290 PALEONTOLOGY OF NEW YORK. 



Genus STROPHONELLA, Hall. 1879. 



PLATE XU, FIGS. 1-21; AND PLATE XV B, FIG. 10. 

 1828. Leptwna, Dalman. KongL Veteiiskaps-Akadera. Handlingar. )). 108, pi. i, tif,'. 3. 



1837. LepUsna, Hisinger. Lethipa Suecica, p. (59, pi. xx, fig. 4, 



1838. Leptmna, Conrad. Second Ann. Rejit. Palseontological Dept. N. Y., pp. Hi, 117. 



1839. LeptC^na, Sowerby. Murchison's Silurian System, p. 622, pi. xii, fig-. 1. 



1840. Orthis, von Buck. Mem. Soo. Geol. de Fi-ance, vol. iv, p. 222, pi. xii, fiy. 20. 



1842. StropliOjneiM, Vandxbm. Geology of N. Y. ; Rept, Third District, p. 122, fig. 5. 



1843. Slrophmnena, Hall. Geology of N. Y. ; Rept. Fourth District, p. 101. fig. 3. 



1846. OrlUs, McCoy. Synopsis Silurian Fossils Ireland, p. 30, pi. iii, fig. 11. 



1847. Leptmna, Davidson. London Geological Journal, vol. i, pp. 56, 57, pi. xii, figs. 1-8. 

 1852. Leptmna, Hall. Paleontology of N. Y., vol. ii, p. 259, pi. liii, fig. 7. 



1852. Leptmna (Strirplumieiia), McCoy. British Pa!a;ozoic Fossils, pp. 243, 244. 



1857. Stnyi^lumenn (Stropkodonta), Hall. Tenth Rept. N. Y. State Cab. Nat. Hist., pp. 49-51, 53, 11 1, 



figs. 1, 2. 



1858. Stropkodonta, Hall. Geological Survey of Iowa, vol. i. pt. 2, p. 494, pi. iii, fig. 4. 



1858. Strophmnena, Schmidt. Silur. Format. Estland, Nord-Livl. and Oesel, p. 215. 



1859. Strophodonta, Hall. PaU-eontology of N.Y , vol. iii, p. 185-190, 193, 194?, 483, pis. xvi, figs. 13, 



14 (?) ; xviii, fig. 3 ; xx, fig.?. 1-3 ; xxi. figs. 1-9 ; xxiii, figs. 1-7. 



1860. Striiphmnena, F. Roembr. Sil. Fauna westl. Tennessee, p. 66, pi. v, fig. 3. 



1861. StropJiomena, Billinos. Canadian Journal, vol. vi, p 345, figs. 119, 120. 



1863. Sti-opkomena, Billings. Proceedings Poi-tUuid Soc. Nat. Hist., p. 108, pi. iii. fig. 2. 



1863. Strophomena, Billings. Geology of Cana(l.i, p. 367, figs. 376. 378. 



1865. Stropkodonta, Meek. American Journal of Science, vol. xl, p. 33. 



1867 Stropkodonta, Hall. Pala;ontology of N. Y., vol. iv, pp. 93, 112, pi. xiv, figs, la-?,; pi. xix, 



figs. 6, 7. 

 1868. Stvopkomena {Stropikodonta), Meek and Worthbn. Geol. Illinois, vol. iii, p. 374, pi. vii, fig. 10. 

 1871. Stro])homena, Kayser. Zeitschr. der deutsch. geolog. Gesellsch., vol. xxiii, p 628, pi. xiv, fig. 3. 

 1871. .S7ro;j7«'?nt7(«, Davidson. British Silurian Br.acliiopoda, p. 288, pi. xl, figs. 1-5;)). 290, pi. xl, 



figs. 9-13. 

 1874. Straphomt-na, Billings. Palieozoic Fosi?ils, vol. ii, p. 31, pi. iii, fig. 2. 

 1879. Strophondla, Strophodmda, Hall. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist., p)i. 152, 



154, pi. xxii, figs. 1-3 ; pi. xxiii, figs. 1-8. 

 1879. Strophomena, Barranue. Systeme Silurien <Ui Centre de la Boheme, vol. v, pi. xxxix, figs. 1-8. 



1882. Slrophonella, Stroplwdonta, Hall. Eleventh Rept. State Geologist Indiana, i>p. '.290, 292, pi. xxii, 



figs. 1-3 ; pi. xxiii, figs. 1-8. 



1883. Stropkonella, Hall. Rept. N. Y. State Geologist for 1S82, pi. xii (43). 



1884. Stropkodonta, Walcott. Palaeontology Eui-eka Dist., p. 121, )il. xiii, fig. 10. 



1889. Stroplionella, Beecher and Clarke. Mem. N.Y. State Mus., vol. i. No. 1, p. -'5, pi. iii, figs. 1-S. 

 1889. Stropkodonta, Nettelroth. Kentucky Fossil Shells, p. 149. 



Diagnosis. " Shells .semicircular or semielliptical, concavo-convex, resupi- 

 nate, the ventral valve concave and the dorsal valve convex. Ventral area 

 striated, solid, with or without a central deltidial scar, or rarely a partial 

 foramen, with similar features on the narrow area of the dorsal valve ; inner 

 margins of the cardinal areas of each valve crenulate, and from beneath the cen- 

 ter of the ventral area there is often a strong process (frequently bilobed) which 

 extends beyond the cardinal line. Muscular area of the ventral valve strongly 



