78 F. A. BATHBRj CRINOIDEA 01 GOTLAND, 



whicli hiis qow l)C(!ii removed; it will be referred to as l> in t lie following description, 

 while the type-specimen will be designated it. 



Description. 



Crown as a whole like a partly opened fan; the angle formed by the steni and the 

 1. ant. ann is about 34°, and the intervening space is cntirely occupied by the apposed 

 arms and by the anal plates. 



Dorsal Cup in a is distorted, apparently in eonsequence of the attacks of sonie 

 boring parasite on 1. post. K; thus ant. R is longer tlian 1. post. R, and 1. ant. 1!' is shifted 

 towards the left posterior side of the hinge. Height, measured along 1. ant. radius from 

 the hinge to the lowest point in the articular facet of 1. ant. K 8 , 7.5 mm.; width, at 

 right angles to height, from anterior to left posterior, 8.5 mm.; thiekness, at right angles 

 to height and width, 6.75 mm. In b, the general outline of the cup, as seen from 1. ant. 

 radius, is oblong with a very slight eonstriction half-way up. Height, 9 mm.; width, 

 10 mm.; thiekness, 7 mm. 



Base is in outline a triangle truncated by the stem-facet; it is somewhat swollen. 

 In a, where it is slightly affected by distortion, the width along the hinge-line is 7.5 mm.: 

 if normal it would have been about 9.5 mm.; height, from stem to hinge-line, 4 mm. In 

 />, width 9.5 mm.; height, 4.25 mm. 



BB 3; 1. ant. B and 1. post. B being fused into what may be called 'the left basal'. 

 In a the left basal is triangulär, and occupies nearly the whole of the hinge side of the 

 base; it does not reach the stem-facet; the sutures between it and the other basals are 

 sinuous; width, 7 mm.; height, 3.2 mm. In h this plate is similar in all respects, bnt is 

 ton obscure for measurement. 



The stem is attached to post. B and r. ant. B, the lowcr angles of which it cntirely 

 truncates. The suture-line between these basals, from the stem-facet to the left B, is 1 

 mm. The length of the outer side of these basals, from the stem-facet to the end of the 

 hinge, is 5.25 mm.; along this edge there is a slight groove or rebate, facilitating motion: 

 these points are not elearly shown in h. The stem-facet is almost at right angles to the 

 onter surface of the BB, and is set in a slight bnt clear-cut depression of the plates; its 

 diameter in a is 3 mm., in b, 3.;» mm. In h, where the stem is cleanly broken away, 

 the inter-basal suture is seen to bisect the stem-facet, while the axial canal is on this 

 line, not exactly in the centrc but moved about 3 mm. in the direction of the anal tube. 



RR. — 1. ant. Il; in a the two halves are separated by a distance of 1 mm.; in 

 I) by 1.3 mm. 1. ant. K' is an acute-angled isosceles triangle; in '/ this is somewhat dis- 

 torted, its base being 3.25 mm., its height 5.5 mm.; in h its base is 3.25 mm., its height 

 6 mm. 1. ant. R* is an obtuse-angled isosceles triangle, with its base excavated by the 

 articular facet; the width of its base, i. e. the facet, is 5 mm.; its height measured to the 

 lowest point of the facet is 2 mm.; the sides of the triangle have a slightly convex enrvc: 

 in b the shape of the plate is similar; its width is 6.5 mm., its height 2.5 mm. 



The large radials (ant. R and 1. post. R) form, together with 1. ant. K. a flat broad 

 surface, and then curve gcntlv round to the sides; this curvature is rather greater about 

 the iniddle of their height, and so produces a slight eonstriction. Ant. 1! is six-sided, 



