260 DK. HINDE AND MK. HOLMES ON SPONGE- REM A^INS 



Plate XII. 



Figs. 1, 2. Two forms of flask-shaped flesh-spicules of iai!;;'M?iczi^/« (v). X 600. 

 Fig. 3. Spined barrel-shaped flesh-spicule of Thoosa (a). X 600. 

 Figs. 4, 5. Spirular flesh-spicules of Spirastrella (a). X 600. 



6, 7. Spirular flesh-spicules of Spirasirella (b), (c). X 600. 



8, 8 a. Spirular flesh-spicules of Pronax (a). X 300. 

 Fig. 9. Spined spirular spicule of Pronax (b). X 600. 



10. Candelabrum spicule of Corticimn with inflated head-rays. X 600. 



11. Smaller candelabrum with similar head-rays to fig. 10. X 600. 



12. Candelabrum spicule of Corticiuni (b) with obtusely-pointed head-rays. 



X 600. 

 Figs. 13, 13 a, 14, 15. Candelabra spicules of Corticium (b) with mitre-like sum- 

 mits and varying number of basal rays. X 600. 

 Fig. 16. Candelabrum with quadripartite head-rays of Corticium (c). X 600. 



17. Candelabrum with simple head-rays of Corticium (d). X 600. 

 Figs. 18, 19. Candelabra spicules, with extended basal rays, of Corticiiim (e). 

 X600. 

 20, 21. Candelabra spicules of Plakina australis. X 600. 

 22, 23, 24. Modified stellate spicules of Corticium (?). Figs. 22, 23 X 600 ; 

 fig. 24 X 300. 

 . , 25, 26, 27. Modified small calthrops spicules of Corticium. Figs. 25, 27 

 X 300 ; fig. 26 X 600. 

 28-32. Modified calthrops (?) spicules of Corticiiim (?). Figs. 28, 30 X 

 300; figs. 29, 31, 32 X 600. 

 Fig. 33. Small globostellate, with spined truncate rays, of Stelletta ? X 600. 

 Figs. 34, 35. Trifid spicules of Bitricenella Oamaruensis, n. g. et sp. x 200. 

 Fig. 36. Trifid spicule of Ditricsnella (a), x 600. 



37. Spined calthrops spicule of undetermined sponge. X 600. 



Plate XIII. 



Figs. 1, 2. Fusiform acerate spicules of Geodites and Stelletta. X 20. 

 3, 4, 5. Trifid skeletal spicules of Geodites (a). X 20. 

 6, 7, 8. Different forms of trifid spicules of Geodites (b). Fig. 6 X 20 ; 



figs. 7, 8 X 40. 

 9, 10. Trifid skeletal spicules of Stelletta (a). Fig. 9 X 20; fig. 10 X 40. 

 11-15. Difl'erent forms of trifid spicules of Geodites or Stelletta. Fig. 11 



X 50; figs. 12-15 X 20. 

 16, 17. Forked trifid spicules. Fig. 16 X 60 ; fig. 17 X 20. 

 Fig. 18. Anchor trifid spicule of Thenea (a). X 100. 

 19. Anchor trifid spicule of Geodites (a). X 20. 

 Figs. 20-24 a. Diff'ereut forms of anchor trifid spicules. Fig. 20 X 20 ; fig. 21 

 X 40; fig. 22 X 100; figs. 23, 24 X 50 ; fig. 24 a X 200. 

 25, 26, 27. DiflFerent forms of lithistid skeletal spicules of Lyidium (a). 

 X40. 



