42 SMITHSONIAN INSTITUTION 



PLATE XVIII 

 (All figures natural size except where otherwise stated) 



PAGE 



Figs. i-g. Sagenocrinus expansus (Phillips) 218 



Fig. I. The type; copy of Phillips, Sil. Syst., pi. 17, fig. 9, reduced. From Dudley, England; 

 formerly in collection of Benjamin H. Bright, near Dudley. It shows the interbrachial 

 structure and arms very Avell. Whereabouts of specimen unknown. 

 20. Large specimen, but little compressed, and having nearly the normal contour of mature 

 calyx; posterior view. Shows 4 series of plates midway on the anal side. 



Dudley, England. 

 2b. Basal view of same; showing form and proportions of the principal calyx plates, especially 

 RA within the ring of RR. 



3. Similar rotund specimen, with arms nearly complete, posterior view ; iBr passing into 



tegmen between IIIBr. Dudley, England. 



4. Mature flattened specimen with arms complete and showing characters of stem ; anterior 



view, base broken and distorted. Dudley, England. 



5. 6. Two smaller flattened specimens in posterior views, showing position of RA. 



Dudley, England. 



7. Smaller specimen with arms complete, anterior view ; showing first iBr almost connecting 



with BB. Dudley, England. 



8. Very young specimen, flattened, anterior view; iBr connecting with BB — a stage which 



suggested the reference by some authors to Rhodocrinidae. Dudley, England. 



g. Very mature specimen, somewhat flattened, with plates marked by crescentic bands. 

 Shows beautifully the full length of the coiled arms, and the iBr curving in upon the 

 tegmen ; lower part of calyx broken and restored in outline. Dudley, England. 



Wenlock Gr. ; Silurian. England and Gotland. 



All the specimens are in the author's collection unless otherwise stated. f 



(Continued on Plate XIX) 



