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University of Michigan 



donaciformis 112, 50 



flexuosa 112, 71 



florentina 112, 69 



foliata 112, 71 



interrupta 112, 66 



obliqiiata 112, 68 



perplex?. 112, 70 



sulcata 112, 68 



torulosa 112, 70 



triquetra. ...;... .112, 50, 66 



triqueter 112, 65 



truncata 112. 49, 50, 65 



turgidula 112, 69 



Truncillopsis 112, 65, 66 



Tsuga canadensis. 109, 14; 111,27 

 Typha latifolia U)9, 8 



r 



Ulmus americana 



109, 11. 15; 111, 27 



Unio 112. 8, 27, 31, 52 



aeruginosus 106, 8 



aesopus 112, 19 



alata 112. ?,3 



alatus 112, 33 



alienigenus. . .106, 17, 18, 19 



amabalis 112. 27 



andersonensis 112, 6 



anodcntoides 112, 60 



asperrimus 112, 16 



astromarginatus 112, 9 



aztecorum . . . 106, 26 ; 1 12, 47 



beiiandierii 106. 24 



biangularis 112, 49 



biangulatus 112, 49 



biloba 112, 70, 71 



brevidens 112, 66, 67 



bullatus 112, 15 



buxeus 112, 31 



caelatus 112. 56, 57 



cardium 112. 63, 64 



carinata gibba...ll2, 62, 63 



carinatus 112, 48, 61, 62 



cariosa 112, 62 



cariopus 112, 61, 62 



catilliis 112, 23, 24 



cicatricosus 112, 19 



circulus 112, 45 



clava 112, 20. 25, 26 



coccineus 112, 23, 24 



cognatus 112, 49 



coloratus 106, 8, 9 



conradicus 112, 58 



cor 112, 6, 7, 27 



cordatus 112, 21, 22, 23 



corium 106, 10 



cornutus 112, 42 



corvunculus 112, 54, 56 



costatus 112. 12 



crapulus 112, 6 



crassa 112, 48 



crassidens 



...112, 10, 11, 27, 28, 29, 31 



var. a 112, 10 



var. b 112, 28 



crassus 112, 7, 8, 29, 47 



cuneata 112, 26 



cuneatus. .112, 26, 28, 29, 65 



cuprea 112, 31 



cylindrellus..ll2, 54, 55, 56 



cylindricus 112, 15, 17 



cyphia 112, 19 



cyphyus 112, 19 



dehiscens 112, 32 



delphlnulus 106, 24 



depressus 112, 51 



deviatus 112, 69 



dilatata.112, 28, 30, 31, 58, 59 



dilatatus 112, 30, 31 



discus 106, 21, 22 



dolabelloides 112, 19 



dombeyana 112, 10 



donaciformis 112. 50, 51 



ebenus 112, 4. 5, 21 



edgarianus 112, 6, 7 



elegans 112, 49, 50 



ellipsaria 112, 51 



ellipsis 112, 46 



elliptica 112, 25, 26, 48 



ellipticus 112, 48 



explicatus 106, 19, 28 



fasciata 112, 48. 61. 62 



cuprea 112, 31 



fasciatus 112, 48 



fasciola 112, 62, 63 



fasciolaris 112, 42, 48 



