clxxxviii 



THE VOYAGE OF H.M.S. CHALLENGER. 



1883. ERNST HAECKEL (L. N. 46) revises the 4 orders and 32 families of Eadiolaria, and gives 

 more accurate definitions of them, as well as of the 2 subclasses (I. Holotrypasta 

 = ACANTHARIA and SPUMELLARIA ; II. Merotrypasta = NASSELLARIA and PILEODARIA). 



1885. D. EiJsx (L. N. 51) describes 234 new species of fossil Eadiolaria from the Jura, and illustrates 

 them by twenty plates. Among them are 103 SPUMELLARIA, 130 NASSELLARIA, and 

 1 PILEODARIA; these are contained in 35 genera, of which 20 belong to the Porulosa, and 

 15 to the Osculosa. 



254. Statistical Synopsis of the Twenty Orders;- 



Note. In the tenth and eleventh columns the relative abundance of each order at or near the surface and near the bottom is approxi- 

 mately indicated by the letters A-E, which have the following significance : A, abundant ; B, very numerous ; C, many (medium quantity) ; 

 D, few ; E, very few. 



