290 PAL/EONTOLOGV OF NEW YORK. 



Genus STROPHONELLA, Hall. 1879. 



PLATE XII, FIGS, l-il; and PLATE XV b, FIG. lu. 

 1828. LeptcBna, Dalman. KongL Vetenskaps-Akadera. Handlingar, \i. 108, jil. i, tig. 3. 



1837. LepUena, Hisingbr. Lethpea Suecioa, p. 69, pi. xx, fig. 4, 



1838. Leptmna, CoiiRAt). Second Ann. Kept. Palaeontologic.al Dept. N. Y., pp. 112. 117. 



1839. Leptana, Sowbrby. MurchisonV Silurian System, p. 622, pi. xii, fig. 1 . 



1840. OrthU, vo.v Boon. Mem. Soc. Gcol. de France, vol. iv, p. 222, pi. xii, fig. 26. 



1842. Stropkwnena, Vanuxem. Geology of N. Y. ; Reiit Third District, p. 122, tig. 5. 



1843. Slrophmnma, Hall. Geology of N. Y. ; Rept. Fouitli District, p. lOL fig. 3. 



1846. OHhis, McCoy. Synopsis SiUirian Fossils Ireland, p. 30, pi. iii, fig. 11. 



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

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



1852. Leptmna (iStrophojnena), McCoy. British Palaeozoic Fossils, pp. 243, 244. 



1857. Strophomena (Strophodonta), Hall. Tenth Rept. N. Y. State Cat>. 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. Estland, Nord-Livl. uiid 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, figs. 1-3 ; xxi, tigs. 1-9 ; xxiii, figs. 1-7. 



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



1861. Strophomena, Billings. Canadian Journal, vol. vi, p 343, figs. 119, 120. 



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



1863. Strophomejia, Billings. Geology of Canada, p. 367, figs. 376, 378. 



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



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



figs. 6, 7. 

 186S. Slroplunneua (Strophodonta), Meek and Worthen. Geol. Illinois, vol. iii, ii. 374, pi. vii, fig. 10. 

 1871. Strophomena, Kaysek. Zeitschi'. der deutsch. geolog. Gesellsch., vol. xxiii, p 628, pi. xiv, fig. 3. 

 1871. Strophomena, '\yKXUiSov. British Silurian Brachiopoda, p. 288, 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, Strnphodsnta, Hall. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist.. p)>. 152, 



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

 1879. Strophomena, Barrande. Systeme Silurien du Centi-e de la Boheme, vol. v, pi. xxxix, figs. 1-8. 



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



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



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



1884. Stropliodonta, Walcott. Palaeontology Eureka Dist., p. 121, pi. xiii, fig. 10. 



1889. Strophonella, Bebcher an<l Clarke. Mem. N.Y. State Mus., vol. i, No. 1, p. -'5, pi. iii, figs. 1-8. 

 1889. Strophodonta, Nettelkoth. Kentucky Fossil Shells, p. 149. 



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

 nate, the ventrsil valve concave and the dorsal valve convex. V^entral 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 



