274 A MONOGRAPH OF THE 



Section * * Skeleton spicula, acuate. 



Sub-section A, Skeleton spicula, smooth. 



29. Isodictya infundibuliformis, Bowerbank. 



30. — dtssimilis, Bowerbank. 



31. — Normani, Bowerbank. 



32. — fucorum, Bowerbank. 



33. — Alderi, Bowerbank. 



34. — Edwardii, Bowerbank. 



35. — lobata, Bowerbank. 



36. — paupera, Bowerbank. 



37. — uni/ormis, Bowerbank. 



38. — Clarhei, Bowerbank. 



39. -^ gracilis i Bowerbank. 



40. — Barleei, Bowerbank. 



Sub-section B, Skeleton spicula, spinous. 



41. Isodictya Beanii, Bowerbank. 



42. — lurida, Bowerbank. 



43. — Jlmbriata, Bowerbank, 



1. Isodictya cinerea, Bowerbank. 



Spongia cinekea, Oraat. 

 Halichondria cineeea, Fleming. 

 — — Johnston. 



Spougia SoiraEBii, Fleming. 



Sponge. Coating; surface even, smooth. Dennal mem- 

 brane pellucid, aspiculous. Oscula simple, dispersed, 

 few in number. Pores inconspicuous. Skeleton 

 unispiculous, spicula acerate, rather long and stout. 

 Interstitial membranes. Tension spicula slender, few 

 in number. Gemmules membranous, aspiculous. 



