English: Illustration from Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Part III. Original description follows:

Plate 113. Castanellida.
Diam.
Fig. 1. Castanissa challengeri, n. sp.,	×	100
In the lower part of the figure is visible the large corona of teeth around the mouth (a).
Fig. 2. Castanidium moseleyi, n. sp.,	×	80
In the upper part of the figure, at left, is visible the irregular polygonal mouth (a).
Fig. 3. Castanopsis naresi, n. sp.,	×	80
In the upper part of the figure is visible the smooth circular mouth (a).
Fig. 4. Castanura tizardi, n. sp.,	×	80
Fig. 4a. A single main-spine of the same,	×	400
Fig. 5. Castanidium murrayi, n. sp.,	×	100
With a large phæodium, partly protruded through the circular mouth.
Fig. 5a. A single main-spine of the same, hexagonally dimpled,	×	400
Fig. 6. Castanella wyvillei, n. sp.,	×	100
A piece of the shell with the mouth, armed with six large teeth (a).
Fig. 7. Castanidium buchanani, n. sp.,	×	100
A piece of the shell with the smooth roundish mouth (a).