LAMELLIBRANCHIATA. 



195 



MoDioLOPsis, Hall, 1847, Pal. N. Y., vol. 1. 

 [Ety. Modiola, a genus of shells ; opsis, 

 appearance; from its resemblance to 

 Modiola.] 

 adrastia, Billings, 1862, Pal. Foss., vol. 1, 

 Black Riv. Gr. [Ety. mythological 

 name.] 

 anodontoides, Conrad, 1847,(Cypricardites 



anodontoides) Pal. N. Y., vol. 1, Hud. 

 Riv. Gr. [Ety. from its resemblance 



to the genus Anodonta.] 

 arcuata, Hall, 1847, Pal. N. Y., vol. 1, 



Trenton Gr. [Sig. bent, bow-shaped.] 

 aviculoides, Hall, 1847, Pal. N. Y., vol. 1, 



Trenton Gr. [Sig. resembling an 



Avicula.'j 

 carinata. Hall, 1847, Pal. N. Y., vol. 1, 



Trenton Gr. [Sig. keeled.] 

 cincinnatiensis, Hall & Whitfield, 1875, 



Ohio Pal., vol. 2, Cin'ti Gr. [Ety. 



proper name.] 

 concentrica, Hall & Whitfield, 1872, Ohio 



Pal., vol. 2, Cin'ti Gr. [Sig. concen- 

 tric] 

 curta. Hall, 1847, Pal. N. Y., vol. 1, Hud. 



Riv. Gr. [Sig. short.] 

 dicteus, Hall, 18G7, 20th Reg. Rep. N. Y., 



Niagara Gr. [Ety. mythological 



name.] 

 (?) dubia, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Sig. doubtful.] 

 exilis, Billings, 1874, Pal. Foss., vol. 2, 



Up. Sil. [Sig. slender.] 

 faba, Conrad, 1842, in Emmons' Geo. 



Rep. N. Y., Black Riv., Trenton and 



Hud. Riv. Gr. [Sig. a bean.] 

 gesneri, Billings, 1862, Pal. Foss., vol. 1, 



Trenton and Black Riv. Gr. [Ety. 



proper name.] 

 latus, see Cypricardites latus. 

 maia, Billings, 1862, Pal. Foss., vol. 1, 



Trenton Gr. [Ety. mythological 



name.] 

 meyeri, Billings, 1862, Pal. Foss., vol. 1, 



Trenton Gr. [Ety. proper name.] 

 modiolaris, Conrad, 1838, (Pterinea mod- 



iolaris) Ann. Geo. Rep. N. Y., Hud. 



Riv. Gr. [Sig. like a Modiola.'] 

 modioliformis, Meek & Worth en, 1868, 



Geo. Sur. 111., vol. 3, Trenton Gr. [Sig. 



like a Modiola.] 

 mytiloides, Hall, 1847, Pal. N. Y., vol. 1, 



Black Riv. & Trenton Gr. [Sig. like 



a shell of the genus Mylilus.'] 

 nais, Billings, 1862, Pal. Foss., vol. 1, 



Black Riv. Gr. [Ety. mythological 



name.] 

 nasuta, Conrad, 1841, (Cypricardites 



nasutus) Ann. Rep. N. Y., Trenton & 



Hud. Riv. Gr. [Sig. nasute.] 

 nuculiformis, seeTellinomya nuculiformis. 

 obtusa. Hall, 1847, Pal. N. Y., vol. 1, 



Birdseye Gr. . [Sig. obtuse.] 

 orthonota, Conrad, 1839, (Unio orthono- 



tus) Ann. Rep. N. Y., Medina sand 



stone. [Sig. straight-backed.] 



ortJumota, Meek & Worthen, 1868, Geo. 

 Sur. 111., vol. 3, Trenton Gr. This 

 name was preoccupied. 



ovata. Hall, 1852, Pal. N. Y., vol. 2, Clin- 

 ton Gr. [Sig. ovate.] 



parallela, Conrad, 1847, Pal. N. Y., vol. 1, 

 Trenton Gr. [Sig. parallel.] 



parviuscula, Billings, 1859, Can. Nat. & 

 Geo., vol. 4, Chazy Gr. [Sig. very 

 small.] 



perlata. Hall, 1876, 28th Reg. Rep. N. 

 Y., Niagara Gr. [Sig. very wide.] 



perovata, see Modiomorpha perovata. 



pholadiformis, Hall, 1851, Lake Sup. 

 Land Dist., vol. 2, Hud. Riv. Gr. 

 [Sig. like the PJiolas.] 



plana. Hall, 1861, Geo. Rep. Wis., Tren- 

 ton Gr. [Sig. smooth.] 



primigenia, Conrad, 1838, (Unio primi- 

 genius) Ann. Rep. N. Y., Medina 

 sandstone. [Sig. first-born.] 



recta, Hall, 1867, 20th Reg. Rep. N. Y., 

 Niagara Gr. [Sig. straight.] 



rhomboidea. Hall, 1860, Can. Nat. & Geo., 

 vol. 5, Up. Sil. [Sig. rhomboidal.] 



rudis, Billings, 1874, Pal. Foss., vol. 2, 

 Up. Sil. [Sig. rude.] 



striata, Billings, 1866, Catal. Sil. Foss. 

 Antic, Anticosti Gr. [Sig. striated.] 



subalata. Hall, 1852, Pal. N. Y., vol. 2, 

 Clinton & Niagara Gr. [Sig. some- 

 what winged.] 



subcarinata. Hall, 1852, Pal. N. Y., vol. 

 2, Clinton Gr. [Sig. somewhat cari- 

 nated.] 



subnasuta. Hall, 1860, Can. Nat. & Geo., 

 vol. 5, Up. Sil. [Sig. somewhat nasute.] 



subnasuta, Meek & Worthen, 1870. This 

 name was preoccupied. 



subspatulata, Hall, 1847. See Cypricar- 

 dites subspatulatus. 



superba. Hall, 1861, Geo. Rep. Wis., 

 Trenton Gr. [Sig. grand.] 



terminalis. Hall, 1847, Pal. N. Y., vol. 1, 

 Cin'ti Gr. [Sig. terminating.] 



trentonensis. Hall, 1847, Pal. N. Y., vol. 



1, Trenton Gr. [Ety. proper name.] 

 truncata. Hall, 1847, Pal. N. Y., vol. 1, 



Hud. Riv. Gr. [Sig. cut short.] 

 undulostriata. Hall, 1852, Pal. N. Y., vol. 



2, Niagara Gr. [Sig. having waved 

 striae.] 



varia, Billings, 1874, Pal. Foss., vol. 2, 



Low. Held. Gr. [Sig. different.] 

 versaillesensis, S. A. Miller, 1874, Cin. 



Quar. Jour. Sci., Cin'ti Gr. [Ety. 



proper name.] 

 Modiomorpha, Hall, 1870, Prelim. Notice 



Lam. shells. [Ety. contracted from 



Modiola, a genus of shells; morphef 



form.] 

 alta, Conrad, 1841, (Cypricardites alta) 



Ann. Rep. N. Y., Ham. Gr. [Ety. 



from the elevation of the hinge 



margin.] 

 alata. Hall, 1843, (Cypricardites alata) 



Geo. Rep. N. Y., Chemung Gr. [Sig. 



winged.] 



