INDEX. 233 



PLATKS. 



Orthis Continued. 



nisis 27 



propinqua 16 



rugaeplicata 27 



subnodosa 



vanuxemi ._ 16 



Fentamerella 



arata 13 



papilionensis 



thusnelda 31 



Pentamerus 



complanatus 27 



globulosus _ . 



knappi 28 



knotti 32 



knighti 29 



littoni 27 



nucleus 27, 33 



nysius, var. crassicostus 28 



nysius, var. tenuicostus 



oblongus 33 



oblongus, var. cylindricus _ _ 30 



pergibbosus 29 



uniplicatus 33 



ventricosus _ 33 



Productella 



semiglobosa 26 



subaculeata, var. cataracta 17 



Rhynchonella 



acinus - - - 32, 26 



bellaf orma 1 . 



Carolina . -. - 13 



gainesi - - - 31 



increbescens 34 



indianensis 33 



louisvillensis . . 31 



pisa 32 



rugaecosta 32 



saffordi - ._._-..,._. _. Tr ._,,_._,____ 27, 33 



. SUK. 30 



