SCIENTIFIC INDEX. exlix 
suberecta, 577. missouriensis, 956. 
umbonata, 576, 509, 575, 577. munsteriana, 958, 
Plethomytilus, 494, 485, 489. nasont, 1004. 
Plethospira, 1008, 958, 989, 1009, 1011, 1013. niota, 1052. 
cassina, 1009*. nitella, 955, 956. 
semele, 1010, 989. numeria, 994. 
striata, 1011. occidens, 952. 
Pleure, 697. ohioensis, 961,950. 
Pleural groove, 697. percarinata, 1055, 1056. 
Pleuronotus, 1026, 1025, 1028, 1029, 1032. planidorsalis, 955. 
Pleurotomaria, 815, 844, 984, 935, 938, 940, 941, 942, progne, 996. 
950, 960, 961, 992, 1600, 1004, 2005, 1006, 1008, 1011, radians, 958. 
1028, 1056. ramsayt, 954. 
adjutor, 955, replicata, 936. 
alata, 938, 939. robusta, 964, 989. 
americana, 953, 996. var. levissima, 964. 
amphitrite, 954. rotalia, 957, 958. 
angelica, 1000. scutulata, 950, 1005. 
beekmanensis, 954. semele, 1010. 
bicincta, 1052, 963. shumardi, 955, 956. 
bilia, 1058. speciosa, 953. 
bitorquata, 957. spherulata, 957, 949. 
brazoensis, 964, 950. subconica, 1006, 954, 1005, 1052. 
calyx, 940. subscalaris, 953. 
carbonaria, 949. subtilistriata, 994. 
carinata, 955. sulcomarginata, 955, 949, 956, 1001. 
claustrata, 1005. supracingulata, 1004. 
clivosa, 1054. tabulata, 949, 950, 953. 
creviert, 940. textiligera, 956. 
cyclonemoides, 1012. tropidophora, 1081, 
depressa, 958. turbiniformis, 956, 949, 
diffictlis, 1011. umbilicata, 1047. 
docens, 994. ; valida, 1009. 
doubtful species of, 959. ventricosa, 1011. 
dryope, 1063. : vitruvia, 995. 
elegantula, 955, 956. Pleurotomariide, 946, 814, 844, 845, 930, 931, 935, 
ella, 956, 1006. 938, 944-949, 952, 954, 955, 960, 962, 991-993, 1005, 
etna, 954, 949. 1007, 1012, 1021, 1023, 1025, 1028-1030, 1032, 1033, 
eugenia, 994. 1043, 1052, 1054. 
filitexta, 956, 1006. Synopsis of generic groups, 951. 
glandiformis, 1005, Polycope, 632, 631. 
gradata, 1005. sublenticularis, 642. 
grayvillensis, 952. Polycopide, 632. 
harpya, 937. Polyphemopsis, 1069, 1079. 
hebe, 956, 1006. imornata, 1079. 
helena, 994. louisville, 1079. 
heliciformis, 958. nitidula, 1079. 
helicina, 957. peracuta, 1079. 
hindei, 1005. planilateralis, 1079. 
holmi, 968. Polyplacophora, $18, 817, 845. 
hortensia, 937. Polytrophide, 1043. 
ilinoisensis, 958. Polytrophis, 1043, 1028, 1058. 
interrupts, 955. Pontocypris, 632, 631, 690. 
itys, 1006. Porcellia, 858, 859, 905, 912. 
kokeni, 957, 958. scutigerus, 852. 
labrosa, 952, 949, 990. Posidonomya, 485. 
latezonata, 1005. Poterioceras, 796, 764. 
laurentina, 942. apertum, 796, 812. 
lenticularis, 995. cassinense, 796. 
limata, 955, 950. Prasinvide, 501. 
lloydii, 1012. Preservation and methods of study of Lamelli- 
lucina, 956, 1006. branchiata, 481. 
marcouiana, 952. Primitia, 650, 630-632, 639, 640, 643, 647, 649-652, 
micula, 994, 958. 654, 656-658, 664, 688. 
beyrichiana, 647. 
