EXPLANATIONS OF PLATE 10 (1). 



ACTINOCRINUS SEMIRADIATUS. page 379. 



Fig. 1. An internal cast of a specimen of this species, showing the characters as 

 described. 



Rhodocrinus [?] RECTUS. page 318 (14). 



(CRiNocrsTiTEs RECTUS). page 379. 



Fig. 2. View of an interior cast, presenting one of the interradial areas, and two of the 

 radial series. 



Glyptaster occidentalis. page 326 (22). 



Fig. 3. Lateral view of a well preserved cast of this species. 



Glyptaster pentangularis. page 326 (22). 



Fig. 4. An internal cast of this species, preserving the impressions of the plates. 



Melocrinus verneuili. page 327 (23). 



Fig. 5. An internal cast of this species. The constriction between the arms is not quite 

 so deep as in some examples. 



Lampterocrinus inplatus. page 328 (24). 



Fig. 6. Lateral view of a well preserved cast of this species, which preserves the mark- 

 ings of the plates in an unusual degree. 



Macrostylocrinus striatus. page 327 (23). 



Fig. 7. External characters of the species, taken from a gutta-percha cast from the 

 natural mould. 

 '' 8. The internal cast of the same individual. 



Glyptocrinus nobilis. page 328 (24). 



GtYPTOCRiNUS siphonatus. page 328 (24). 



Fig. 9. A View of the external surface as obtained from an impression in the natural 

 mould. 

 '' 10. Lateral view of an internal cast of this species The base has been broken off. 



Glyptocrinus jtajna^es". paee 328 (24). 



Eucalyptocrinus armosus, M'Chesney, New Palasozoic Fossils etc., pa. nD,Feb. 1861. 

 Glyptocrinus siphonatus : Report of Progress, Geological survey of Wisconsin for 

 1860, published Nov. 1861. 

 Fig. 11. Lateral view of an unusually well preserved internal cast on which the boun- 

 daries of the plates are well marked. 

 The similarity in general form betweea this species and G. nobilis is very remarkable, 

 the conspicuous difference in the cast being the strong elevated proboscis in the latter; 

 while in the former the organ occupying this position curves backwards, lying close 

 upon the summit, and is directed downwards to the line of the arm-bases. 



