126 F. A. BATHBR, CRINOIDEA « »F UoTl.ANl). 



Tab. IV, lig-. 8 c represents the same from the side. This figure does not show the 

 folding of the plates clearly enough. 



Locality: Follingbo (f). The genus is not known out of Gotland. 



Cyathocrinid^e. 



Inadunata, Fistulata, Dicyclica; with no radianal or tube-plate in the anal area of the 

 dorsal cup; with anal x either present in the eup or raised above it; with ."> arms, simple 

 and dichotomous; with tegmen rather solid. 



Owing to the slight extent of our knowledge of eertain genera that appear to be- 

 long to this family, the above diagnosis must be considered as provisional. The faraily, as 

 I coneeive it, is divided into three series, Cyathocrinites, Codiacrinites and Achradocri- 

 nites, with the first of wbich alone are we now eoncerned. 



Cyctth ocrinites. 



Cyathocrinida? in whieh the anal x is in line with the radials and supports a ventral 

 sac of considerable size. 



Cyathocrinus. 



(Plate VII, tigs. 199—247, and Plate VIII, figs. 248—260.) 



1821 Cyathocrinus pars, J. S. Miller, »A Natural History of the Crinoidea , p. Xb. 



1879 Cyathocrinus, Wachsmuth and Springer, Revision I, 79, Proc. p. 302. 



1892 Cyathocrinus, Bather, Brit. Foss. Crin. VIII», Ann. Mag. Nat. Hist. ser. 6, vol. IX, p. 202. 



It will not be expected that I shoukl diseuss the history of this name or the validity 

 of this genus, since this was fully done in my paper quoted above. 



Generic Diagnosis. 



IBB 5, equal, pentagonal. BB 5, hexagonal except post. B which is heptagona] and 

 supports x. RR 5, shield-shaped, with facet eircular or elliptic in outline and occupying 

 from l / 3 to 2 / 3 width of R. x tetragonal to hexagonal, in line with RR, and about 2 / 3 

 width of R. Arms long, simple, dichotomising regularly several times; covering-plates 

 alternating, in from 1 to 3 rows on either side. Ventral sac long, composed of usually 

 hexagonal plates either smooth or laterally folded. Madreporite distinct. 



Species of the Genus: The number of species that have been referred at one time 

 or another to Cyathocrinus is very large, including in fäet about lialf the total number of 

 species in the Fistulata. Most of these have been already transferred by previous writers 

 to more fitting resting-places, and a large number of the Silurian species have been found 

 to belong to either Botryocrinus or Gissocrinus. Even the list given by .Messrs. Wachs- 



