74 SMITHSONIAN INSTITUTION 



PLATE XXXIV 



PAGE 



Figs. i-io. Ichthyocrinus subangularis Hall 281 



Fig. I. The type specimen from which the species was originally described, subsequently figured in 

 20th Regents Report, pi. 11, fig. 16; somewhat flattened. Rigiit posterior interradial 

 view, showing RA, and the large BB visible in side view. 



Am. Mus. Nat. Hist. Waldron, Indiana. 



2(1. A normal specimen, with cab'x preserved to the second bifurcation, antero-lateral view. 



It has no surface markings; IBB injured. Author's collection. Waldron, Indiana. 

 26. Postero-basal view. Shows relative proportions of plates of base and lower part of rays, 

 especially the form and size of RA as compared with the regular radials. 



3. Posterior view of similar specimen with base perfect. Author's collection. 



Waldron, Indiana. 



4. Lower part of calyx of another specimen, left posterior view; showing large size of 



basals. Author's collection. Waldron, Indiana. 



5. Basal view of another specimen from same collection and locality. 



6. The original of Hall's fig. 13, plate 13, in nth Indiana Report; a very elongate specimen of 



maximum size, with 5 IIBr in one ray. New York State Museum. 



Waldron, Indiana. 



7. Hall's Bridgeport specimen (20th Regents Rep., pi. 11, fig. 15), having the test partly 



preserved ; base wanting. Am. Mus. Nat. Hist. 



From the Racine dolomite. (Bridgeport) Chicago, 111. 



8. A perfectly characteristic specimen from the same locality, internal cast ; from right 



posterior interradius ; RA visible to left. Author's collection. 



9. Younger specimen from same locality, with more spreading calyx and shorter plates ; left 



posterior view, RA visible to right. Author's collection. 

 10a. Perfect crown perhaps of this species, from the Rochester shales, Lockport, New York, 



anterior view. Author's collection. 

 10&. Basal view, showing plates of the base and two posterior rays. 



Niagaran ; Waldron, Racine and Rochester beds ; Silurian. Waldron, Indiana, 

 Chicago, Illinois, and Lockport, New York. 



Figs. 11-14. Ichthyocrinus intermedius Angelin 282 



Fig. Iia. The type, original of Angelin, pi. 17, fig. 7; a complete crown, flattened; from left 



posterior interradius, showing extra plate in left anterior ray. X f ■ Riks Museum. 



Faro (d). 

 lib. Lower portion of calyx, from left anterior ray. The lower plate (radial) in this ray is 



of normal size compared with that in other rays. X 2. 

 lie. The same from right posterior ray, showing the diminished size of the lower plate 



(radianal) compared with that of 1. ant. ray. X 2. 

 lid. Basal view, showing relative proportion of plates of base, and first ray division. X 2. 

 lie. Surface of IIIBr, showing merely granulation, or superficial meshes of stereom, and not 



a true ornamentation. X 12. 

 11/. Outline restoration to show the true contour of crown. 

 120. Lateral view of a fragmentary calyx, with probable outline of crown indicated. 



Riks Museum. Dalhem (d). 



12b. Basal view of same. X 2. 



13a. Right posterior view of smaller specimen from Nas (d). X 2. Riks Museum. 

 13&. Basal view of calyx. X 2. 



14. A specimen from Dudley, England, perhaps of this species. Author's collection. 

 Wenlock Gr. ; Silurian. Gotland, Sweden, unless otherwise stated. 



