200 
Genus — TEREBRATULA, Lhioyd, 
Terebeatula saccules, W. Martin} 
PI. XV, Pig. 3, 4, and 5. 
Conchy liolites anomites sacculus, W. Martin, 1809, Petrif. Derbiensis, p. 14, pi. 4G, fig. 
1 , 2 . 
Terehratula sacculus, 
,, hast at a, 
a J3 
,, cymhceformis, 
Atrypa cymb(Bformis, 
,, hiimdata, 
Terehratula amygdala, 
„ elongata, 
,, sacculus, 
„ ha slat a. 
J. de C. Sowerby, 1824, Min. Concb., Y, p. 65, pi. 446, fig. 1. 
Idem, 1824, ihid., p. 66, pi. 446, fig. 2, 3. 
J. Morris, 1845, In Strzelecbi’s Pliys. Descr. N. S. AVales 
and Y. D. Land, p. 278. 
Idem, 1845, ihid., p. 278, pi. 17, fig. 4, 5. 
F. McCoy, 1847, Ann. Mag. Nat. Hist., XX, p. 231. 
Ide^n, 1847, ibid., p. 231, pi. 13, fig. 9. 
J. D. Dana, 1849, Geol. Wilkes’ IJ.S. Explor. Ex 2 :)ed., p. 682, 
pi. 1, fig. 2. 
Idem, 1849, ihid., p. 682, pi. 1, fig. 3. 
Idem, 1849, ihid., p. 683, pi. 1, fig. 5. 
T. Davidson, 1867, Mon. Brit. Garb. Bracb, p. 14, pi. 1, fig. 
23, 24, 27, 29, and 30. 
Idem, 1837, ihid., p. 12, pi. 1, fig. 1-12. 
,, sacculus, 
55 55 
,, homdens, 
„ hastata. 
Idem, 1862, ihid. (Appendix), p. 212, pi. 49, fig. 11-30. 
J. W. Dawson, 1868, Acad. Geol., p. 289, fig. 87. 
L.-G. de Ivoninck, 1872, Eecb. Anim. Foss., II, p. 65, pi. 2, 
fig. 16 (for synonomy of the species) . 
F. B. Meek and A. H. Wortben, 1873, Geol. Pal. Illinois, Y, 
p. 572, pi. 25, fig. 5. 
F. Eoemer, 1876, Lethsea Pal., pi. 13, fig. 5. 
There have been no recent modifications in the distinguishing charac- 
teristics of this species, and I must therefore content myself with repeating 
what I said of it in 1872 in my “ Monograj)hie des Eossiles carhonifdres de 
Carinthie.” This species is very variable in form and size ; its principal 
varieties were for a long time considered distinct species, and were successively 
* [Mr. R. Etheridge, Jiinr., is of opinion that Dielasma cyrnhcv/ormis, Morris, here classed by De Koninck 
as a synonym of D. sacculus, is a valid species. Geol. and Pal. Q’land., 1892, p. 225, t. 9, f. 10, 11. — W.S.D.] 
