— Ud — 



9. M ACTE A AMYGDALA. 



Testa ovalo-transversa, inflatay nucleiformis, vix inœ- 

 quilaleralis, tenuisy alba, epidermide îutea ad margines 

 indula, tenuissime et concenlrice slriala; antice rolundala^ 

 postice suhangulala et subprodncia ,- nalibus rotundalis, 

 apicibîis approximalis ^ ano vidvaqne parum impressis. 



Diam. anlero-post. 15, allit. iO mill. 



Habit, in sinu Spenceriano , Austraîiœ meridionalis 

 (coll. Angas). 



10. Mactra (mulinia) pinguis. 



Testa albo-hitea, ovato-trigona, postice valde carinala, 

 inflala , pinguis, amassa, paulum inœquilateralis , epider- 

 mide brunneo-nigrescente indula y concentrice regulariter 

 et minute striala; nalibus globosis, oblusis; margine an- 

 lico rotundalo, postico obtuse angidalo ; area poslica latis- 

 sima, planiuscula; cardine crasso ; pagina interna valva- 

 rum griseo-lulescenle. 



Diam. anlero-post. 27, allit. 23 mill. 



Habit, in Australia meridionali (coll. Angas). 



H. Periploma Angasi. 



Testa ovalo-transversa, subœquilateralis, alba, lenuis- 

 sima, fragilisy siétransliwiday concenlrice leviter slriala; 

 striis incrementi {valvœ dextrœ) eminentioribus^ antice ro- 

 tundata, postice rostrafay truncata; margine dorsali utrin- 

 querectilineo, ventrali arcuato et subsinuoso; valva dcxlra 

 sulco anlicoy vix impresso, radiante et car'ma obsoleta, 

 postica, mnnito. 



Diam. antero-post. 40, altit. 27 mill. 



Habit, in simi Spenceriano et in Tasmania {coW. Angas]. 



