. Bergens Museums skrifter. Protistplankton. 123 Mori'ovtT. I liavc bcni cniililtMl, l)y kiiiil assistance from differ- riii (|iiart('rs. to obtain soiiic ricluT nulioiaria samples — most of tlifiii. luifortuuateiy, of fossile species —, which, althoufrh 1 have not yet hy far been able to work them tiirougii, as far as I can see, show that my opinion of the strnctnre of this division of NasseUaria is on the wliole correct. 1 iiope in the futnre in a more detailed work to be able to eive more exact leasons for my opinion, and try to apply it consistently to the more important i:enera of ^V^s- s
. Bergens Museums skrifter. Protistplankton. 123 Mori'ovtT. I liavc bcni cniililtMl, l)y kiiiil assistance from differ- riii (|iiart('rs. to obtain soiiic ricluT nulioiaria samples — most of tlifiii. luifortuuateiy, of fossile species —, which, althoufrh 1 have not yet hy far been able to work them tiirougii, as far as I can see, show that my opinion of the strnctnre of this division of NasseUaria is on the wliole correct. 1 iiope in the futnre in a more detailed work to be able to eive more exact leasons for my opinion, and try to apply it consistently to the more important i:enera of ^V^s- scllariii. My remark, that Hakckel had to some extent ijruored certain piimary skeleton parts, which I consider to be the principal type fur all the forms which I have examined, may give rise to some niisnnderstandiny. Haeckel several times draws special attention to the ..basa'l tripodium" as a ground plan, from which a large number, perliajis all. of the forms may be developed. This triradial iiTonndplan also lies at the bottom of certain classitications in his system. According' to my opinion, thei'e is something wanting here — of which more further on — which is of gi-eat import- ance. Thus I found, quite at the beginning of my work with XasseJlaria (.IihuiExsEx L. 911 that Claparede's genus Playiacantha was of lUfferent structure than Haeckel (and Clapahede) had de- scribed, and, unfortunately, proved to have the same structure which Haeckel describes as characteristic for other genera (Plagonidium HcK., Plagiocarjya Hck., Peripleeta Hck.). This peculiar structure is, however, not contined to radiolaria beloHL^'ing to the genera mentioned, but is common to the whole division, \\-itli variations in development in ditferent directions (see below). This circumstance of itself makes it impossible to retain Haeckel's g"enera in their original detinition. Whoever has tried to use Haeckel's system of classification of Xassellariu foi' other divisions, as, for ins
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