PLATE XCIV. 



PAGE 



Hexactinella lata, F. E. S., . . 329 



Fig. 1. A specimen preserved in alcohol ; natural size. 



Fig. 2. Macerated dictyonal skeleton (framework) of a fragment, from a photo- 

 graph ; natural size. 



Fig. 3. Transverse section of a tube ; natural size. 



Fig. 4. Uncinatum ; x 300. 



Fig. 5. Dermal scopula with six geniculate knobbed prongs ; x 300. 



Figs. 6, 7. Sphserohexasters ; x 450. 



Fig. 8. Dermal scopula with four straight knobbed prongs ; x 300. 



Fig. 9. Dermal scopula with four straight pointed prongs ; x 300. 



Fig. 10. Oyhexaster with straight, slender, terminal rays; x 450. 



Fig. 11. Sphserohexaster with S-shaped terminal rays ; x 450. 



Fig. 12. Oxyhexaster with long principal rays ; x 450. 



Fig. 13. Sphserohexaster with middle-sized principal rays ; x 450. 



For " Tretodictyum latum " on the Plate read " Hexactinella lata " ; see note on last 

 Plate. 



