M-srumoNs OF Till' sl'I-ci 1-s. 245 



form of Mesoblastus comparable to the British M, elongatus or M. Sowerbii (PL VI, 

 fig. 12; PL VIII. fig. 1). But in the absence of sufficiently well-preserved material 



we cannot venture to decide upon the generic position of this rare species. 



Distribution. Granatocrinus, as now defined, is strictly limited to rocks of Carbo- 

 niferous age. Five species occur in the Carboniferous Limestone of Yorkshire, 

 Lancashire, and Derbyshire, two of them (G. Berbiensis and G. ellipticus) being 

 sometimes tolerably abundant. 



The only American species definitely known to us (G. Nbrwoodi) is also the type 

 of the genus, and occurs in the Burlington Limestone at the lower part of the Sub- 

 carboniferous. K Pentremites Boemeri of the Kinderhook Group (Chemung, Shu- 

 mard) really be a Granatocrinus, it is the oldest known species of the genus, which 

 would also extend up into the Chester Group if Granatocrimis curtus, Shumard, be 

 rightly so named. 



Type. Pentremites Nbrwoodi, Owen and Shumard. 



Granatocrinus Nobwoodi, Owen & Shumard, sp. 



(PL II. figs. 34-30 ; PL III. fig. 16; PL VI. figs. 19, 20: PL VII. figs. 1-13; 

 PL X. fig. 11 ; PL XI. fig. 14 ; PL XVII. fig. 8.) 



Pentremites Norwoodi, O. & S., Journ. Acad. Nat. Sci. Philad. 1850, vol. i. pt. 1, p. 64, 



t. 7. f. 13, a-c. 

 Pentremites Norwoodi, O. & S., "Wisconsin, Iowa, and Minnesota Geol. Report, 1852, p. 591, 



t. 5 a. f. 13, a-c. 

 Pentremites Norwoodi, White, Boston Journ. Nat. Hist. 1863, vol. vii. no. 4, p. 483. 

 Eheucriniis Norwoodi, Shumard, Trans. St. Louis Acad. Sci. 1863, vol. ii. no. 1, p. 112. 

 Granatocrinus Norwoodi, Shumard, ibid. 1865, vol. ii. no. 2, p. 375. 

 Granatocrinus Norwoodi?, Meek & Worthen, Proc. Acad. Nat. Sci. Philad. 1866, p. 258 



[G.fimbriatus, MS.). 

 Granatocrinus Nbrwoodi ?, Meek & Worthen, Report Geol. Survey Illinois, 1868, vol. iii. 



p. 496, t. 18. f. 8 {G.fimbriatus, MS.). 

 Granatocrinus Norwoodi, .Meek & Worthen, Proc. Acad. Nat. Sci. Philad. 1869, p. 81. 

 Granatocrinus Norwoodi, Meek & Worthen, Report Geol. Survey Illinois, 1873, vol. v. 



p. 465 (note), t. 9. f. 2, a-e. 

 Granatocrinus Norwoodi, Zittel, Handb. Pal. 1879, 1 Bd. 3 Lief. p. 432, f. 305 b, p. 435, 



f. 308 a (== G.fimbriatus, M. & W.), and 308 b. 

 Granatocrinus Norwoodi, Waclismuth & Springer, Proc. Acad. Nat. Sci. Philad. 1881, 



t. 19. f. 6. 

 Granatocrinus Norwoodi, E. & C, Ann. & Mag. Xat. Hist. 1882, vol. ix. p. 239. 



Sp. Char. Calyx globose, or elliptical-globose, sometimes inflated in the lines of 

 the ambulacra ; summit more or less concave, base contracted, the calyx resting on 

 the inturned radial lips, which border a deep and funnel-shaped pentagonal cavity ; 

 section round or slightly pentagonal, or in one extreme variety decidedly pentagonal ; 



