290 PALEONTOLOGY OF NEW YORK. 



Genus STROPHONELLA, Hall. 1879. 



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



1828. LeptcBna, Dalman. Kong-l. Vetenskaps-Akadem. Handlingar, p. 108, pi. i, fig. 3. 



1837. LeptcBna, Hisingbr. Lethjea Sueoica, p. 69, pi. xx, fig. 4, 



1838. LeptWna, CoNRiD. Second Ann. Kept. Palfeontological Dept. N. Y., pp. 112, 117. 



1839. Leptaena, Sowerby. Murchison's Silurian System, p. 622, pi. xii, fig. 1. 



1840. Ortkis, von Buoh. Mem. Soft. Geol. de France, vol. iv, p. 222, pi. xii, fig. 26. 



1842. Strophomena, Vanuxem. Geology of N. Y. ; Rept. Third District, p. 122, fig. 5. 



1843. Strophomena, Hall. Geology of N. Y. ; Rept. Fourth Distiict, p. 101, fig. 3. 



1846. OHMs, McCoT. Synopsis Silurian Fossils Ireland, p. 30, pi. iii, fig". 11. 



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

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



1852. Leptosna {Strophomena), McCoy. British Palseozoic Fossils, pp. 243, 244. 



1857. Strophomena {Strophodonta), Hall. Tenth Rept. N. Y. State Cab. Nat. Hist., pp. 49-51, 53, 111, 



figs. 1, 2. 



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



1858. Strophomena, Schmidt. Silur. Format. Estlaiid, Nord-Livl. und Oesel, p. 215. 



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



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



1860. Strophomena, F. Roemkr. Sil. Fauna westl. Tennessee, p. 66, pi. v, tig. 3. 



1861. Strophomena, Billings. Canadian Journal, vol. \a, p 345, figs. 119, 120. 



1863. Strophomena, Billings. Proceedings Portland Soc. Nat. Hist., p. 108, pi. iii, fig. 2. 



1863. Strophomena, Billings. Geology of Canada, p. 867, figs. 376, 378. 



1865. Strophodonta, Meek. Amei-ican Journal of Science, vol. xl, p. 33. 



1867. Strophodonta, Hall. Palaeontology of N. Y., vol. iv, pp. 93, 112, jil. xiv, figs. \a-i; i)l. xix, 



tigs. 6, 7. 

 186S. Strophomena (Strophodonta), Meek and "Worthen. Geol. Illinois, vol. iii, p. 374, pi. vii, fig. 10. 

 1871. Strophomena, Kayseh. Zeitschr. der deutsch. geolog. Gesellsch., vol. xxiii, ji. 628, pi. xiv, fig. 3. 

 1871. Strophomena, Dts^va&oti. British Silurian Braciiiopoda, p. 28S, pi. xl, figs. 1-5 ; p. 290, pi. xl, 



figs. 9-13. 

 1874. Strophomena, Billings. Palaeozoic Fossils, vol. ii, p. 31, pi. iii, fig. 2. 

 1879. Strophonella, Strophodonta, Hall. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist., pp. 152, 



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

 1879. Strophomena, Bareande. Systeme Silurien du Centre de la Boheme, vol. v, pi. xxxix, figs. 1-8. 



1882. Strophonella, Strophodonta, Hall. Eleventh Rept. State Geologist Indiana, pp. 290, 292, pi. xxii, 



figs. 1-3 ; j)l. xxiii, tigs. 1-S. 



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



1884. Strophodonta, Waloott. Palaeontology Eureka Dist., p. 121, pi. xiii, fig. 10. 



1889. Strophonella, Beechbr and Clarkk. Mem. N.Y. State Mus., vol. i, No. 1, p. .'5, pi. iii, figs. 1-S. 

 1889. Strophodonta, Nbttblroth. 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 



