Genera Axinella, Phakellia, Acanthella a. o. 321 
Explanation of the Plates. 
(Spicules blue, spongin yellow.) 
Plate 15. 
(All the figures fifty times magnified.) 
Fig. 1. Axinella. Longitudinal section through a part of the axis. 
Numerous funiculi (f) form a network, thus composing a funis. 
Fig. 2. Arinella. Surface view, focussed at about the level of the 
dermis; br terminal brushes from the extra-axial skeleton; here and there, 
they are united by a few spicules. 
Fig. 3. Phakellia. Surface view; on the left hand side focussed 
above the level of the dermis, at the right hand side somewhat under it 
in order to show the faintly visible funes in their relation to the brushes, 
the spicules of which are marked with blue circlets; br terminal brushes 
of extra-axial skeleton; F funes. 
Fig. 4 Phakellia. Longitudinal section through a part of a funis, 
composed of several funiculi (f). 
Fig. 5. Raspailia. lLongitudinal section through a part of the axis. 
Numerous funiculi (f) form a network, thus composing a funis. 
Fig. 6. Acanthella. Longitudinal section through a part of a funis, 
which is composed of numerous funiculi (f); spicules not entirely imbedded. 
in spongin. 
Fig. 7. Acanthella. Transverse section through a part of a funis. 
Fig. 8. Raspaiha. id. 
Fig. 9. Phakellia. id. 
Fig. 10. Axinella. id. 
Plate 16. 
Fig. 1. Phacanthina. Part of skeleton. 10:1. 
Fig. 2. Phacanihina. Skeleton. Natural size. 0 Outline of the 
sponge. 
Zool. Jahrb., Suppl. XV (Festschrift für J. W. Spengel Bd. ]). 21 
