PLATE 14. 



Sidonops angulata Lendenfeld. 



Figs. 1-4, 18, 19. ■ — var. megana Lendenfeld (lobose form). 

 Figs. 5, G, 16, 17, 20-22. — var. megana Lendenfeld (massive form). 

 Figs. 7-9. — var. microana Lendenfeld. 



Figs. 10-15, 23-30. ■ — var. orthotriaena Lendenfeld. 



1-15. — Microsclercs from centrifugal spicule-preparations; magnified 300: 

 1, 5, 7, 8, u. v. phot. Zeiss, q. monoclir. 6, q. oc. 7; 

 2-4, 6, 9-15, u. V. phot. Zeiss, q. monochr. 1.7; 

 1-4, from the lobose specimen of var. megana; 

 5, 6, from the massive specimen of var. megana; 

 7-9, from var. microana; 

 10-15, from var. orthotriaena] 



a, small oxysphaerasters with large centrum; b, large oxyasters without centrum; c, 

 young sterrasters; d, strongylosphaerasters ; e, intermediate oxyasters (oxysphaer- 

 asters) with small centrum. 



16. — A small oxysphaeraster of the massive specimen of var. megana; magnified 1800; u. v. phot. Zeiss, 



q. monochr. 1.7, q. oc. 10. 



17. — Two strongylosphaerasters of the massive specimen of var. megana; magnified 1800; u. v. phot. 



Zeiss, q. monochr. 1.7, q. oc. 10. 



18. 19.- — A strongylosphaeraster with few, irregularly distributed, fully developed rays, of the lobose 



specimen of var. megana; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 

 18, focused higher; 19, focused lower. 



20. — Radial section through the dermal membrane of the massive specimen of var. megana; haematoxy- 



lin; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 



a, surface of the sponge; b, conspicuous, granular, subdermal cells; c, asters protruding 

 beyond the surface. 



21. — Radial section through the choanosome of the massive specimen of var. megana; azure; magnified 



200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 a, flagellate chambers; c, asters. 



22. — Radial section through the cortex of the massive specimen of var. megana; azure; magnified 200; 



phot. Zeiss, apochr. 8, compens. oc. 6: 



a, fibrous inner cortical layer; b, subcortical cavity; c, asters, protruding into the subcorti- 

 cal cavity. 



23. — Small oxysphaeraster of var. orlhotriaena; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. 



oc. 10. 



24. — Large triactine oxyaster with rudiment of a fourth ray of var. orthotriaena; magnified 1800; u. 



V. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 

 25-30. — Strongylosphaerasters of var. orlhotriaena; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, 

 q. oc. 10: 



25, part of a regular strongylosphaeraster with cylindrical rays; 



26, a strongylosphaeraster with somewhat irregularly distributed, cylindrical rays; 



27, 28, two views of a regular strongylosphaeraster with somewhat conical rays; 



27, focused higher; 28, focused lower; 

 29, 30, two views of a strongylosphaeraster with only one fully developed ray; 

 29, focused higher; 30, focused lower. 



