11 (i F. A. BATHEE, CRINOIDBA OF GOTLAND. 



Anal structures: x apparently shaped as in Botryocrinus, although it may project 

 slightly altove the level of the cup as in Dendrocrinus. It rests on post. B and R ', abuts 

 on the adjacent radials, and supports an anal tube the structure of which is unknown. 



The St em, in the portion preserved, consists of large, swollen, rounded ossieles, 

 alternating with smaller, smoother ossieles. The diameter of the larger ossieles is 2.25 

 mm., their height is 1 mm. The appearance is verv like that of some stems figured by 

 Messrs. H. A. Nicholson and R. Etheridge jun. in their Monograph on the Silurian 

 Fossils of Girvan, Fasc. Ill, Pl. XXII, tigs. 3 and 4. This form of ston is also found in 

 Pycnosaccus srrobiculatus. 



This species Avas not figured by Angelin. 



Locality: Kättlevik in Wamlingbo: Sandstone bed c. Not known ont of Gotland. 



Botryocrinus. 



(Plate V, tig-. 160— Plate VI, tig. 133.) 



1X7K. Angelin, Iconographia, p. 24. 



1S7S, Sicyocrinus, Angelix, loc. /'it. 



1886, Homocrinus pars, WACHSMUTH and SPRINGER, Revision, III, p. 220. 



1891, Bvtryocriwis, BATHER, Ann. Mag. Nat. Hist., ser. 6, vol. VII, p. 392. 



1892, Botnjocrinus, Batuer, Ann. Mag. Nat. Hist., ser. Ii, vol. IX, p. 189. 



I have (/er. rit., 1891) so recently discussed the rnorphology and relations of this 

 genus that it is unnecessary to say mueli here. It will only be expected of me to prove 

 eertain statements made in my previous paper as to the invalidity of Angelin's, genus 

 Sicyocrinus. This will be done in the description of the species B. cucurbitaceus Ang. sp. 

 As to the validity of Botryocrinus itself, the absenee of more precise information from 

 American paheontologists as to Vasocrinus and Barycrinus leaves us still doubtful. Since, 

 hovvever, many species of a form indistinguishable from Botryocrinus have been referred 

 by Messrs. Wachsmuth and Springer and others, not to Vasocrinus or Barycrinus, but 

 to Homocrinus, where, as already shown (p. 108), they cannot belong, it seems likely that 

 thev, together with the European species, can somehow or other be maintained in a sr- 

 parate genus. For the present then I repeat, with slight emendation, the diagnosis pre- 

 viously given (loc. rit.) 



Generic Uiagnosis. 



Cup cyathiform, with plates of medium thickness. IBB 5, BB 5, KK 5. Arms with 

 two (rarely three or four) main branches bearing armlets or pinnules. W small, oblong 

 or rhomboid. x nearly sitinc shape as KU. Ventral sac ' ., to ~ .. length of arms, com- 

 posed of primitively hexagonal plates. Stem round, subpentagonal, or quinquelobate, with 

 small pentagonal axial canal, and with radial sutures, occasionally obscured. 



