AND PHTSIOLOaT OF THE SPONOIAD^. 
835 
spiculum. They are found thickly clustered around the primary spicula of the skeleton. 
They differ essentially from porrecto-ternate spicula in having both ends cleft or radiate, 
which is never the case in any of the ternate forms. 
Explanation of PLATE XXXVI. 
Spicula of the Skeleton. 
Fig. 1. Faecimulo-cylindeical, from Spongilla coralloides^ Boweebank, MS., xl08 
linear: page 830. 
Fig. 2. Inequi-aceeate veemiculoid, from Hymeraphia vermiculata., Boweebank, MS., 
Xl75 linear: page 830. 
Fig. 3. Nodulated CYLiNDEicAL VEEMicuLOiD, x 175 linear: page 830. 
Fig. 4. Elongo-equiangulated teieadiate, from Grantia striatula, Boweebank, MS., 
Xl08 linear: page 830. 
Fig. 5. Exflected elongo-equiangulated teieadiate, from Grantia striatula, Bowee- 
bank, MS., X 108 linear: page 830. 
Fig. 6. Doliolate cylindeical, x 175 linear: page 830. 
Fig. 7. Bifuecated expando-teenate, x 108 linear: page 830. 
Fig. 8. PoEEECTO-TEENATE, xl08 linear: page 830. 
Fig. 9. Expando-teenate, x 108 linear: page 830. 
Fig. 10. Genicul.\ted expando-teenate, from Tethea Collmgsii, Boweebank, MS., 
X 108 linear: page 831. 
Fig. 11, Abbeeviato-pAtento-teenate, x 108 linear: page 831. 
Defensive Spicula. 
Fig. 12. Inflato-fusifoemi-aceeate, ascendingly hemi-spinous, x 108 linear: page 831. 
Fig. 13. Veeticillately spined cylindeical, x666 linear: page 831. 
Fig, 14. Sub-attenuato, entieely spined cylindeical, x 400 linear: page 831. 
Fig. 15. Spiculated inequi-angulated teieadiate, with cylindeical entieely spined 
EAD ii, X 308 linear: page 831. 
Fig. 16. Spicul.\ted attenuato-equiangulae teieadiate, veeticillately spined, X 666 
linear: ^^1- 
Fig. 17. Spiculated cylindeo-equiangulae teieadiate, veeticillately spined, x 666 
linear: page 831. 
Figs. 18 & 19. Inequi-fuecato-teieadiate, x 183 linear : page 831. 
Fig. 20. Elongo-eecuevate DENTATO-BiEOTULATE, X 308 linear: page 832. 
Fig. 21. Elongo-eecuevate dentato-bieotulate, x 308 linear: page 832. 
Fig. 22. Eecuevo-acutely DENTATE BiEOTULATE, X 308 linear: page 832. 
Fig. 23. Kecueyo-dentato-bieotulate vaeiety, x 308 linear: page 832 
MDCCCLXII. 5 X 
