INDEX. 



tlnio Abbevillensis &1 



" Africivniis 20 



,.76 



" Eequatus 89 



" aquilua 92 



" Blandinaus 65 



" Brownii 2T 



" Cambodiensis 33 



" Coloradoensis 34 



" Columbensis 75 



" concestator 66 



" Dunkerianus f. 25 



'' efifulgens 23 



" EUiottii 54 



" errans 60 



" excavatus 71 



" eximius 14 



" extcnsus 67 



" fallax 79 



" favosus 58 



" fumatus 88 



" gerainus 63 



" gracilior 56 



" gravidus 12 



" humilis 16 



" Hainesianua 9 



" Housei 11 



" inornatus 13 



" intercedens 77 



" Jamesianiis 52 



" lutens 11 



" Maconensis 93 



" Myersianus 10 



" naviculoides 94 



" Newcombianus 32 



" nucleus 26 



" Nuttallianus 30 



P.gc 



obnubilus 84 



opacus ge 



Othcaloogensis 74 



phaselus , 17 



pingnis 73 



Poeyanua 35 



pyriformis 69 



pullatus 57 



rostriformis 64 



rubellinus 70 



rufus 85 



rusticus 14 



rutilans 59 



Sagittarius 18 



Savannabensis 81 



scobinatus 19 



Shurtleffianus 22 



Shuttleworthii 24 



similis 91 



suavidlcus 29 



subellipsis 62 



subgibbosus 53 



subflavus 90 



sublatus 82 



substriatus 20 



tenebricus 83 



tumidulus 15 



umbrosus 31 



umbrans 72 



Verreauianus 21 



vicious 61 



virens 80 



viridicatus 87 



Wheatleyanus 28 



Anodonta Holtonis 36 



Plagiodon isocardioides 37 



Triquetra contorta 39 



Embryonic Forms of Unio 



" " Margaritana., 

 " ■■ Anodonta 



Ovum of Tnio eubangulatus 



'ages 40 to 48 



48 and 4D 



49 and 50 



50 



