386 Dr. F. A. Bather on British Fossil Crinoids : 
were discussed by Guiscardi and Meneghini (doce. citt. infra), 
but their material was not enough to permit of satisfactory 
conclusions. 
Balanocrinus didactylus. 
Pentacrinites didactylus @Orb. MS., d’Archiac, 1846, Mém. Soc. Géol. 
France, sér. 2, tome ii. le partie, p. 200, pl. v. figs. 16, 16 a, 17, 17 a, 
18. 
Pentacrinus pratt T. & T. Austin, 1847, ‘ Monogr. Crinoidea,’ p. 124, 
pl. xvi. figs. 4 a—-c. 
? Pentacrinus dixoni Ooster, 1870, ‘ Protozoé helvetica,’ vol. ii. p. 64, 
pl. xi. fig. 2. 
Pentacrinus didactylus V’Ovb. d’Archiac, Guiscardi, 1874, Rend. Accad. 
Sci. Napoli, anno xiii. p. 166. 
Pentacrinus didactylus dOrb., Meneghini, 1875, Atti Soc. Toscana 
Sci. Nat., vol. ii. p. 36. 
Pentacrinus didactylus VOrb., Quenstedt, 1875, ‘ Petrefactenkunde 
Deutschlands,’ vol. iv. p. 268, pl. xcix. figs. 164-166, 
? Pentacrinus (Balanocrinus ?) dizont Ooster, de Loriol, 1879, ‘Monogr. 
Crin. foss. Suisse,’ Mém. Soc. paléont. Suisse, vol. vi. p. 162, pl. xvii. 
figs. 8, 9. 
Pentacrinus subbasaltifornus Miller, E. Forbes, 1852, ‘ Palaeont. Soc. 
Monogr. Tertiary Echinod.,’ p. 84: refers d’Archiac’s fig. 18 doubt= 
fully to this species. 
Since the choice between the trivial names didactylus and 
pratt depends on the dates, which are rather close, it may 
be well to reprint, with corrections and evidence, the biblio- 
graphic details of the Austins’ Monograph that accompanied 
the first article in this series (Ann. & Mag. Nat. Hist., 
ser. 6, vol. v., April 1890, p. 308) :— 
No. 1. Sig. B, c. Pp. 1-16. Pls.I.,II., 1843. April (date on wrap- 
& frontisp. per). 
» 2 5 DB. ,, 17-32. ,, L,IV. _ 1848. Juneor later (dateon 
plates). 
Fe sgt NG ogee aut agg Wenge We 1844. (T. Austin,sen., adds 
F.G.S. on wrapper ; 
elected Jan. 1844.) 
» 4. oyy By dD 7,, 49-64. -, VIL, VIL. 1845.4(Pl. Vl bears'date 
1844.) 
$y ds, Ld RiP - OO. tg Ne, As, 1846. (Date confirmed by 
Austin’s MS.) 
palate oly Welagnlaiisy: ee OO, . yg, Sklep ©, 1847. (Pl. XI. bears date 
Sept. 1846.) 
oy NG OF Gate LLDCS, 
. x, 118-128. ,, XV., XVI. 1847. (Q. J. Geol. Soe, 
xxxvill., Proc., p. 
53.) 
On 
me) 
© 
The British Museum possesses the large series of specimens 
