LAMELLIBRANCHIATA. 



199 



recta, Hall, 1870, Prelim. Notice Lam. 



shells. Ham. Gr. [Sig. from the 



straight umbonal ridge.] 

 subalata. Hall, 1870, Prelim. Notice Lam. 



shells. Ham. Gr. [8ig. somewhat 



winged.] 

 Opistfioptera, Meek. Not defined. 

 Oktiiodesma, Hall & Whitfield, 1875, Ohio 



Pal., vol. 2. [Ety. orthos, straight; 



desma, a ligament.] 

 contractum, Hall, 1847, (Orthonota con- 



tracta) Pal. N. Y., vol. 1, Hud. Riv. 



Gr. [Sig. contracted.] 

 curvatum. Hall & Whitfield, 1875, Ohio 



Pal., vol. 2, Cin'ti Gr. [Sig. curved.] 

 parallelum, Hall, 1847, (Orthonota paral- 



lela) Pal. N. Y., vol. 1, Hud. Riv. Gr. 



[Sig. parallel.] 

 rectum. Hall & Whitfield,1875, Ohio Pal., 



vol. 2, Cin'ti Gr. [Sig. straight.] 

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



[Ety. orthos, straight; notos, the back.] 

 angulifera, (?) McCoy, 1850, Brit. Pal. 



Rocks, Up. Sil. [Sig. having angles.] 

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



Ham. Gr. [Sig. keeled.] 

 conlracta, see Orthodesma contractum. 

 curta, Hall, 1843, Geo. Rep. 4th Dist. N. 



Y., Clinton and Niagara Gr. [Sig. 



short.] 

 ensiformis. Hall, 1870, Prelim. Notice 



Lam. shells, Ham. Gr. [Sig. ensi- 



form.] 

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



Up. Sil. [Sig. doubtful.] 

 parallefa, see Orthodesma parallelum. 

 parvula, Hall, 1870, Prelim. Notice Lam. 



shells. Ham. Gr. [Sig. very small.] 

 phaselia, Winchell, 1863, Proc. Acad. 



Nat. Sci., Chemung Gr. [Sig. a kid- 

 ney bean.] 

 pholadis, (Conrad, 1838, (Pterinea phola- 



dis) Ann. Geo. Rep. N. Y., Hud. Riv. 



Gr. [Sig. like a shell of the genus 



Pholas.] 

 rectidorsalis, Winchell, 1862, Proc. Acad. 



Nat. Sci., Marshall Gr. [Sig. straight- 

 backed.] 

 siliquoidea, Hall, 1870, Prelim. Notice 



Lam. shells, Ham. Gr. [Sig. like a 



pod.] 

 simulans, Billings, 1874, Pal. Foss., vol. 



2, Up. Sil. [Sig. resembling.] 

 (?) speciosa, Billings, 1874, Pal. Foss., 



vol. 2, Up. Sil. [Sig. beautiful.] 

 undulata, Conrad, 1841, Ann. Rep. N. 



Y., Ham. Gr. [Sig. wavy.] 

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



Up. Sil. [Sig. elegant.] 

 OsTREA, Linnaeus, 1758, Syst. Nat., 10th ed. 



[Ety. ostrea, an oyster.] 

 patercula, Winchell, 1865, Proc. Acad. 



Nat. Sci., Burlington Gr. [Ety. proper 



name.] 

 Palxarca, syn. for Cypri cardites. 

 saffordi, see Cypricardites saffordi. 

 vcntricosaj see Cypricardites ventricosus 



Pal^ocardia, Hall, 1867, 20th Reg. Rep. N. 



Y. [Ety. palmris, ancient; karaia, a 



heart.] 

 cordiformis, Hall, 1867, 20th Reg. Rep. N. 



Y., Niagara Gr. [Sig. heart-shaped.] 

 PAL.KONEILO, Hall, 1870, Prelim. Notice Lam. 



shells. [Ety. palaios ancient ; Neilo, a 



genus of shells.] 

 attenuata. Hall, 1870," Prelim. Notice Lam. 



shells, Waverly Gr. [Sig. attenuated.] 

 barrisi. White & Whitfield, 1862, (Leda 



barrisi) Proc. Bost. Soc. Nat. Hist., 



vol. 8, Kinderhook Gr. [Ety. proper 



name.] 

 bedfordensis. Meek, 1875, Pal. Ohio, vol. 



2, Waverly Gr. [Ety. proper name.] 

 bisulcata. Hall, 1870, Prelim. Notice Lam. 



shells, Ham. Gr. [Sig. double-sul- 



cated.] 

 brevis. Hall, 1870, Prelim. Notice Lam. 



shells, Chemung Gr. [Sig. short.] 

 carbonaria, see Yoldia carbonaria. 

 constricta, Conrad, 1842, (Nuculites con- 



stricta) Jour. Acad. Nat. Sci., vol. 8, 



Chemung Gr. [Sig. constricted.] 

 emarginata, Conrad, 1841, (Nuculites 



emarginata) Ann. Rep. N. Y., Ham. 



Gr. [Sig. emarginated.] 

 filosa, Conrad, 1842, (Nuculites filosa) 



Jour. Acad. Nat. Sci., vol. 8, Chemung 



Gr, [Sig. thready.] 

 fcecunda. Hall, 1870, Prelim. Notice Lam. 



shells. Ham. Gr. [Sig. abundant.] 

 maxima, Conrad, 1841, (Nuculites max- 

 ima) Ann. Rep. N. Y., Ham. Gr. [Sig. 



the largest.] 

 muta. Hall, 1870, Prelim. Notice Lam. 



shells, Ham. Gr. [Sig. inconspicuous.] 

 parallela, Hall, 1870, 23rd Reg. Rep. N. 



Y., Waverly Gr. [Sig. parallel.] 

 perplana, Hall, 1870, Prelim. Notice Lam. 



shells. Ham. Gr. [Sig. very flat.] 

 plana, Hall, 1870, Prelim. Notice Lam. 



shells. Ham. Gr. [Sig. flat.] 

 tenuistriata. Hall, 1870, Prelim. Notice 



Lam. shells. Ham. Gr. [Sig. fine- 

 lined.] 

 Pal^anatina, Hall, 1870, Prelim. Notice 



Lam. shells. [Ety. palaios, ancient; 



Anatina, a genus of shells.] The 



family name at the head of this class 



should be spelled PaUcanatinidx in- 

 stead of Palanatinidie. 

 quadrate. Hall, 1877, Pal. N. Y., vol. 5, 



Chemung Gr. [Sig. quadrate.] 

 typus, Hall, 1870, Prelim. Notice Lam. 



shells, Chemung Gr. [Ety. the type 



of the genus.] 

 Panopxa, Menard de la Groye, 1807, Ann. 



du Mus. 9. [Ety. mythological name.] 

 cooperi, see Chaenomya cooperi. 

 Paracyclas, Hall, 1843, Geo. Rep. 4th Dist. 



N. Y. [Ety. para, allied to ; Cyclas, a 



genus of shells.] 

 elliptica, Hall, 1843, Geo. Rep. 4th Dist. 



N. Y., Cornif. Gr. [Sig. elliptical,] 



