266 BULLETIN NO. 30, UNITED STATES NATIONAL MUSEUM. 



Page. 



LAMELLIBRANCHIATA. 



Section n. — Lamellibranchiate Shells from the Plastic Clay; 



Astartidce. 



Astarle, Sowerby 23 



A. reta, Conrad, pi. ii, fig. 1 23-24 



Oyprtnidee. 



Ambonicardia, n. g., "Whitfleld, 1885 24-25 



A. cookii, n.s., "Whitfield, 1885, pL ii, flgs. 11-14 25 



Gorbicula, Megerle 26 



0.? emacerata, n.s., Whitfield, 1885, pi. ii, flgs. 5, 6 26 



O. annosa, Conrad, pi. ii, flga. 2-4 26-27 



Chnathodon 27 



GJ tenuidens, n. s., Whitfield, 1885, pLii, figs. 7-10 27-28 



Section III. — Lamellibranchiata from the Lower Marl Beds. 

 Integripalliata. 

 Asiphonida. 

 Monomyaria. 



Ostreidat. 



Ostrea, Linn 29 



O. denticulifera, Conrad, pi. iii, fla. 8, 9 . , 29 



O. crenulimarginata, Gabb, pi. iii, figs. 10, 11 30 



O. panda, Morton 30 



O.plumosa, Morton, pi. iii, figs. 12, 13 31-32 



O. aubspatulata, L. & Sow., 1845, pi. iii, fig. 14 32-33 



O. tecticosta, Gabb, pi. iii, figs. 1, 2 33-34 



O. larva, Lamarck, pi. iii, flgs. 3, 7 34-36 



Gvyphcea, Lam 36 



O. vesicularis. Lam. 'i (1806), pi. iii, flgs. 15, 16; pi. iv, flgs. 1-3 ; and pi. v 36-39 



Exugyra, Say 39 



E.costata, S.av, pi. vi, figs. 1,2 39-41 



Anoiniidce. 



Anomia, Linn „ 42 



A. argentaria, Morton, pi. iv, flgs. 9-11 42 



A. tellinoides, Morton, pi. iv, flgs. 12, 13 43 



Diplonchiza, Conrad, 1866 43 



D. cretacea, Conr.-^d , pi. iv, figs. 4-8 43-44 



Paranoinia, Conrad, 1860 44 



P.ecahra, Morton, pi. x, fig. 10 44 



P. lineata, Conrad, pi. ix, fig. 10 45 



Pecten, Kloin 45 



P. venustus, Mort., pi. vii, figs. 1-4 45-46 



P. quinquenariuK, Conrad, 1854, pi. vii, figs. 13-16 , 47 



P. tenuitestus, Gabb, 1861, pi. vii, figs. 5,6 47-48 



P. planicostatus, n. s., Whitfield, 1885, pL viii, flgs. 10,11 48-49 



P. (Ohlamys) cratlcidus, Morton, pi. vii, flgs. 17, 18 49-50 



P. iSyncyclonema ?) perlamellosus, pi. vii, fig. 7 _ 50-51 



Amunum, Klein 51 



A. simplicmn, Conrad, pi. vii, flgs. 11, 12 51-52 



A. conradi, n.s., Whitfield, 188.5, pi. vii, figs. 8-10 52-53 



Oaynptonectes (Amusium) burlingUmenns, Gabb, pi. viii, figs. 3-9 53-55 



Camptonectes parvus, n. s., Whitfield, 1885, pi. viii, figs. 1, 2 _ 55 



• Neithea, Drouct 56 



N. qxdnquecostata (Sowerby) , pi. viii, figs. 12-14 - 56-57 



Spondylidce. 



Spondylus, Lam 57 



S. gregalis, Morton, pi. ix, figs. 11, 12, and pi. x, flgs. 1, 2 ~ 57-58 



Dianchora, Sowerby 58-59 



D. echinata, Morton, pi. x, flgs. 3-9 59-60 



Plicatula, Liim , 61 



P.urticosa, Mort<m, pi. ix, flgs. 1,2 61 



Itadtila. Klein 61 



R. pelagica, Morton, pi. ix, flgs. 3-5 61-62 



R. acutilineata, Conrad, pi. ix, flgs, 6,7 ^ 62-63 



B.reticulata, Lyell & Forbes, 1845, pi. ix, flgs. 8,9 ^ e»-fl4 



