96 F. A. BATHER, CBINOIDEA OF GOTLAND. 



diameter while keeping much the same height; the last 3 taper off more suddenly. The 

 importance of this tapering has already been discussed 011 page 7o. 



Relations of the species. - Although possessing 2 primibrachs, this species does 

 not resemble the C. gotlandicus — C. innu 1 series in the shape of its cup or of its arm 

 ossicles, or in the arrangement of the cup-plates; we can therefore hardly suppose that it 

 is a further development from that raee. It is however highly specialized in both arms 

 and anal structures. It is possible that some English specimens may be found to belong to 

 this species; in any case its allies are probably to be sought in some other country than 

 Gotland. 



Locality in Gotland: the Klinteberg (f). It possibly occurs in England. 



Calceocrinus pinnulatus, n. sp. 



(Plate IV, figs. 129—140.) 

 Diagnosis. 



Proportions of cup are, — height 1; width 1.09; width at hinge 1.77; thickness 

 1.54. Cup seen from 1. ant. radius quadrangular, low, upper angles truncated; sides very 

 slightly -constricted. 1. ant. R ? and R* connected by a wide suture. T-piece large, bicon- 

 cave; abuts by its sides on infer-radials; its upper eorners may touch some of the main- 

 axils. x wide and low; rests on T-piece and does not touch infer-radials. 1. ant. arm 

 bifurcates on IBr t ; the branehes are of almost the same size as the adjacent mainaxil- 

 arms. The branehes bear pinnules, the first of which is given off on the adanal side of 

 IIBr g . Ant. and 1. post. arms have mainaxils from IXax to Xlax. IBr 2. Axil-arms 

 very gradually decrease in size adanally; they bear pinnules, of which the first is given 

 off on the adanal side of aJBrj (this is contrary to the normal type). Hinge with no cross- 

 processes, owing to width of 1. ant. II'. Ornament not seen. Stem-ossieles with gentle 

 sagittal curve. 



As type-specimen is taken a fairly complete crown with some 12 mm. of stem. 

 There are 2 other specimens, much weathered and verv incomplete, that appear to belong 

 to this species. 



Description. 



General appearance of crown massive and tun-bellied. 



Dorsal cup: The general outline as seen from the 1. ant. radius is low and quad- 

 rangular, with the upper angles truncated by the faeets of the large radials, and with 

 the sides very slightly constricted. The measurements are, — height 6.5 mm.; width 11 

 mm., along hinge 11.5 mm.; thickness about 10 mm. The height of the cup is to the 

 length of the arms as 8 to 48, less than even C. nitidus. The left anterior and right 

 postcrior faces are almost at right angles. 



Base triangulär, and very largely cut into by the stem-facet. 



