MYA.— SCH.] 



LAMELLIBRANCHIA TA. 



701 



M. parvula, 1892, Cont. to Can. Pal., 



p. 296, Devonian. 

 Monotis is not an American palaeozoic 



genus. 

 Myalina trigonalis, Whiteaves, 1892, Cont. 



to Can. Pal., p. 294, Devonian. 

 Mytilarca inflata, Whiteaves, 1892, Cont. 



to Can. Pal. p. 293, Devonian. 

 Mytilops waverlyensis, Herrick, 1888, 



(Modiola waverlyensis,) Bull. Denison 



Univ., vol. 3, p. 63, Waverly Gr. 

 Nucula herzeri, Nettleroth, 1889, Ken- 

 tucky Foss. Shells, p. 221, Dp. Held. 



Gr. 

 manitobensis, Whiteaves, 



1892, Cont. to Can. Pal., 



p. 301, Devonian. 

 Nuculana similis, and N. 



spatulata, Herrick, 1888, 



Bull. Denison Univ., vol. 



3, p. 79, Waverly Gr. 

 Or.ecardia, Herrick, 1888, 



Ball. Denison Univ., vol. 



4, p. 41. [Ety. oraios, 

 produced at a fit season ; 

 kardia, heart.] Shell in- 

 equilateral, inequi valve, 

 ventricose, strongly curved, acute, ele- 

 vated beak, which inclines forward at the 

 apex ; hinge-line extended, produced 

 posteriorly, furnished with a thickened 

 ridge or cartilage plate ; the beaks are 

 separated from the hinge by a pseudo- 

 area which is elevated, and more or 

 less arched under the beak ; surface 

 marked with radiating lines. Type O. 

 ornata, which, with O. cornuta, is de- 

 scribed at the same place from the Wa- 

 verly Gr. 



Orthodesma minnesotense, O. saffordi, 

 Ulrich, 1892, 19th Rep. Geo. Sur. Minn., 

 pp. 228, 229, Trenton Gr. 



Orthonota corrugata, Whiteaves, 1890, 

 Trans. Roy. Soc. Can., vol. 8, p. 98, De- 

 vonian. 



Ostrea patercula, Winchell, in the opinion 

 of Whitfield, is from the Cretaceous of 

 New Jersey, which by some accident 

 was mixed with Waverly or Burling- 

 ton fossils. 



PaljEoneilo consimilis, P. curta, P. ignota, 

 Herrick, 1888, Bull. Denison Univ., 

 vol. 4, pp. 43, 44, Waverly Gr. 



Panenka is a Polish or Bohemian word, sig- 

 nifying the same as the Latin puella. 

 a little girl. It is not formed accord- 

 ing to the rules of nomenclature, and 

 should be discarded. 

 grandis, Whiteaves, 1891, Can. Rec. Sci., 

 p. 402, Corniferous Gr. 



Paracyclas elongata, and P. octerlonii, 

 Nettleroth, 1889, Kentuckv Foss. Shells, 

 pp. 210, 212, Up. Held. Gr. 



Pernopecten attenuatus, Herrick, 1887, 

 (Entolium attenuatum,) Bull. Denison 

 Univ., vol. 2, p. 24, Waverly Gr. 

 circulus, Shumard, 1885, (Avicula cir- 

 culus,) Geo. Rep. Mo., p. 206, Chouteau 

 limestone. 



Plethocardia, Ulrich, 1892, 19th Rep. Geo, 

 Sur. Minn., p. 243. [Ety. pletho, to be 

 full; kardia, heart.] Shell thin, oblique, 

 tumid, with the margins closed ; beaks 

 large, prominent, spirally enrolled, and 

 curving forward ; narrow, deep escutch- 

 eon posterior to the beaks ; bifid cardi- 

 nal tooth projects forward and down- 

 ward; single lateral tooth at the 

 posterior extremity of the hinge-line ; 

 anterior muscular scar deep at the 

 antero-dorsal angle, margined by a 

 curved ridge extending from the under 

 side of the cardinal tooth. Type P. 



Fig. 1259.— Plethocardia umbonata. 



umbonata, from the Trenton Gr., de- 

 scribed at the same place. P. sub- 

 erecta is also described from the Ga- 

 lena Gr. 



Posidonomya fragilis, Herrick, 1888, Bull. 

 Denison Univ., vol. 3, p. 39, Wa- 

 verly Gr. 



Promackus missouriensis, Swallow, 1860, 

 (Solen (?) missouriensis,) Trans.St.Louis 

 Acad. Sci., vol. 1, p. 655, Chouteau 

 limestone. It is not a Sanguinolites. 

 nasutus, Meek, 1871, (Sanguinolites 

 nasutus,) Am. Jour. Conch., vol. 7, 

 Chouteau limestone, 

 truncatus, Herrick, 1888, Bull. Denison 

 Univ., vol. 3, p. 60, Waverly Gr. 



Pterinea lobata, Whiteaves, 1892, Cont. to 

 Can. Pal., p. 292, Devonian. 



Pterinopecten ashlandensis, and P. cari- 

 niferus, Herrick, 1888, Bull. Denison 

 Univ. vol. 3, p. 58, and vol. 4, p. 33, 

 Waverly Gr. 

 sedaliensis, S. A. Miller, 1891, Advance 

 Sheets 17th Rep. Geo. Sur. Ind., p. 93, 

 Chouteau limestone. 



Pteronites obliquus, Herrick, 1888, Bull. 

 Denison Univ., vol. 3, p. 58, Wa- 

 verly Gr. 



Ptychoi'teria ;equivalvis, Whiteaves, 1891, 

 Cont. to Can. Pal., vol. 1, p. 239, De- 

 vonian, 

 mesocostalis, Williams, 1887, Bull. U. S. 



Geo. Sur., No. 41, p. 35, Portage Gr. 

 obsoleta, Simpson, 1889, Trans. Am. 

 Phil. Soc, p. 448, Chemung Gr. 



Sanguinolites missouriensis and S. nasutus 

 refer to Promacrus. 

 senilis, Herrick, 1888, Bull. Denison 

 Univ., vol. 3, p. 66, Waverly Gr. 



Schizodus affinis, Herrick, 1887, Bull. Deni- 

 son Univ., vol. 2. p. 41, Coal Meas. 

 harii, S. A. Miller, 1891, Advance Sheets 



