Page:Scientific results HMS Challenger vol 18 part 1.djvu/208

clxxxviii 1883. (L. N. 46) revises the 4 orders and 32 families of Radiolaria, and gives more accurate definitions of them, as well as of the 2 subclasses (I. Holotrypasta = and ; II. Merotrypasta =  and ).

1885. (L. N. 51) describes 234 new species of fossil Radiolaria from the Jura, and illustrates them by twenty plates. Among them are 103, 130 , and 1 ; 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 approximately 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.