1342 Seeigel. 



B. Ivregularia Cuv. 1817. 



I. (xiiatliostomata Zittel 1879. 



A. Holectypoida Dune. 1889. 



12. Farn. Pygastridae Gregory 1900. 



Fygastrides Lov. 1887. 



B. ClypeafitroUJa Dune. 1889. 



13. Farn. Flhulariidcie Gray 1855 emend. Dune. 1889. 



Ecliinocyamus Phels. 1774. 

 Fihularia Lm. 1816. 



14. Farn. Layaiiidae A. Ag. 1872/4. 



Lagammi Menschen 1787. 



15. Farn. ClypeastHdae Ag. 1836. 



I. Subfam. Clypeastrinae Gregory 1900. 



Clypeaster Lm. 1816. 

 Ecliinanthus Leske 1778. 

 PlesiantJms Dune. 1889. 

 Anomalauthus J. Bell 1884. 



11. Snbfam. Arachnoidinae Gregory 1900. 



Araclmoides Ag. 1841. 

 Alexandria Pfeff. 1880. 



16. Farn. ScKtellidae Gmy 1825. 



Echinaraclmius Leske 1778. 

 Ecliinodiscus Leske 1778. 

 Eiicope Ag. 1841. 

 3MUta Ag. 1841. 

 Mellitella Dune. 1889. 

 Astnclypeus Verrill 1867. 

 Botida Menschen 1787. 

 Moulinsia Ag. 1841. 



II. Atclostomata Zittel 1879. 

 k. A.steruata Gregory 1900. 



17. Fam. Echiiioneidae A. Ag. 1881. 



EcJiinoneus Phels. 1774. 



18. Fam. Nacleolitidae Gregory 1900. 



NiicleoUtes Lm. 1801. 

 AnocJianus Gr. 1869. 

 Oliyopodia Dune. 1889. 

 ApJianopora Meijere 1902. 



