1342 Seeigel. 



B. Ivregiilaria Ciiv. 1817. 



I. Oiiatliostomata Zittel 1879. 



A. Holectypoida Dune. 1889. 



12. Farn. Pygastridae Gregory 1900. 



Pygastrides Lov. 1887. 



B. Clypeastroida Dune. 1889. 



13. Fani. FlhulaHidae Gray 1855 emend. Dune. 1889. 



Echmocijamus Phels. 1774. 

 Fihidaria Lm. 1816. 



14. Farn. Layanidae A. Ag: 1872/4. 



Lagamim Menschen 1787. 



15. Farn. Clypeastridae Ag. 1836. 



I. Subfani. Clgpeastriuae Gregory 1900. 

 Cli/peaster Lm. 1816. 

 EcMnanthus Leske 1778. 

 Plesiantlms Dune. 1889. 

 Anomcdanthus J. Bell 1884. 



11. Siibfam. Arachnoidinac Gregory 1900. 

 ÄracJmoides Ag. 1841. 

 Alexandria Pfeff. 1880. 



16. Farn. Scutellidae Gray 1825. 



Echinaraclmius Leske 1778. 

 Echinodisais Leske 1778. 

 Eifcope Ag. 1841. 

 Mcllüa Ag. 1841. 

 MelUtella Dune. 1889. 

 Astriclypeus Verrill 1867. 

 Rotida Meuselien 1787. 

 Moid'msia Ag. 1841. 



II. Atelostomata Zittel 1879. 

 A. Asternata Gregory 1900. 



17. Farn. Echiuoneidae A. Ag. 1881. 1 



Echinoneus Phels. 1774. 



18. Farn. NncleoUtldae Gregory 1900. 



NucleoUtes Lm. 1801. 

 Anoclmnus Gr. 1869. 

 Oligopodia Dune. 1889. 

 Aphauopora Meijere 1902. 



