124 V. A. BATIIKIi. CRINOIDEA OE GQTLAND. 



Description of the Specimens. 



Dorsal Cup rather vvider than high; composed of slightly tumid plates arranged as 

 in Cyathocrinus and Mastigocrinus. The cup forms a wide cone, the sides of which appear 

 to be straight. 



IBB o; pentagona] and equal; rather wider than high. 



BB 5; four are hexagonal and rather wider than high; post. B heptagonal, iiaviug 

 a truncate top that supports anal x. 



RR 5; sub-pentagonal, and lunate in outline; height about " 3 width. Radial facet 

 elliptical and occupying the greater part of the width of the radial; it reaehes almost 

 half-way down the radial, is a smooth saueer-like depression and has no distinct axial 

 canal, but has instead a spearhead-shaped notch on the inner side. 



The Arms: not mueh preserved, and the right posterior is the only one of which 

 anything is seen beyond the primibraehs (tig. 194). 



The braehials are about twice as wide as high, and in section are slightly wider 

 than they are deep. As seen from the ventral surfaee, the ventral groove is very narrow 

 compared with the width of the braehials. The groove is also very shallow, with 

 straight sides, and at the bottom is a very deep tongue for the axial eord, which tongue 

 swells out below. This tongue does not reach to the centre of the brachial (fig. 195). 



The eovering-plates are small, subquadrangular or pentagonal, and alternating; they 

 appear to be continuous with the tegminal plates. 



Along the lines of suture between the IBr, on the ventral surfaee of the arm, are 

 rather deep grooves with a slight ledge on either side, along which minute indentations 

 may be detected. These indentations are probably the impressions of small perisomic 

 plates, that have been löst in the fossil (ef. Euspirocrinvs, p. 111). 



The arms bend downwards to a slight extent, a character which made Wachsmdth 

 and Springer compare the genus with Arachnocrinus. The arms do not, howevcr, resemble 

 those of any species ascribed to Arachnocrinus in any other respect. 



IBr 2 or 3. 



IIBr 2. 



IIlBr 4. 



IVBr, 2 are apparently preserved. 



The most remarkable feature of this genus is not the anal tube, as Wachshuth and 

 Springer thought, but the curious processes from certain of the braehials to which the 

 name »false pinnules» is here applied. These are seen on IIIBr 2 and HlBr 3 of one branch, 

 and on IVBr 2 of another branch; in each of these cases they are placed on the inner side 

 of the dichotom. There are, however, indications on IIIBi^ and IVBrj of the above- 

 mentioned branches that similar processes existed on the outer side of the dichotom in 

 these ossicles. In the best preserved examples the process, or so mueh of it as still 

 exists, reseinbles a small brachial or pinnule-ossicle, attached to the side of the main 

 brachial, and receiving a branch from the ventral groove thereof. On the outer side of 

 this small ossiele there are signs of an articular surfaee, so it is to be inferred that each 

 process consisted of several such ossicles. Supposing this to have been the ease, the pro- 



