PLATE XXXVIII. 
PAGE 
Kgs. 1-12. Psammastra murrayi, . . . .175 
Figure 1. Sponge j nat. size. 
„ 2. Vertical section ; nat. size. 
„ 3-12. Spicules — 
Fig. 3. Plagiotrisene ; x 73. 
,, 4-9. Various forms assumed by the cladome of 
the plagiotriaene ; x 180 (except fig. 
4, X 292). 
Fig. 10. Microstrongyles ; x 430. 
„ 11. Oxyaster ; x 430. 
„ 12. Spheraster ; x 430. 
Figs. 13-17. Tetilla coronida, .... 9 
„ 13, 14. The sponge, nat. size ; fig. 13, seen from above; fig. 14, lateral view. 
,, 15-17. Spicules — 
Fig. 15. Protrisene ; 180. I Fig. 17. Cladal end of anamonsene ; x 180. 
„ 16. Cladal end of anatriaene ; x 180. | 
Figs. 18-27. Piloelirota 'pachydermata, . . . .122 
„ 18, 19. The sponge ; nat. size. 
„ 20-23. Spicules — 
Fig. 20. Oxea ; x 73. I Fig. 22. Anatrisene ; x 73. 
,, 21. Orthotri»ne; x 73. | ,, 23. Chiaster. 
„ 24. Superficial tangential section from the surface of the sponge, showing in the middle a sieve- 
pore. The epithelial outlines are not seen in the preparation, and are only introduced to 
indicate the position of the epithelium ; x 200. 
„ 25. Section at right angles to the surface, showing the characters of the cortex and of the 
incurrent chones ; x 51. 
„ 26. One side of a median longitudinal section through an oscular chone ; x 73. 
„ 27. A more magnified representation of the outer layer of the lower part of the preceding, .to 
show the supposed lesthocytes beneath the epithelium ; x 292. 
Figs. 28-30. Callipdta ornata^ . . . . ■ 309 
„ 28, 29. Two of the discotriaenes ; x 292. 
,, 30. Amphiaster ; x 430. 
^ In the legend at the foot of the Plate this is Gorallistes callvpelta, the name having been changed since the Plate 
was printed off. 
