PLATE 14. 



Sidonops angulata Lendenfeld. 



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



Figs. 5, C, 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. — Microscleres from centrifugal spicule-preparations; magnified 300: 

 1, 5, 7, 8, u. V. phot. Zeiss, q. monochr. 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 (oxj'sphaer- 

 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, c]. oc. 10. 

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



2^iss, q. monochr. 1.7, q. oc. 10. 

 18, 19. — A strongj'losphaeraster with few, irregularly distributed, fully developetl rays, of the lobose 

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

 18, focu.-icd higher; li), 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 tlie sponge; b, conspicuous, granular, subdermal cells; c, asters protruding 

 Ix'yond 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. ortlu>triaena; magnified 1800: u. v. phot. Zei.ss, 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. — Strongj'losphaerasters of var. orthotriaena; magnified 1800: u. v. phot. Zeiss, q. monochr. 1.7, 

 q. oc. 10: 



25, part of a regular strongylosphaeraster with cyhndrical rays; 



26, a strongj'losphaeraster with somewhat irregularly distributed, cylindrical rays; 



27, 28, two views of a regular strongj'losphaeraster with somewhat conical rays; 



27, focused higher; 28, focused lower; 

 29, 30, two views of a strongj'losphaeraster with onlj* one fullj' developed raj'; 

 29, focused higher; 30, focused lower. 



