TAXOCRINIDAE 355 



a ray. Arms heavy throughout, tapering but little; lateral margins of brachials 

 projecting in angular buttresses. Surface smooth. Dimensions of an average 

 specimen: crown, 10 mm. high by 10 wide; base, 2 mm.; calyx to I Ax, 5 mm.; 

 width, 8 mm. Maximum specimen, ij mm. high. 



IBB low, slightly visible beyond the column. BB small except post. B which 

 is large, rising to height of RR. RR the largest plates in the calyx, expanding 

 abruptly from the base. IBr short and about as wide as RR, leaving narrow 

 iBr spaces; IIBr 3 or 2; these and higher Br about twice as wide as high; not 

 over three bifurcations visible. RA very small, rhombic ; anal x much larger, 

 followed by still larger plates in series, the first one or two suturally connected 

 with ray at right side. iBr areas occupied by thin perisome with scattered 

 granules. Column large, facet as large as IBB circlet. 



Out of six specimens, all from Follingbo, four are of about the size stated above as the 

 average, and two are about one-half larger. One of the former (PL XLVII, fig. 6) is 

 abnormal in having a pentagonal RA touching IBB in line with BB ; and one of the latter 

 (fig. 5) in having the large tube median in position, with its lower plate suturally united to 

 the rays at both sides. Figure 1 is a new drawing of Angelin's original, and the others are 

 from specimens found since ; two of them show the interbrachial perisome in strong enlarge- 

 ment, with the calcareous granules well separated. 



Types. All in the Riks Museum, Stockholm. 



Horizon and locality. Silurian, Wenlock Group, horizon /; Follingbo, Island of 

 Gotland. 



Gnorimocrinus cirrifer n. sp. 

 Plate XLVII, figs. 7-12 



A larger species than the preceding. Crown short,- wide, rotund, with 

 widely divergent arms, infolding after third bifurcation; widest about IIBr 3 , 

 where height to width is 1 to 1.3. Calyx broadly and evenly expanding from 

 base to IIBr 2 , where height to width is 1 to 2, and spread from base, 1 to 4. 

 Lateral margins of brachials smooth ; anal tube and arms more slender than in 

 the last species, but rounded, and tapering but little. Surface smooth. In a 

 mature specimen the crown is 17 mm. high and 22 mm. wide ; base, 4 mm. Small 

 specimen, 8 mm. high by 9 wide. Column, 38 mm. long to end of root. 



IBB scarcely visible beyond column. RR large, rather angular dorsally in 

 mature specimens and followed by IBr nearly as wide, leaving but small 

 shoulders at the sides. iBr spaces wide, owing to the spread of the calyx rather 

 than to the space left at the distal edge of RR ; no regular iBr ; perisome not pre- 

 served, and probably thin. IIBr mostly 3, these and higher Br about one-third 

 wider than long. RA small, square ; anal tube of medium size, almost entirely 

 free from the rays. Column short, without proximal enlargement ; composed of 

 a few thin ossicles next to the calyx, thence becoming strong", cylindrical, about 

 as long as wide, with some alternation of thinner ones in upper part. Radicular 



