140 F. A. BATHER, CKINOIDKA OF GOTLAND. 



Tab. XXIII, fig. 13. This cannot be criticised as the original specimen is not 

 forthcoming. 



Locality: Follingbo, (f); not known out of Gotland. 



Cyathocrinus muticus. 



(Plate VII, figs. 227 —229.) 

 1878 Angelin, tconographia, p. 23, Tab. XXI, figs. 22, 23. 



Diagnosis. 



Dorsal Cup greatly expanded in region of KR. Articular facet of RR bas a gentle 

 slope, so that the arms spread out at an angle of 30° or more with the horizontal. Lower 

 plates of cup irregularly iridented. Tegminal plates ascend the arms, as far as IIBr,. 

 Anal x appears to be pentagonal, supporting two plates -of tube. Ventral sac tubular, 

 with plates slightly folded. Arms at tirst dichotomise at short intervals, then form long 

 and fine arms, with ossieles usually longer than v/ide. 



( )f this species there are two specimens, of whieh one is tigured and must be taken 

 as the type-speeimen, while the other and smaller specimen is badly drawn in the MS 

 sketches, p. 120, No. 34. 



Description. 



Dorsal Cup: In general form this species is between C. glåber and C. distensus, 

 but with a greater resemblance to the latter species. 



I BB 5; low and somewhat irregular in shape (see under »The Stein»). 



BB 5; about as high as wide; 4 hexagonal; post. B heptagonal. 



RR ö; spreading outwards suddenly, especially along the median radial line. The 

 facet is not vertical, but has a gentle slope. 



The iVrms spread out from the cup at an angle of 30° or more with the horizontal, 

 in this respect resembling C. glober and differing from C. distensus; this however, is not 

 due to a wedge-shaped IBi^ as in C. glober, but to the slope of the facet itself. The 

 arm-ossicles are usually higher than wide. 



IBr 2 or 3. 



IIBr usually 2. 



IIIBr 2 or more. 



Subsequently the arms may branch once or twice again: their long and fine branches 

 are gracefully folded över one another. 



Anal structures: x appears to be pentagonal, as represented in Angelin's figure; 

 but its outliiie is rather härd to distinguish. It supports a sac that was apparently tubu- 

 lar, the plates of which were slightly folded. 



The Stem is only preserved in the small specimen, and here oiily quite the proxi- 

 mal portion. This is subpentagonal. Its ossieles are higher in proportion than those in 



