194 



LAMELLIBRANCHIATA. 



M acrodon, Lycett, 1845, Murch. Geo. Chelt. 

 [Ety. macros, long; odous, a tooth.] 



carbonarius, Cox, 1857, (Area carbona- 

 rius) Geo. Sur. Ky., vol. 3, Coal Meas. 

 [Sig. pertaining to coal.] 



chemungensis, Hall, 1870, Prelim. Notice 

 Lam. Shells, Chemung Gr. [Ety. 

 proper name.] 



cochlearis, Winchell, 1863, Proc. Acad. 

 Nat. Sci., Chemung Gr. [Sig. spoon- 

 shaped.] Prof. Hall suggests that it is 

 a syn. for M. parvus. 



curtus, Dawson, 1868, Acad. Geol., Carb. 

 [Sig. short.] 



delicatus, Meek & Worthen, 1870, Proc. 

 Acad. Nat. Sci., Coal Meas. [Sig. 

 delicate.] 



hamiltonise, Hall, 1870, Prelim. Notice 

 Lam. shells, Ham. Gr. [Ety. proper 

 name.] 



hardingi, Dawson, 18 68, Acad. Geol., 

 Carb- [Ety. proper name.] 



micronema, Meek & Worthen, 1866, 

 Proc. Acad. Nat. Sci., Chester Gr. 

 [Sig. a small thread.] 



obsoletus, Meek, 1871, Reg. Rep. Univer- 

 sity W. Va., Coal Meas. [Sig. ob- 

 solete.] 



ovatus, Hall, 1870, Prelim. Notice Lam. 

 shells, Waverly Gr. [Sig. ovate.] 



parvus, White & Whitfield, 1862, Proc. 

 Bost. Soc. Nat. Hist., vol. 8, Kinder- 

 hook Gr. [Sig. small.] 



shubenacadiensis, Dawson, 1868, Acad. 

 Geo., Carb. [Ety. proper name.] 



tenuistriata, Meek & Worthen, 1867, Proc. 

 Acad. Nat. Sci., Coal Meas. [Sig. fine- 

 lined.] 

 Matheria, Billings, 1858, Can. Nat. & Geo., 

 vol. 3. [Ety. proper name.] 



tenera, Billings, 1858, Can. Nat. & Geo., 

 vol. 3, Trenton Gr. [Sig. tender, del- 



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



[Ety. megale, great ; omos, shoulder.] 

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



Guelph Gr. [Ety. proper name.] 

 Megambonia, Hall, 1859, Pal. N. Y., vol. 3. 



[Ety. mega, great; ambon, the boss of 



a shield.] 

 aviculoidea, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Sig. like an Avicula.] 

 bellistriata, Hall, 1859, Pal. N. Y., vol. 3, 



Oriskany sandstone. [Sig. beautifully 



striated.] 

 cancellata,-Hall, 1860, Can. Nat. & Geo., 



vol. 5, Silurian. [Sig. cancellated.] 

 cardiiformis, Hall, 1843, (Pterinea cardii- 



formis) Geo. Rep. 4th Dist. N. Y., 



Cornif. Gr. [Sig. like a Cardium.~\ 

 cordiformis, see Mytilarca cordiformis. 

 jamesi, Meek, 1872, Proc. Acad. Nat. Sci. 



Phil., Cin'ti Gr. [Ety. proper name.] 



This shell probably belongs to the 



genus Ambonychia. 

 lamellosa, Hall, 1859, Pal. N. Y., vol. 3, 



Oriskany sandstone. [Sig. made of 



thin plates.] 



lata, Hall, 1859, Pal. N. Y., vol. 3, Low. 



Held. Gr. [Sig. wide, expanded on 



the posterior slope.] 

 lyoni, syn. for Cardiopsis radiata. 

 mytiloidea, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Sig. like the MytUm.l 

 oblonga, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Sig. oblong.] 

 obscura, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Sig. characters ob- 

 scure.] 

 ovata, syn. for Mytilarca mytilimeris. 

 ovoidea, Hall, 1859, Pal. N. Y., vol. 3, Low. 



Held. Gr. [Sig. ovoidal.] 

 rhomboidea, Hall, 1859, Pal. N. Y., vol. 



3, Low. Held. Gr. [Sig. rhomboidal ] 

 spinneri, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Ety. proper name.] 

 ' striata, Hall, 1860, Can. Nat. & Geo., vol. 



5, Silurian. [Sig. striated.] 

 subcordiformis, Hall, 1877, Pal. N. Y., 



vol. 5, Up. Held. Gr. [Sig. some- 

 what like M. cordiformis.] 

 suborbicularis, Hall, 1859, Pal. N. Y., vol. 



3, Low. Held. Gr. [Sig. somewhat 



orbicular.] 

 Megaptera, Meek & Worthen, 1866. The 



name was preoccupied. 

 Microdon, Conrad, 1842, Jour. Acad. Nat. Sci., 



vol. 8. This name was applied by 



Agassiz to a genus of fish in 1833, and 



was also preoccupied for a genus of 



insects. 

 bellistriata, Conrad, 1842, Jour. Acad. Nat. 



Sci., vol. 8, Ham. Gr. [Sig. beautifully 



lined.] 

 complanatus, Hall, 1870, Prelim. Notice 



Lam. shells, Ham. Gr. [Sig. smoothed.] 

 gregaria, Hall, 1870, Prelim. Notice Lam. 



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

 reservatus, Hall, 1870, Prelim. Notice Lam. 



shells, AVaverly Gr. [Sig. preserved.] 

 tenuistriata, Hall, 1870, Prelim. Notice 



Lam. shells, Ham. Gr. [Sig. finely 



lined.] 

 Modiola, Lamarck, 1801, Syst. An. sans 



Vert. [Ety. modiolus, a small measure 



or drinking vessel.] 

 avonia, Dawson, 1868, Acad. Geol., Low. 



Carb. [Ety. proper name.] 

 concentrica, see Modiomorpha concentrica. 

 lingualis, see Lithoj)haga lingualis. 

 metella, Hall, 1870, Prelim. Notice Lam. 



shells, Chemung Gr. [Ety. proper 



name.] 

 minor, Lea, 1852, Jour. Acad. Nat. Sci., 



2nd series, vol. 2, Coal Meas. [Sig. 



less.] 

 obtusa, see Modiolopsis obtusa. 

 pooli, Dawson, 1868, Acad. Geol., Low. 



Carb. [Ety. proper name.] 

 prsecedens, Hall, 1870, Prelim. Notice 



Lam. shells, Chemung Gr. [Sig. sur- 

 passing, going before.] 

 wyomingensis, Lea, 1852, Jour. Acad. 



Nat. Sci., 2d series, vol. 2, Coal Meas. 



[Ety. proper name.] 



