34 BULLETIN NO. 30, UNITED STATES NATIONAL MUSEUM. 



Page. 



]^acrod<mtince 88 



Axininae 88 



Macrodontina- 89 



Grammatodun,M. &. II., 1858 89 



O. inornahm, M. &. II., 1858, pi. iii, figs. 9, 9 a, 9 6 90 



TJnionidcB 90-91 



Z7mo, Ketzius, 1788 92 



17. nwcreZi*, M. & U., 1858, pi. iii, figs. 13 a-c 92-93 



Orassatellidai 93 



Astarie, Sowcrl)j-, 1816 93-94 



A./ragilig,'M.&in., 1800, pi. iv, fig. 7 94 



A. i«or?ia<a, M. &. II.. ISOO, pi. iii, figs. 12o, 6 94 



Tancrediidce J 95 



Tancredia, Lycett, 1850 95-96 



T. warrenana,'M.. & H., 1860, pi. iii, fig. 7 96 



T.? 0P5?/afJ<craK*', M. & n., 1860, pi. iii, fig. 8 96-97 



Cardiidm 97 



rrotocardia, Beyiich, 1845 97-98 



P. «;iU7nardi, M. & H., 1860, figs. A, B on p. 98 98-99 



Anatinidce 99 



Myaeites (Schlot.), Munster, 1840 99-100 



jlf. ncbrascc;m«, M. &H., I860, pi. iv, fig. 5 100-101 



M. suhelUpticus, M. & H., 1858, pi. iv, figs. 6 a-c 101 



Tftracia, Leach, 1819 101-102 



r.? «i/6i<wt«, M. & H., 1860, pi. iv, figs. 4, 4 a 102 



T. ? arcuato, M. & H., 1860, pi. iv, fig. 8 102 



Pholadumya, Sowerby, 1823 102-103 



• Section I. — Species without a circumscribed cardinal area. 



Multicostatce, Agassiz. (Jurassic and Ciotaceous.) 

 Trij/onate, Agassiz. (Cretaceous, Tertiary, and Kecent.) 

 Bueardinai, Agassiz. (Lias to Tertiary.) 



Section II. — Species with a circumscribed cardfnal area. 



Flabellatce, Agassiz. (.Jurassic.) 

 Ovalcs, Agasfliz. (Jurassic.) 

 Oardissoides, Agassiz. (Jurassic.) 



Pholadomya humilis.M. & H., 18C0, pi. iv, figs. 3, o, 5 104 



Gasteropoda. 

 Ptdmonifera. 

 Inoperculata. 

 Limnophila. 



LimnaddcB 105-106 



Limnceince 105 



Physince 105 



Planorhince 105 



Planorbis, Miiller, 1774 106 



Planorhella, Haldeman 106 



Melisoma, Swainson 107 



Taphius, H. & A.Adams 107 



Menetus,!!. & A.Adams 107 



Anisus, Kitziuger 107 



Pathyomphalus, Agassiz {=Spirorbis, Swainson, not Lamk.) 107 



Oyraulus, Agassiz {^Nautilina, Stein) 107 



Planorbis vetemus, M. & H., 1860, pi. iv, figs. 1 & 1 a, 6 107 



Proiobranchiata. 

 Piphidoglossata. 

 Podopthalma. 



Neritidac 108 



NeriteUa, Humphrey, 1797 108-109 



N. nebrasccnsis, M. &n., 1861,flg8. — , on p. 109 109-110 



Cj/clobranchiata. 



DentaliidcE 110 



Denlalitim, Lin., 1740 ■- Ill 



D. subquadratum, Meok, 1860,fig.— ,,p.lll -- HI 



ClUnobranchiata {=Pectinibranch\ata). 



