CRINOIDEA FLEXIBIL[A f.)J, 



Figs. 13-16. Protaxocrinus interbrachiatus ( Angelin) 350 



Fig. 130. One of the type specimens, original of Angelin, pi. 20, fig. 9, and partly of 10; 1. post, inter- 

 radial view. X 2. Riks Museum. FoUingbo. 



13&. Anterior view of lower part, showing interbrachial structures. X 3- 



13c. Posterior view of same; showing RA under r. post, ray, anal series rising from right 

 shoulder of post. B, united for some distance to r. post, ray, and bordered by perisome 

 on the left. X 3- 



I3rf. Intersecundibrachs of .r. ant. ray. X 3- 



I3(?. IVBr, showing ornamentation of the arms. X 3- 



14a. A fine specimen from Follingbo, in part original of Angelin, pi. 20, 10, posterior view; 

 showing posterior rays and anal structures characteristic of the genus. 2 I Br, and 

 RA in primitive position. Note the angular buttresses at lateral face of brachials as 

 far up as can be seen, in this and the next three figures ; these apparent angularities do 

 not indicate that solid plates interlocked with them, for the perisome is actually seen 

 occupying the space next to them, and attached at their inner margin ; this is well 

 shown in fig. 16. X 2. Riks Museum. 



146. Interbrachials at first and second axils of r. post. ray. X 3- 



IS- Broken specimen from Follingbo, showing plates of primary and secondary iBr areas, and 

 how the perisome following the single iBr is attached to the inner margin of the 

 brachials ; coiled distal ends of arms seen at upper part. X 4- Riks Museum. 



16. The same iBr structures in another fragment from same locality. X 4- Riks Museum. 

 Wenlock Gr. ; Silurian. Gotland, Sweden. 



