68 CHRONOLOGICAL LIST. 



1855. 



DesOR, Synops. ficnin. foss. 1855, pp. 61 - 130. 



Hypodiadema. 



Pseudodiadema. 



Diademopsis. 



Savignya * 



subitlaris. 



spinosissima. 



calamaria. 



Desorii. 

 Asteropyga (err. lyp.) Astropyga Gray, 1825. 

 Coptosoma. 

 Opechinus. 

 Codechinus. 

 Cottaldia. 

 Stomechinus. 

 Hyp echinus. 



1855. 



WRionT. Brit. Oolitic Eehin., 1855, p. 145. 

 Hemipedina. 



1855. 



MlCIIELIN, Rev. Mag. Zool. 1855, p. 245, MaL 

 Sfoera (Mich.) nun Leach, 1813 nee Hubn. 1810. 

 atropus 

 lachesis. 

 clotho ! 



1855. 



Cotteau, Ecliin. Yonne. I. 1855, p. 224. 



Desoria (Cott.) non Ar.ASS. 



1855. 



Cotteau, Bull. Soc. Ge"ol. Frame, XII., 1855, p. 710, Mai. 



Desorella. 



1856. 



Cotteau, Bull. Soc. Geol. France, XIII., 1856, p. 319, February. 



Micropsis. 

 Cyclaster. 



1856. 



Conrad, Pacif. R. R. Ex. Pal. VII. 1856, p. 196, PI. IX. 



Asterodaspis. 

 Scutella 



striatula nnn M. dc Skrres = Scutella excentl'ica Esch. 1829. 



1856. 



Cotteau, Eehin. Sartlic, 185G, p. 417. 



Galeropygus. 



* No species mentioned, group specified. 



