Kil F. A. BATHER, CJRINOIDEA OF GOTLAND. 



The Arms have been traced up to VIBr. The ossicles are verv slightly expanded 

 distally, and have rounded backs; they are equal, fine and laterally compressed to a con- 

 siderable extent. The axial eanal does not appear to be always distinct. 



The covering-plates are verv minute and härd to distinguish, but appear to have 

 been inuch the same as in preceding speeies of Gissocrinus (fig. 310). Rows of inner 

 plates can be seen, where the sides of the braehials are broken awa\. and traces of t hese 

 inner plates can be seen in section (lig. 311). Al)out 5 covering-plates go to each bracliial. 



I13r 2; rather wide. 



IIBr 2; also wide. 



IIIBr from 2 to 4, thus: 8—3 == 4—3, 2—4 == 4—3 and 2—4 = 4—2. 



Remaining series traced up to VIBr. In a the ossicles of these series are higher 

 than wide, but in l> the opposite is the case. 



Anal structures: x is hexagonal and depressed at the angles; it supports 3 plates. 



The proximal median plate of the Ventral Sac is of the same shape and has the 

 same ornament as x. Similarly all the plates of the sac are hexagonal and depressed at 

 the corners. They never quite attain the parallelism of G. typus, although they approach 

 it distally. In the distal region of the sac too, the transverse folds are exaggerated, while 

 the vertical folds form longitudinal ridges. It is quite clear that there are no slits or 

 pores. The sac is thin, but is not so compressed as in G. typus (figs. 307, 310). 



In /; the anal area of the cup is somewhat disarranged, and there is an appearance 

 of a small radianal as in Botryocrinus; (fig. 312), an appearance which is of considerable 

 interest in view of the possible derivation of this genus from Palceocrinus, for the ab- 

 normality would thus be an instance of atavic reversion. 



The Tegmen is seen in c. It consists of small hexagonal plates and rises into a 

 dome. These small plates come right down to the angle where the radials bend inward 

 (fig. 315, see also fig. 809). 



The Stem consists of pentagonal ossicles, alternating in height and all ridged 

 (figs. 313, 314). 



Notes on Angelin's figures. 



Tab. XXI, figs. 8 and 9 represent the same specimen. The arms appear too thick 

 and flat. 



Tab. XXI, fig. 10 is somewhat restored but is fair; it shows the abnormality in 

 the anal area. 



Tab. XXIX, fig. 75 a is correct. 



Tab. XXIX, fig. 75 l> is a good deal restored. 



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



