268 



BUI.LETIN 31 



268 



Trinacria cainei 20 46 



cossmanni 20 45 



cuneus iS...TjJ, 38 



decisa 18, ig 41 



declivis ig 42 



ellipsis ig...\\, 45 



ledoides ; 75...38, 41 



var. lisbonei;isis 45 



ovalis ig 43 



pectuncularis ig 42 



perplana /p. ..43. 45 



pulchra /5...40, 41 



var. sabinica 18 41 



Venericardia 77 



alticostata JO...82, 85 



bilineata 82 



blandingi 82, 86 



carsonensis 85 



coloradonis ^o...8i,85 



complexicosta j/ 84 



densata 77 



eutawcolens 85 



var. flabellum ^9...8o, 85 



fungina 85 



var. fungina 28 79 



funiculus ^7...79, 85 



greggiana 83, 85 



inflatior .j/ 87 



var. juvenis 88 



Venericardia mooreana 77 



natchitoches JO...82, 85 



parva J/...87, 88 



perantiqua 85 



planicosta 27, 28. ..Tj 



potapacoensis 77 



prsecisa 85 



rotunda 28, 2g..'jS, 85 



var. secans 82, 86 



subrotunda 86 



var. symmetrica 88 



subquadrata 82 



tetrica 85 



tortidens j/ 87 



var. trapaquara 2g 80 



trapaquara JO....81, 85 



vigintinaria 77 > 86 



wilcoxensis 83, 85 



Venus retisculpta 153 



vespertina 144 



Verticordia dalliana 183 



eocensis .^^ 182 



mississippiensis .^^ 181 



sotoensis 182 



X 



Xylophaga ? mississippiensis 59 198 



Y 



Yoldia claibornensis 2^ 72 



psammotsea 55 72 



END OF VOI^UME VI 



