cxlviii 



THE PALEONTOLOGY OF MINNESOTA. 



Ortonella, 535, 486. 



Ostracoda, chapter on, 629-693. 



Owenella, 8*7, 845, 848-850, 856, 857, 868. 876. 



antiquata, 1080*, 848. 



Oxydiscua. 912, 850, 851, 852, 858-860, 868, 913, 914, 

 926. 



acutus, 869*, 852. 



cristatus, 914, 852, 913. 



curvilineatus, 852. 



delanonii, 652. 



disculus, 913. 



discus, 852. 



imitator, 852. 



magnus, 852. 



orbiculatus, 852. 



planissimus, 852. 



scutigera, 852. 



subacutus, 913, 852, 914. 



Pachydlctya foliata, 685. 



Pachydomella, 632. 



Pal;eacmea, 836, 821, 825, 837, 838. 



humilis, 837, 836. 



irvingi, 836. 



orphyne, 836. 



quebecensis, 836. 



solarium, 836. 



typica, 822, 836. 



P;il:r;m;it inn. 487. 



Palaeanatinidae, 487. 

 Patearco, 534-536, 539. 



ventricosa, 573, 540, 574. 

 Palaeocardia, 489, 485. 

 Palteoamcha, 578, 580, 600, 605. 



faberi, 604, 60S. 



obliqua, 604. 

 Palaeocypris, 630. 

 Palaoneilo, 582, 486. 

 Palaeopinna, 485. 

 Palasosolen, 487. 

 Pallia! line, 480, 476. 

 Palpebral lobe, 697. 

 Paracardium, 486. 

 Pararca, 486. 

 Pararcidas, 486. 

 Paracyclas, 487. 

 Patella, 819. 



Patellacea, 8^9, 818, 841-846. 

 Patellidaa, 819, 816, 820, 821, 823, 825, 837, 842. 

 Patellostium, 854, !iir>. 

 Pecten, 479. 

 Pectenidae, 485. 



Pectinibranchiata, 930, 819, 844. 

 PeUcypoda,t475, 484, 409. 

 Penenka, 486. 



Peristome of Gastropoda, 815. 

 Permian Ostracoda, 631. 

 Pernopecten, 485. 

 Perotrochus, 949, 960. 

 Phacopidse, 732, 726. 



observations on American Lower Silurian, 732. 

 Phacops, 704, 734, 751, 752. 



callicephalus, 7S1. 



lopatini, 729. 

 orestes, 734. 

 rana, 704, 705. 

 trisulcatus, 734. 

 Phanerotinus, 1024. 

 eboracensis, 1024. 

 laxus, 1024. 



paradoxus, 1024. 

 Phanerotrema, 952, 949, 990, 991, 1008. 



labrosa, 952. 

 Philomedes, 632,631. 



philoxene, 1024. 

 Pholadella, 619, 487, 517, 620. 

 Pholadellidse, 618, 487, 526, 623. 

 Phorus, 1024. 

 Phragmolites, 851, 904, 905. 



compressus, 905. 

 Phragmostoma, 926, 854, 857. 



cunulce., 927. 



cymbula, 927. 



natator, 927. 

 Phreatura, 632. 

 Phthonia, 486. 

 Physa, 815. 

 Physetomya, 487. 

 Piloceras, 767, 765, 768, 769, 772, 774, 776, 777. 



amplum, 768, 769. 



canadense, 769. 



explanator, 768, 769. 



gracile, 769. 



invaginatum, 769. 



newton-winchelli, 767, 768*, 769, 812. 



triton, 769. 



wortheni, 769. 

 Pinna, 485. 

 Pinnidae. 485. 

 Pithodea, 960. 

 Placentula, 632, 681, 683. 



excavata, 682. 



inornata, 656. 

 Placophora, 817. 

 Platyceras, 1068, 1044, 1064, 1069. 



depressum, 1OO9. 



wisconsinensis, 1OO8, 1069. 

 Platyceridae, 1044. 

 Platyloron, 960. 

 Platymetopus, 746, 748, 752, 753. 



bicornis, 748, 753. 



cucullus, 74O, 747, 753. 



jukesi, 753. 



minganensis, 753. 



roliliinsi, 747*. 748, 753. 



trentunensis, 753. 

 Platynotus, 753. 



boltoni, 753. 



breviceps, 753. 



harrisi, 753. 



nereus, 753. 



trentonensis, 752. 

 Platyostoma, 822. 



trigonostoma, 940. 

 Platystoma, 1064. 

 Plectambonites sericea, 746, 798. 

 Plethocardia, 575, 487, 576. 



