38G Br. F. A. Bather on British Fossil Crinoids : 



were discussed by Guiscardi and Meneghini (locc. citt. infra), 

 but tlieir material was not enough to permit of satisfactoiy 

 conclusious. 



Balanocrinus didacfijlus. 



Pentacrinites didactylus d'Oib. MS., d'Arcliiac, 1846, IMeru. Soc. Gool. 



France, s6r. 2, tome ii. 1'*^ partie, p. 200, pi. v. tigs. 16, 16 a, 17, 17 a, 



18. 

 Tentacrinu^ prattiiT. Sz T. Austin, 1847, ' Monogr. Crinoidea,' p. 124, 



pi. xvi. figs. 4 a-c. 

 ? Fentacrinus cli.i07ii Ootiter, 1870, ' Protozoe helvetica,' vol. ii. p. 64, 



pi. xi. tig. 2. 

 Pfntacrinus didactylus d'Ovb. d'Archiac, Guiscardi, 1874, Rend. Accad. 



Sd. Xapoli, auuo xiii. p. 166. 

 rcntacrinus didactylus d'Orb., Meiiegbini, 1875, Atti Soc. Toscana 



!S{ i. Nat., vol. ii. p. .36. 

 rrntucriuus didactylus d'Orb., Quenstedt, 1875, ' Petrefactenkunde 



Deutscbliinds,' vol. iv. p. 268, pi. xcix. tigs. 164-166. 

 'r Pentacrinus {Balanocrinus?) dixoni Ocster, de Loriol, 1879, 'Monogr. 



Crin fiiss. Suisse,' Meui. Soc. paleont. Suisse, vol. vi. p. 162, pi. xrii. 



tig.s. 8, 9. 

 Peutacrinus suhlasaltif or mis 'SiiWer.^.Yovhea. 1852, 'Palaeont. Soc. 



Monogr. Tertiary Echinod.,' p. 34 : refers d'Arcbiac's tig. 18 doubt- 

 fully to this species. 



Since tlie clioice between the trivial names didactylus and 

 prattii depends on the dates, which are rather close, it may 

 be well to reprint, witli corrections and evidence, the biblio- 

 graphic details of the Austins' Monograph that accompanic d 

 the first article in this series (Ann. & Mag. Nat. Hist., 

 ser. 6, vol. v., April 1890, p. 308) :— 



1843. April (date on wrap- 

 per). 



1843. June or later (date on 

 plates). 



1844. (T. .Austin, sen., adds 

 F.G.S. on wrapper ; 

 elected Jan. 184J.) 



1845. (PI. VIII. bears date 

 1844.) 



1846. (Date confirmed by 

 Au.stiu's MS.) 



1847. (PI. XI. bears date 

 Sept. 1846.) 



7. ,. N, o. „ 97-112. „ XIII.. XIV. 1847. 



8. „ p, Q. „ 113-128. ,, XV., XVI. 1847. (Q. J.Geol. Soc. 



xxxviii., Proc, p. 

 53.) 



The British ^luseum possesses the large series of specimens 



