el PALEONTOLOGY OF MINNESOTA. 
celata, 653, 654. 
centralis, 652. 
cincinnatiensis, 655, 658. 
distans, 659. 
dorsicornis, 639, 
duplicata, 654, 652, 655, 658, 659. 
elongata, 648, 659. 
var. nuda, 647, 648. 
excavata, 659. 
gibbera, 655. 
glabra, 639. 
humilis, 650, 651. 
impressa, 650. 
maccoyli, 644. 
mammata, 652, 650. 
matutina, 647. 
micula, 6538. 
milleri, 653. 
minuta, 687, 647, 688. 
minutissima, 651. 
mundula, 650, 656. 
parallela, 658. 
plana, 659. 
renulina, 650. 
sancti pauli, 652, 650, 653. 
sculptilis, 656. 
seminulum, 656. 
simplex, 656. 
trigonalis, 652. 
tumida, 655, 652-654, 658. 
ulrichi, 647. 
umbonata, 659. 
unicornis, 649, 647. 
uphami, 651, 683. 
variolata, 650, 652. 
whitfieldi, 647. 
Primitiella, 647, 632, 643, 650, 688. 
constricta, 647, 648. 
fillmorensis, 649. 
limbata, 648, 647. 
minuta, 648. 
simulans, 648. 
unicornis, 649. 
Primitiopsis, 632, 659. 
Prisconoia, 486. 
Proetus, 724, 752. 
parviusculus, 754. 
stonemani, 724. 
Prolobella, 532, 485, 501. 
striatula, 532, 533. 
trentonensis, 532. 
Promacrus, 486. 
Prorhynchus, 487. 
Prosobranchiata, 930, 814, 817, 819, 845. 
Proteobranchia, $19, 818. 
Protoconch, 764. 
Protowarthia, 867, $48, 849, 854-857, 868, 869, 873, 
876, 914, 922, 923. 
acutilira, 848. 
pilobata, 869*, 848, 873, 875. 
cancellata, $72, 848, 868, 870, 873. 
var. trentonensis, 872. 
cassinensis, 848. 
concinna, $74, 848. 
granistriata, 870, 848, 871, 872, 922, 924. 
morrowensis, 848. 
obesa, 874, 848, 875. 
pervoluta, $71, 831, 848, 872, 875. 
planodorsata, $71, 848, 872, 873. 
rectangularis, 868, 848, 869, 870, 872. 
subcompressa, 873, 848, 874. 
Protowarthiide, $47. 
Prothyrids, 487. 
Prothyris, 487. 
Protomya, 487. 
Pseudomonotis, 485. 
Pseudomelaniidz, 1069. 
Pseudospherexochus, 734, 736, 737. 
prolificus, 738 
trentonensis, 734, 735*, 738. 
Psiloconcha, 630, 485, 501, 517, 531. 
elliptica, 530*. 
grandis, 530*. 
minnesotensis, 531. 
Psilonychia, 485. 
Pterinea, 483, 485, 489. 
undata, 497. 
Pterinopecten. 485. 
Pteronitella, 485. 
Pteronites, 485. 
Pteropoda, $18, 815, 817, 842, 844, 845, 857, 926, $27. 
Pterotheca, 857, 926, 927. 
Pterygometopus, 727, 729, 731-733. 
callicephalus, 731*, 730, 732. 
eboraceus, 728*, 729*, 732, 733. 
intermedius, 727, 728*, 729, 730, 732. 
schmidti, 729, 730*, 731, 732. 
Ptychodesma, 533, 486. 
Ptychomphalus, 960. 
Ptychopteria, 485. 
Ptychopyge, 709, 704, 705, 710. 
ulrichi, 709*, 
Pulmogastropoda, 817. 
Pulmonata, $19, 814, 817, 845. 
Pulmonifera, 817. 
Pygidium, 698, 696. 
Pyramidellidx, 960. 
Pyranomya, 501, 485. 
Pyrenomeceus, 486. 
Pyrgotrochus, 957, 949, 960. 
Raphistoma, 940, 930, 931, 932-942, 944, 945, 992, 
993, 1000, 1004, 1029, 1032, 1047. 
americanum, 940. 
calyx, 941. 
crevieri, 941. 
_ damesi, 1035. 
junior, 958. 
lapicida, 942, 932, 938, 940. 
lenticulare, 995, 940, 996. 
nasoni, 1004, 
niagarensis, 940. 
peracutum, 940, 934*, 941. 
planistria, 935, 940. 
var. parvum, 940. 
planistriata, 932. 
preevium, 998. 
