LEP] 



LAMELLIBRANCHIA TA. 



485 



flaccidum, Hall, 1884, Pal. N. Y., vol. 5, 



pt. 1, p. 225, Chemung Gr. 

 hector, Hall, 1884, Pal. N. Y., vol.5,pt. 1, 



p. 209, Chemung Gr. 



jason, Hall, 1884, Hall, Pal. N. Y., vol. 5, 

 pt. 1, p. 213, Chemung Gr. 



liopteroi des, 

 Simpson, 1889, 

 Diet, of Pa. 

 Foss., p. 331, 

 Chemung Gr. 

 lepidum. Hall, 

 1884, Pal. N.Y., 

 vol. 5, pt. 1, p. 

 195, Chemung 



FIG. 837. Leptodesma 

 hector. 



Gr. 



FIG. 838. Leptodesma 

 hector. 



lesleyi, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 223, Up. Chemung Gr. 

 lichas, Hal 1, 1884, 



Pal. N. Y., vol. 



5. pt. 1, p. 232, 



Chemung Gr. 

 longi sp in u m , 



Hall, 1843, 



(Avicula lon- 



gi.spina,) Geo. 



Rep. 4th Dist. 



N. Y., p 262, 



and Pal. N. Y., vol. 5, pt. 1, p. 179, 



Chemung Gr. 

 loxias, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 



p. 204, Chemung Gr. 

 lysander. Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 216, Chemung Gr. 

 maclurii, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 228, Chemung Gr. 

 marcellense, Hall, 1884, Pal. N. Y., vol. 



5, pt. 1, p. 175, Marcellus Shale, 

 matberi, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 193, Cnemung Gr. 

 medon, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 197, Chemung Gr. 

 mentor, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 205, Chemung Gr. 

 mortoni, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 190, Chemung Gr. 

 mytiliforme, Hall, 1884, Pal. N. Y., vol. 5, 



pt. 1, p. 2)35, Cuemung Gr. 

 naviforme, Hall, 1884, Pal. N. Y., vol. 5, 



pt. 1, p. 200, Chemung Gr. 

 nereus, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 217, Chemung Gr. 

 orcus, Hall, 1884, Pdl. N. Y., vol. 5, pt. 



1, p. 215, Chemung Gr. 

 erodes, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 206, Up. Chemung Gr. 

 orus, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 



p. 219, Cheraung Gr. 

 parallela, Simpson, 1889, Diet, of Pa. 



Foss., p. 332, Chemung Gr. 

 patulum, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 226, Chemung Gr. 

 pelops Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 



p. 214, Up. Chemung Gr. 

 phaon, Hall. 1884, Pal. N. Y., vol. 5, pt. 



1, p. 230, Chemung Gr. 

 potens, Hill, 1884, Pal. N. Y., vol. 5, pt.l, 



p. 188, Up. Chemung Gr. 



potens var. juvene, Hall, 1884, Pal. N. Y., 

 vol. 5, pt. 1, p. 189, Chemung Gr. 



propinquum, Hall, 1884, Pal. N. Y., vol. 

 5, pt. 1, p. 231, Chemung Gr. 



protextum, Conrad, 1842, (Avieula pro- 

 texta,) Jour. Acad. Nat. Sci. Phil., vol. 

 8, p. 238, and Pal. N. Y., vol. 5, pt. 1, 

 p. 183, Chemung Gr. 



quadratum, Hall, 1884, Pal. N. Y., vol^>, 

 pt. 1, p. 233, Chemung Gr. 



robnstum, Hall, 1884, Pal. N. Y., vol. 5, 

 pt. 1, p. 181, Chemung Gr. 



rogersi, Hall, 1884, Pal. N. Y., vol. 5, pt. 

 1, p. 176, Ham. Gr. 



rude, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 

 p. 221, Chemung Gr. 



shumardi, Hall, 1884, Pal. N. Y., vol. 5, 

 pt. 1, p. 180, Chemung Gr. 



soeiale, Hall, 1884, Pal. N. Y., vol. 5, pt. 

 1, p. 187, Chemung Gr. 



spinigerum, Conrad, 1842, (Avicula spi- 

 nigera,) Jour. Acad. Nat. Sci. Phil., vol. 

 8, p. 237, and Pal. N. Y., vol. 5, pt. 1, 

 p. 177, Chemung Gr. 



stephani, Hall, 1884, Pal. N. Y., vol. 5, pt. 

 1, p. 194, Up. Chemung Gr. 



transversum, Walcott, 1885, Monogr. U. S. 

 Geo. Sur., vol. 8, p. 167, Chemung Gr. 



truncatum, Hall, 1884, Pal. N. Y., vol. 5, 

 pt. 1, p. 211, Chemung Gr. 



umbonatum, Hall, 1884, Pal. N. Y., vol.5, 

 pt. 1, p. 198, Chemung Gr. 



umbonatum var. depressum, Hall, 1884, 

 Pal. N. Y., vol. 5, pt. 1, p. 199, Che- 

 mung Gr. 



LEPTODOMUS, McCoy, 1844, Synopsis Garb. 

 Foss. Ireland, p. 66. [Ely. leptos, slender; 

 domw, house.] Shell thin, short, ob- 

 long, tumid, subequivalve, inequilat- 

 eral ; beaks large, incurved ; anterior 

 side short, obtusely rounded, slightly 

 gaping ; deep ovate lunette between the 

 beaks ; posterior end broad, rounded, 

 gaping, slope compressed, sides sulcated 

 parallel with the ventral margin ; dorsal 

 margin inflected so as to form a lunette 

 as long as the hinge-line ; np hinge 

 teeth ; muscular impressions faint. 



arata, Hall, 1860, Can. Nat. and Geo., vol. 

 5, p. 152, Up. Silurian. 



32 



Fio. 839. Leptodomus canadensis, 



canadensis, tJillings, 1874, Pal. Foss., vol. 

 2, p. 54, Gaspe limestone No. 8, De- 

 vonian. 



clavata, Winchell, 1862, Proc. Acad. Nat. 

 Sci., p. 415, Portage Gr. 



granosus, see Allorisina granosum. 



