BRACHIOPODA. 
265 
Genera (1) CENTRONELLA, Billings, 1869; (2) OBISKANIA, 
GEN. NOV. ; (3) SELENELLA, gen. nov. ; (4) ROMINGERINA, 
GEN. NOV.; (5) TRIGERIA, Bayle, 1875; (6) NOTOTHYRIS, 
Waagen, 1882. 
PLATES L, LXXVI, LXXIX. 
(5) 
1841. 
(1) 
1867. 
(1) 
1859. 
(5) 
1860. 
(1) 
1861. 
(1) 
1861. 
(1) 
1862. 
(1) 
1862. 
(4) 
1862. 
(5) 
1862. 
(6) 
1862. 
(1) 
1863. 
(1) 
1863. 
(1) 
1863. 
(1) 
1863. 
(4) 
1863. 
(4) 
1863. 
(6) 
1863. 
(1)' 
* 1865. 
(1) 
1867. 
(3) 
1867. 
(4) 
1867. 
(5) 
1867. 
(1) 
? 1870. 
(5) 
1875. 
(6) 
1878. 
(5) 
1882. 
(6) 
1882. 
(5) 
1883. 
(5) 
1885. 
(1) 
1888. 
(1) 
1889. 
(5)' 
? 1890. 
(6)' 
? 1890. 
(2) 
1892. 
Terehratula, Phillips. Palieoz. Foss. Cornwall, Devon and West Somei'set, p. 91, pi. xxxv, 
fig’. 167. 
Rhynchonella, Hall Tenth Ann. Kept. N. Y. State Cab. Nat. Hist., p. 124, figs. 1-6. 
Centronella, Billings. Canadian Naturalist and Geologist, vol. iv, p. 131, figs. 1-5. 
Rhynchospira, Hall. Thirteenth Ann. Kept. N. Y. State Cab. Nat. Hist., p. 83. 
Centronella, Billings. Canadian Journal, vol. vi, p. 271, fig. 97; p. 272, figs. 98, 99. 
Centronella, Hall. Fourteenth Ann. Kept. N. YL State Cab. Nat. Hist., p. 102. 
Centronella, Hall. Fifteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pi. iii, figs. 1-5. 
Centronella, Billings. Canadian Naturalist and Geologist, vol. vii, p. 392. 
Centronella, A. Winchell. Proc. Acad. Nat. Sci. Philadelphia, vol. vii, p. 405. 
Rensselceria, Billings. Proc. Portland Soc. Nat. Hist., vol. i, p. 115, plate, fig. 12. 
Terehratula, Davidson. Quartei-ly Journal Geological Society, vol. xviii, p. 27, pi. ii, fig. 4. 
Centronella, Hall. Sixteenth Ann. Rept. N. Y. State Cab Nat. Hist., pp. 45-47, figs. 13-17. 
Centronella, Hall. American Journal of Science, vol. xxxv, p. 402. 
Centronella, Billings. Amei’ican Journal of Science, vol. xxxvi, ji. 236. 
Centronella, Billings. Geology of Canada, p. 374, figs. 403-405. 
Cryptonella, Hall. Sixteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pp. 41-43. 
Cryptonella, Hall. Amei-ican JournaPof Science, vol. xxxv, jip. 399-402. 
Terehratula, de Konince. Foss. Paleoz. de ITnde, p. 32, pi. ix, tig. 4. 
Centronella, A. Winchell. Proc. Acail. Nat. Sci. Philadelphia, vol. ix, pp. 122, 123. 
Centronella, Hall. Palaeontology of New Y^ork, vol. iv, pp. 399-403, 420, pi. IxIa, figs. 1-40. 
Centronella, Hall. Palaeontology of New York, vol. iv, p. 419, pi. IxIa, figs. 47-49. 
Centronella, Hall. Palaeontology of New Y^ork, vol. iv, p. 419, pi. IxiA, figs. 41-45. 
Centronella, Hall. Palaeontology of New York, vol. iv, p. 276, pi. xlv, figs. 1-6. 
Centronella, A. Winchell. Proc. American Philosophical Society, vol. xii, p. 254. 
Trigcria, Bayle. Exiilic. de la Carte Geolog. de France, Atlas, pi. xiii, figs. 5-12. 
Terehratula, Abich. Geolog. Forsch. in der Kaukasisch. Landern, I, p. 68, pi. vi, fig. 10. 
Centronella, Davidson. Bi’itish Devonian Bi’achiopoda, Suppl., p. 14, pi. i, figs. 7-9. 
Notothyris, Waagen. Productus limestone Fossils; Brachiopoda, pp. 375-390, pi. xxviii, 
tigs. 1-13; pi. XXX, figs. 13, 14. 
Centronella, CEhlert. Bull, de la Soc. d’Etudes Scientif. d’Angers, pp. 1-11, pi. i, figs. 1-11; 
pi. ii. figs. 1-6. 
Centronella, (Ehlert. Bull, de la Societe d’Etudes Scientif. d’Angers, pp. 1-5, plate, 
figs. 1-19. 
Centronella, Herrick. Bull. Denison University, vol. iii, p. 49, pi. ii, fig. 5. 
C'ereG-oiieZZa, Nettelroth. Kentucky Fossil Shells, p 153, pi. xxxi, tigs. 14-17. 
Centronella {?), Derby. Archives do Museu Nacional do Rio de Janerio, vol. ix, p. 84. 
Notothyris (?), Derby. Archivos do Museu Nacional do Rio de Janeiro, vol. ix, p. 81. 
Centronella, Beecher and Clarke. American Journal of Science, vol. xliv, p. 414. 
In discussing the genus Renssel^ria and its subgenus Beachia, it has been 
observed that these shells combine a plicated or striated exterior with a brach- 
idium constructed upon the same type as that of Centronella, Billings. 
