205 



Mensura desideratur. 



Deutes cardinales lamelliformes. Affinis u. ochraceo 

 Say, sed magls elongatus. 



Legit Conrad frcqnentem in fluminibus parvis prope 

 Cooper fluvium in Carolina australi. 



Conrad, uew fresh water sliells. p. 35. et tab. V. fig. 3. 



20. Unio pectorosus T, »^. Conrad. 



Un. testa ovata, ventricosa, haud crassa, anterius sub- 

 producta, posterius lata, blangulata; pube complanata; um- 

 bonlbus latls, promlnenllbus; rcglonc umbonali subangulata; 

 epldermide brunneo-ollvacea, maculls angulatis radlatim dis- 

 posltls et versus margluem posticum linels multls elcvatls 

 brcvibus vermlformlbus notata; intus alba. — Th. M. 



Mensura deslderatur. 



Llnea impressa a natibus ad medlum marglnem poste- 

 riorem porrecta est. dentes cardlnales rectl, subpyramida- 

 les, prominentes. Aceedlt ad u. ovatum Say, at magis 

 elongatus est, minus ventricosus, radllsque interruptis. 



Leglt Conrad in Elk flumlne prope Tennessee. 



Conrad, new fresh water shells. p. 37. et tab. VL fig. 1. 



21. Unio rubellus T. •fl, Conrad. 



Un. testa suborblculari, ventricosa, crassa; natlbus in- 

 termcdiis, promlnulls, erosls; reglone umbonali rotundata, 

 utrinque obsolete angulata; epidermlde rubro-brunnea; in- 

 tus margarltaceo - cai-nea purpureave. — Th. M. 



Mensura deslderatur. 



Dentes cardinales recti. imprcsslones muscularcs angu- 

 stae, dlstinctae. — Specicm auctor mlnus stabilitam, nec 

 tamcn alTus varietatem censet. 



Leglt Conrad in Black Warrior fluminc prope fontem, 

 ad montes Alabamae. 



Conrad, new fresh water shells. p. 38. et tab. VL fig. 2. 



22. Unio furvus T. .//. Conrad. 



Un. testa ovata, ventrlcosa, auterlus crassa, posterius 

 tenuiore, laliore, subangulata; reglone umbonali angulata, 



