286 
PALEONTOLOGY OF NEW YORK. 
Genus CRYPTONELLA, Hall. 186J. 
PLATE LXXX. 
1860. Terehratula, Hall. Thirteenth Ann. Rept. N. Y. State Cab. Nat. Hist., p 2 >. 88, 89. 
1861. Cryptojiella, Hall. Fourteenth Ann. Rei)t. N. T. State Cab. Nat. Hist., p. 102. 
1862. Cryptonella, Hall. Fifteenth Ann. Rei't. N. Y. State Cab. Nat. Hist., pi. iii, figs. 6. 7, 8, 9. 
1862. Cryptonella, Billings. Canadian Naturalist and Geologist, vol. vii, jn 392. 
1863. Cryptonella {partim). Hall. Sixteenth Ann. Reiit. N. Y. State Cab. Nat. Hist., p. 42, figs. 8-11; 
J-). 43, fig.«. 8-11; p. 48. figs. 22, 23 ; p. 49, figs. 24-26. 
1863. Cryptonella (partim). Hall. American Jour. Sci., vol. xxxv, p. 396. 
1863. Cryptonella (partim), Billings. American Jour. Sci., vol. xxxvi, p. 238. 
1863. Cryptonella (partim). Hall. Transactions of the Albany Institute, vol, iv, pp. 132, 148. 
1865.('l)C'e?jf.r(weZto, A. Wincuell. Pi'oc. Acad. Nat. Sci. Philadeliihia, vol. ix, second ser., p. 123. 
1867. Cryptonella, Hall. Twentieth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 164. 
1867. Terehratula, Cryptonella, Hall. Palaeontology of New York, vol. iv, jip. 386-389, 391, 398, 
jil. lx, figs. 5-16, 32-44, 49-65, 68-71; jil. Ixi, figs. 1-41. 
1868. Ceiitrovella, Hartt. Dawson’s Acadian Geology, second ed., p. 300, fig. 99. 
1872. Cryptonella, Hall and Whitfield. Twenty-fourth Ann. Rep. N. Y. State Cab. Nat. Hist., ji. 199. 
1874. Waldheimia, Derby. Bull. Cornell Univ., vol. i. No. 2, p. 3, pi. iii, viii, ix. 
1879. Retzia, Barrande. Systeme Silurien du Centre de la Boheme, vol. v, pis. xiii, cxli. 
1882. Waldheimia, 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, jd. iv, fig. 4 ; pi, xv., fig. 2 
1888. Cryptonella, Herrick. Bull. Denison University, vol. iii, p. 48, jd. v, fig. 10. 
1890. Terehratula, Nettblroth. 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, Terehratula Lincklmi, T. rectirostra T. lens, 
T. planirostra, were suggested as differing from Terehratula 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 (Paleontology of New York, Volume IV, 
pp. 392, 393); the brachidia of two species originally placed under the genus, 
T. rectirostra and T. planirostra, had been developed, and as this evidence is of 
* Fifteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pi. iii, figs. 6-9. 
t Sixteenth Ann. Rejit. N. Y. State Cab. Nat. Hist., i). 43. 
