, 

 e rostro ad verticalem 38 et e basi verticalis ad an- 

 gulum 46 ; regio antica 29, postica 45 millim. 



Concba irregulariter subangulato-oblonga, inflato- 

 ventrosa, sinuosa, postice angulosa, crassula, siib- 

 opacula, nitida, subtiliter striata (striai ad margines 

 validiores) et superne circa et super nates eleganter 

 rugosa; violaceo-nigrescente, super umbones decolo- 

 rata ac castaneo-violacea ; intus unilbrmiter vinoso- 

 violacea ; — valvis(l) crassulis, in ventre valvarum 



(I) Membrana ala-formis déficit. 



