286 PALEONTOLOGY OF NEW YORK. 



Gbnus crypt ONEL la, Hall. 1861. 



PLATE LXXX. 



1860. Tmibrotula, Hall. Thirteenth Ann. Kept. N. Y. State Cab. Nat. Hist., pp. 88, 89. 



1861. Cryptonetla, Hall. Fourteenth Ann. Kept. N. Y. State Cab. Nat. Hist., p. 102. 



1862. CryptanfUa, Hall. Fifteenth Ann. Kept. N. Y. State Cab. Nat. Hist., pi. iii, figs. 6, 7, 8, 9. 



1862. Cryptonella, Billings. Canadian Naturalist and Geolo^'ist, vol. vii, p. 392. 



1868. Cryptonella {partim). Hall. Sixteenth Ann. Rei>t. N. Y. State Cab. Nat. Hist., p. 42, figs. 8-11; 

 p. 43, figp. 8-11; p. 48. figs. 22, 23 ; p. 49, figs. 24-26. 



1863. Vryptonella {partim), Hall. American Jour. Sci., vol. xxxv, p. 39G. 

 1863. Cryptonella (partim), Billing.s. American Jour. Sci., vol. xxxvi, p. 238. 



1863. Cryptonella (partim). Hall. Transactions of the Albany Institute, vol. iv, pp. 132, 148. 

 \^i.(})Centrt»ulla, A. Winchkll. Proc. Acad. Nat. Sci. Philadelphia, vol ix, second ser., p. 123. 

 1867. Cryptonella, Hall. Twentieth Ann. Kept. N. Y. State Cab. Nat. Hist., p. 164. 



1867. Tmbratiila, Cryptonella, Hall. Palseontology of New York, vol. iv, pp. 386-389, 391, 398, 



pi. Ix, figs. 5-16, 32-44, 49-6.'>, 68-71; pi. hi, figs. 1-41. 



1868. Centronella, Habtt. Dawson's Acadian Geology, second ed., p. 300, fig. 99. 



1873. Cryptonella, Hall and Whitfield. Twenty-fourth Ann. Rep. N. Y. State Cab. Nat. Hist., p. 199. 



1874. WaldAeimia, Dbrby. Bull. Cornell Univ., vol. i, No. 2, p. 3, pi. iii, viii, ix. 



1879. Retzia, Barrandb. SystSme Siiurien du Centre de la Boheme, vol. v, pis. xiii, cxii. 



1882. Waldlteimia, Davidson. British Devonian Brachiopoda, Suppl., pp. 12, 13, pi. i, figs. 1-4. 



1884. Cryptonella, Walcott. Monogr. U. S Geol. Survey, vol. viii, p. 163, pi. iv, fig. 4 ; pi. xv., fig. 2 



1888. Cryptonella, Hbbbick. Bull. Denison University, vol. iii, j). 48, pi. v, fig. 10. 



1890. Terebraiula, Nbitblboth. Kentucky Fossil Shells, p 155, pi. xvi, figs. 20-22, 



This name, though introduced in 1861, first acquired a positive value in 

 1867. In the original description of the genus no type-species was designated 

 though several Devonian shells, Terebratula Lincklani, T. rectiroslra T. lens, 

 T. planirostra, were suggested as differing from Terebratula in some external 

 features, and in the character of the muscular impressions. Subsequently, in 

 1862, the name was applied to a rare and previously undescribed species from 

 the Lower Helderberg, C. eximia, of which figures were given showing the exte- 

 rior, together with illustrations of the interior in a species not named.* In the 

 following year the interpretation of the name was based largely upon the evi- 

 dence of the internal structure presented by the Centronella Julia, A. Winchell, 

 a shell of similar exterior to those upon which Cryptonella has been founded.f 

 The subject was rediscussed in 1867 (Palaeontology of New York, Volume IV, 

 pp. 392, 393) ; the brachidia of two species originally placed under the genus, 

 T. redirostra and T. planirostra, had been developed, and as this evidence is of 



* Fifteenth Ann. Kept. N. Y. 8tote Cab. Nat. Hist., pi. iii, tigt<. 6-9. 

 t Sixteenth Ann. Kept. N. Y. State Cab. Nat. Hist., p. 43. 



