112 FOSSIL ASTEROIDBA. 



OPHIUKA P PULCHEiutiMA, Fric, 1893. 'Arch. Landesdf. Bohmen,' vol. ix, no. 1, 



p. 113. 



Remarks. No description is given. The figure does not show any resemblance 

 of this species to other known forms, but the specimen was obviously imperfect. 

 The upper arm-plates appear to be V-shaped. 



Locality and Stratigraphical Position. Cretaceous (Priesener Schichten), 

 Waldek, near Bensen, Bohemia. 



STELLASTEU ALBENSIS, Geinitz, 1872 5. ' Palasontographica,' vol. xx, pt. 2, p. 16, 



pi. vi, fig. 3. 



Remarks. This species is only known from a cast from the Quadersandstein. 

 In the absence of determinative characters it is impossible to say whether it is 

 identical with or differs from more fully described species. 



STEU.ASTER COOMBII, Forbes, sp., in Geinitz, 1872 5, ' Palasontographica,' vol. xx, 



pt. 2, p. 17, pi. vi, figs. 4 6. 



r 



The specimens illustrated here as 8. Coombii certainly do not belong to Forbes' 

 species of that name. They appear to be ossicles of various species, but I am 

 unable to identify them from the figures given. 



SPECIFIC AND GENERIC CHARACTERS IN CHALK ASTEROIDEA. 



When I commenced this account of Cretaceous Asteroids I endeavoured, so 

 far as possible, to follow the generic classification of previous authors and 

 especially to preserve the continuity of Mr. Sladen's work. More recent work, 

 however, has led me to believe that the shape of the marginal plates, together 

 with their ornament, affords the best determinative generic and specific characters, 

 and further enables us to identify almost all Cretaceous starfishes from single 

 isolated plates. 



Some necessary revision as to nomenclature in both genera and species is given 

 below, together with an illustrated key-table, which it is hoped will enable zonal 

 collectors to identify the isolated asteroid plates which are commonly met with in 



