24 SMITHSONIAN INSTITUTION 



PLATE IX 

 (All figures natural size except where otherwise stated) 



^ PACE 



Figs. 1-4. Cholocrinus obesus (Angelin) 173 



Fig. la. The type of Angelin's Forbesiocrinus obesus, original of his pi. 21, fig. 18; from right 

 anterior radius, one of the smaller rays filling only about half the distal edge of R. 



x*. 



I&. Detail from the same view, showing the plated integument between the rays. X 3- 



ic. Anal side of same (Angelin, pi. 28, fig. 2) ; the plates greatly displaced, and anal x pushed 



above line of RR ; RA in plain view. X f ■ 

 id. Outline sketch to identify the principal calyx plates of last figure. 

 le. Anterior view of same, showing one of the large rays, filling nearly entire margin of R. 



X |. 

 20. Another specimen, from right anterior radius, showing the very small ray curved in under 



the adjoining ones; plated integument visible at either side. Natural size. 

 26. Anal side of same, with anal x in position, and space for RA, the plate being broken out. 



XI. 

 3. Posterior view of complete specimen, with arms, stem, and encrusting root; all plates of 



anal side in position, and the posterior rays filling almost the entire margins of RR. 



X2. 

 40. A set of arms, broken off from the calyx below the tegmen ; figured by Angelin, pi. 26, 



figs. 6, 60, as F. divaricatus. Lateral view from right anterior side, showing the large 



anterior and right posterior rays, and the small right anterior ray curved under them. 



X |. 



4&. Distal view of same specimen, anterior side above, showing the relative size of the rays, 

 how completely dwarfed are the two antero-lateral rays and how enormously over- 

 grown the other three. The respective rays are indicated in this and other figures, by 

 the lettering a, ra., etc. (a in 4& omitted in printing), x !• 



4c. The same specimen from the opposite aspect, being an intejior view of the tegmen, anterior 

 ray below ; showing the under side of some ambulacra, and the finely plated inter- 

 ambulacral integument of the disk. X ^• 



4d. Detail of central part of same. X 3- 



4e. Fragment of the same tegmen, seen from the exterior. X 3- 

 Wenlock Gr. ; Silurian. Gotland, Sweden. 



All from Follingbo, horizon (/), and in the Riks Museum. 



