486 



LAMELLIBRANC1HA TA. 



[LIM. LUN. 



topekensis, see Sedgwickia topekensis. 



undulatus, Whitfield, 1878, Ann. Rep. Geo. 

 Sur. Wis, p. 81, and Geo. Wis., vol. 4, 

 p. 293, Niagara Gr. 



mainensis, Billings, 1863, Proc. Port. Soc. 

 Nat. Hist., vol. 1, p. 118, Low. Held. Gr. 



pembrokensis, Billings, 1863, Proc. Port. 

 Soc. Nat. Hist., vol. 1, p. 118, Low. 

 % Held. Gr. 



percingulatus, Billings, 1863, Proc. Port. 

 Soc. Nat. Hist., vol. 1, p. 119, Low 

 Held. Gr. 



Lima, Brugueire, 1791, Encycl. Meth. and 

 Deshayes, 1824, Descrip. de Coqnilles 

 fossiles des environs de Paris. [Ety. 

 lima, a file.l Not a Palaeozoic genus. 



chesteremis, Worthen, not recognized. 



glabra, see Crenipecten glaber. 



macroptera, see Limoptera macroptera. 



obsoleta, see Crenipecten obsoletus. 



retifera, see Crenipecten retiferus. 



rugcestriata, see A viculopecten rugistriatus. 

 LIMOPTERA. Hall, 1870, Prelim. Notice Lam. 

 Shells,' p. 15, Up. Held. Gr. [Ety. 

 Lima, a genus ; pteron, a wing.] Large, 

 inequi valve, inequilateral, subquadrate, 

 alate posterior, auriculate anterior ; 

 ligamental area large, common, longi- 

 tudinally striate ; hinge with an ob- 

 lique posterior tooth and cardinal folds 

 beneath the fceak ; anterior impression 

 deep, posterior large, pallia! line simple 

 formed of a series of small pits ; inter- 

 pallial area pitted for the attachment 

 of umbonal muscles ; test radiated. 

 Type L. pauperata. 



cancellata, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 16, and Pal. N. Y., vol. 5, pt. 

 1, p. 244, Ham. Gr. 



curvata, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 18, and Pal. N. Y., vol 5, pt. 

 1, p. 250, Ham. Gr. 



FIG. 840. Limoptera macroptera. 



macroptera, Conrad, 1838, (Lima macrop- 

 tera,) Ann. Rep. N. Y., p. 117, and Pal. 

 N. Y., vol. 5, pt. 1, p. 246, Ham. Gr. 



obsoleta, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 18, and Pal N. Y., vol. 5, pt. 

 1, p. 249, Ham. Gr. 



pauperata, Hall, 1870, Prelim. Notice 

 Lam. Shells, p. 16, and Pal. N. Y., vol. 

 5, pt. 1, p. 243, Up. Held. Gr. 



earmenticia, Walcott, 1885, Monogr. U. S. 

 Geo. Sur., vol. 8, p. 167, Devonian. 



LITHOPHAGA, Lamarck, 1812, Hist. An. sans 

 Vert. [Ety. lithos, stone ; phago, I eat.] 

 Not American Palaeozoic. 



illinoisensis, Worthen, 1882, Bull. No. 1, 

 111. St. Mus. Nat. Hist., p. 38, Keokuk 

 Gr. Proposed instead of the form 

 identified as L. lingualis of Phillips. 



lingualis, Phillips, 1836, (Modiola lin- 

 gualis,) Geol. Yorkshire, vol. 2, p. 209. 

 Not American. 



pertenuis, Meek & Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil., p. 245, and Geo. 

 Sur. 111., vol. 5, p. 539, St. Louis Gr. 

 Littorina wheeleri, see Schizodus wheeleri. 

 Lucina, Bruguiere, 1792, Encyclop. Meth. 

 [Ety. mythological name.] Type L. 

 pennsylvanica. Notan American Palaeo- 

 zoic genus. 



billingsana, see Paracyclas billingsana. 



elliptica, see Paracyclas elliptica. 



elliptica vur. occidentalis, see Paracyclas 

 elliptica yar. occidentalis. 



hamiltonensis, see Paracyclas hamiltonensis. 



lirata, see Paracyclas lirata. 



occidentalis, Billings, 1859, Assiniboine and 

 Saskatchewan Ex. Exped. This name 

 was preoccupied by Morton for an 

 Eocene species, see Paracyclas bill- 



ohioensis, see Paracyclas ohioensis. 



retusa, see Paracyclas retusa. 



varysburgia, see Paracyclas varysburgen- 

 sis. 



wyomingensis, see Paracyclas wyoming- 



ensis. 



LUNULICARDIUM, Munster, 1840, Beitrage zur 

 Petrefaktenkunde, 3d heft, p. 69. [Ety. 

 lunula, a little moon ; Cardium, a genus.] 

 Equivalve, inequilateral, subelliptical, 

 subcircular, or trigonal ; posterior side 

 obliquely truncate, margin often re- 

 flexed and produced; beaks pointed; 

 cardinal line marked by a lunate hiatus ; 

 surface radiated and concentrically 

 marked ; ligament external. 



acutirostrum, syn. for L. ornatum. 



FIG. 841. Lunulicardium curtuin. 



curtum, Hall, 1884, Pal. N. Y., vol. 5, pi. 71, 

 figs. 18-23, Up. Held. Gr. 



