166 F. A. BATHER, CRINOIDEA OF GOTLAND. 



in diameter. They alternate in height with some regularity, the average height being 

 about 0.5 ni ni. Their edges are rounded and alternately project. The articular surface is 

 radiately striate, and slight crenelations niay sometimes be scen at the suture (tigs. 

 323, 324). 



Notes on Angelin's figures. 



Tal). XVIII, tig. 1. This is of course restored and the artist did not know what 

 to do with the anal x; otherwise the tigure is fair. 



Locality: Follingbo (f). Not known out of Gotland. 



Gissocrinus goniodactylus. 



(Not figured.) 



1839 Cyathocrinites goniodactylus, Phillips in Murchison Silurian System», p. 671, Pl. XVII, fi«;. 1. 

 Cyathocrinus goniodactylus, Auctt. seqq. 



Diagnosis. 



Dorsal Cup slightly wider than high; roughly conical; either with strong axial 

 ridges, or with facets bounded by the axial lines. 1 1 > 1 > of moderate height. HB about 

 as high as wide. RR wider than high; facet between l / 2 and % width of R. IBr 1 or 2. 

 IIBr 2, rarely 3. Arms branch about 6 times. Arm-ossicles usually wider than high. 

 either ridged or rounded, with or without distal expansion. Ventral Sac vertical; composed 

 of roughly quadrangular plates, with strong transverse folds. Stem-ossicles round; very 

 low, the alternate ones of t en ridged. 



The typical form of this species, so common in the Wenlock Liniestone of England, 

 is represented in Gotland by a single crown from the Klinteberg. 



Remarks on the specimen. 



The Crown attains a length of 43 mm. 



The Dorsal Cup is in a rather disturbed state. The axial ridges of its plates are 

 very characteristic. 



Two IBP) are preserved, and these show slight traces of the original sutures. 



IM! are 2.75 mm. high to the bottom of the faeet, and 4.2 mm. wide. The width 

 of the facet is 2.5 mm. 



The Arm-ossicles are of very characteristic shape, with dorsal ridge and distal ex- 

 pansion. 



The lower part of the Ventral Sac is well shown, and is rather stronglv folded. 



This species was not figured by Angelin. 

 Locality in Gotland: the Klinteberg (f). 



