CYR.— CYT.] 



LAMELUBRANCHIA TA. 



47T 



iowensis, Owen, 1840, (Cardium iowense,) 



Rep. on Mineral lands, pi. 17, fig. 8, 



Calciferous Gr. 

 latus, Hall, 1847, (Modiolopsis latus,) Pal. 



N. Y., vol. 1, p. 160, Trenton Gr. 

 lencothea, Billings, 1862, (Cyrtodonta 



leucothea,) Pal. Foss., vol. 1, p. 46, Black 



Riv. Gr. 

 marcellensis, see Lunulicardium marcel- 



lense. 

 megambonus, Whitfield, 1878, Ann. Rep. 



Geo. Sur. Wis., p. 73, and Geo. Wis., 



vol. 4, p. 210, Trenton Gr. 

 modiolaris, Emmons, syn. for Modiolopsis 



nasnta. 

 mytiloides, see Modiomorpha mytiloides. 

 nasutus, see Modiolopsis nasuta. 

 niota, Hall, 1861, Geo. Rep. Wis., p. 29, 



and Geo. Wis., vol. 4, p. 208, Tren- 

 ton Gr. 

 obliquus, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3, p. 311, Galena Gr. 

 oblongus, Conrad, syn. for Modiomorpha 



concentrica. 

 obsoletus, Hall, 1843, (Cypricardia obso- 



leta,) Geo. Rep. 4th Dist. N. Y., pi. 8, 



fig. 3, Clinton Gr. 

 obtusus, Hall, 1847, (Ambonychia ob- 



tusa,) Pal. N. Y., vol. 1, p. 167, Black 



Riv. and Trenton Gr. 

 ovata, syn. for Modiolopsis modiolaris. 

 plebeius, Billings, 1866, (Cyrtodonta ple- 



beia.) Catal. Sil. Foss., Antic, p. 14, 



Hud. Riv. Gr. 

 ponderosus, Billings, 1862, (Cyrtodonta 



ponderosa,) Pal. Foss., vol. 1, p. 150, 



Hud. Riv. Gr. 

 quadrangularis, Whitfield, 1878, Jour. 



Cin. Soc. Nat. Hist., vol. 1, p. 138, Hud. 



Riv. Gr. 

 quadrilateralis, Hall, 1867, 20th Rep. N. Y. 



Mus. Nat. Hist., p. 388, Niagara Gr. 

 radiatus, Conrad, 1841, Ann. Rep. N. Y., 



p. 53, Ham. Gr. Not recognized, 

 rectus, Conrad, 1841, Ann. Rep. N. Y., p. 



52, Up. Held. Gr. 

 rectirostris, Hall, 1861, Geo. Rep. Wis., p. 



29, Trenton Gr. 

 recurvus, see Cimitaria recurva. 

 rotundatus, Hall, 1861, Geo. Rep. Wis., 



p. 29, and Geo. Wis., vol. 4, p. 208, 



Trenton Gr. 

 rugosus, Billings, 1858, (Cyrtodonta ru- 



gosa,) Can. Nat. and Geo., vol. 3, p. 432, 



Black Riv. Gr. 

 rugosus, see Goniophora rugosa. 

 saffordi, Hall, 1852, (Palsearca saffordi,)12th 



Rep. N. Y. Mus. Nat. Hist., p. 11, and 



Geo. of Tenn., p. 287, Low. Held. Gr. 

 sectifrons, see Phthonia sectifrons. 

 sigmoideus, Billings, 1858, (Cyrtodonta 



sigmoidea,) Can. Nat. and Geo., vol. 3, 



p. 438, Black Riv. Gr. 

 sinuatus, see Modiolopsis sinuata. 

 spiniferus, Billings, 1858, (Cyrtodonta spi- 



nifera,) Can. Nat. and Geo., vol. 3, p. 



435, Black Riv. Gr. 

 sterlingensis, Meek & Worthen, 1866, 



(Dolabra sterlingensis,) Proc. Acad. 



Nat. Sci. Phil., p. 260, and Geo. Sur. 

 111., vol. 3, p. 339, Hud. Riv. Gr. 



subalatus, see Modiomorpha subalata. 



subangulatus, Hall, 1847, (Edmondia sub- 

 angulata,) Pal. N. Y., vol. 1, p. 156, 

 Black Riv. and Trenton Grs. 



subcarinatus, Billings, 1858, (Cyrtodonta 

 subcarinata,) Can. Nat. and Geo., vol. 

 3, p. 433, Black Riv. Gr. 



subspatulatus, Hall, 1847, (Modiolopsis- 

 subspatulata,) Pal. N. Y., vol. 1, p. 159, 

 Black Riv. and Trenton Grs. 



truncatus, see Sphenotus truncatus. 



ungulatus, Billings, 1866, (Cyrtodonta un- 

 gulata,) Catal. Sil. Foss. Antic, p. 15 r 

 Hud. Riv. Gr. 



ventricosus, Hall, 1847, (Edmondia ven- 

 tricosa,) Pal. N. Y., vol. 1, p. 155, Tren- 

 ton Gr. 



ventricosus, Hall, 1859, (Palsearca ventri- 

 cosa,) Pal. N. Y., vol. 3. This name 

 was preoccupied. See Cypricardites is- 

 landicus. 



vetustus, Hall, 1847, (Cardiomorpha ve- 

 tusta,) Pal. N. Y., vol. 1, p. 154, Tren- 

 ton Gr. 



winchelli, Safford, 1869, (Cyrtodonta win- 

 chelli,) Geo. Tenn., p. 287, Trenton and 

 Hud. Riv. Grs. 

 Cyrtodonta, syn. for Cypricardites. 



acutumbona, see Cypricardites acutum- 

 bonus. 



anticostiensis, see C. anticostiensis. 



breviuscula, see C. breviusculus. 



canadensis, see C. canadensis. 



cordiformis, see C. cordiformis. 



emma, see C. emma. 



ganti, see C. ganti. 



harrietia, see C. harrietta. 



hayniana, see C. haynanus. 



hindi, see C. hindi. 



huronensis, see C. huronensis. 



insularis, see C. insularis. 



leucothea, see C. leucothea. 



normanensis, Safford. Not defined. 



plebeia, see Cypricardites plebeius. 



ponderosa, see C. ponderosus. 



rugosa, see C. rugosus. 



saffordi, see C. saffordi. 



sigmoidea, see C. sigmoideus. 



spinifera, see C. spiniferus. 



subcarinata, see C. subcarinatus. 



ungulata, see C. ungulatus. 



winchelli, see C. winchelli. 

 Cytherodon, Hall & Whitfield, 1873, in 23d 

 Rep. N. Y., pi. 14, figs. 19-21. [Ety. 

 Cy there, a. genus; odous, tooth.] Ovate, 

 pointed posteriorly ; beaks pointed - r 

 sharp, oblique, umbonal ridge ; cardinal 

 line short ; subcircular anterior and 

 posterior muscular scars distinct ; hinge 

 area strong with angular teeth or crenu- 

 lations beneath the beaks, pallial line 

 simple, surface concentrically lined. 

 Type C. nasutus. 



appressus, Conrad, (Nuculites appressus,) 

 1842, Jour. Acad. Nat. Sci., vol. 8, p. 

 248, and Pal. N. Y., vol. 5, pi. 75, figs. 

 3-9, Ham. Gr. 



