32 BULLETIN NO. 30, UNITED STATES NATIONAL MUSEUM. 



Page. 

 liaTnellibraTichiata. 



Pteriida; ( - A vicuUclce) 27-30 



Pteriniince (or Pterinia group) 28 



Pteriinw (or Aviculnie) 28 



Melinmce (Perna or Isognomon group) 28 



Pteriniince 30 



Myalina, Koninck, 1842 30-32 



Shell structure of Myalina angulata, fig. — 31 



M. peraitenuata, M. & H., 1858, pi. i, figs. 12 a, b 32 



M. suhquadrata, Shumard, figs, a, ft, p. 33 32-33 



Orassatellidce : 34 



Pleurophorus, King, 1844 34-35 



Subgenus Oleidophonis, Hall, 1 847 35 



P. Occident aliti, M. & H., pi. i, figs. 11 a, & 35 



Anatinidce 36 



Allorisma, King, 1844 36-37 



A. suhcuneata,'il. &. H., 1858, pi. i, figs. 10 a, 6 37-38 



Sedgwickia,'McCoy,\U4: 38-40 



S. topekaensis ? , Shumard, 1858, llga. a, 6. p. 40 40-41 



S.? concava, M. & H., 1858, pi. i, figs. 8 a, 6 41 



SJ altirostrata, M. &. H., 1858, pi. i, fig. 9 41-42 



*Ohcenomya,ii. g., Moek, 1865 42-43 



O. leavenworthcnsis, M. & H., 1858, pi. ii, figs. 1 a-c 43-44 



O. cooijcri, M. & H., 1858, pi. ii, figs. 2 a, 6 44 



Qasteropoda. 

 Prosobranchiata. 

 Ehipidnglossata. 

 Podophthalma. 



Pleurotomariidce 44-45 



Pleurotomaria, Defrance, 1826 45-46 



P.AMmcrosa,M. &H.,1858,pl.i, figs. 14a,6 46-47 



P. SM6(Mr&in««a, M. & H., 1858, pi. i, fig. 13 47 



CAREONIFEKOUS AGE. (PERMIAN PERIOD.) 



Mollusca. 

 Lamellibranchiata. 



Pectinidoe 48 



Pcctinince 48 



Aviculo-pectinince 49 



Aviculopectinince 49 



Aviculopectcn, McCoy, 1851 49 



A. amplus, M. it W., flg. — , p. 50 50 



A viculopecten, .?, pi. ii, fig. 10 50 



A. macoyi, pi. ii, tig. 9 50-51 



Pteriidce. 



Pteriniince 51 



Myalina, Koninck, 1842 51 



M. avie^doides, M. & H., 1860, pi. ii, figs. 8 a-d 51-52 



If. p«r»manrt. Swallow, 1858, pi. ii, figs. 7 a-c 62 



PteriincB. 



J?wmicro«is, Meek, 1864 5.'J-54 



E.hawni, M. & II., pi. ii, figs. 5 a-«, and flg. 1, p. 54 54-55 



Shell structure of E. ciirta. No. 2, p. — 54 



E.hawni var. ovata, pi. ii, figs. 5 a, b 55 



' Melininie. 



Bakevellia, King, 1848 57 



B.parva.M. &. H., 1858, pi. ii, figs. 12 o, b 57 



TriyoniidcB -. 57_58 



Schizodus, King, 184C 58-59 



S.ovatus,M.&. H., 1858, pi. ii, figs. 11 a,b 69 



Nuculanidce 59-60 



Nuculani7i(e 60 



Malletince 60 



♦XoiVco, to open or gape ; and mya. 



