274 A MONOGRAPH OF THK 



Section * * Skeleton spicula, acuate. 



Sub-section A, Skeleton spicula, smooth. 



29. Isodictya infundibuliformis, Bowerbank. 



30. dissimilis, Bowerbank. 



31. Normani, Bowerbank. 



32. fucorum, Bowerbank. 



33. Alderi, Bowerbank. 



34. Edwardii, Bowerbank. 



35. lobata, Bowerbank. 



36. paupera, Bowerbank. 



37. umformis, Bowerbank. 



38. Clarkei, Bowerbank. 



39. gracilis, Bowerbank. 



40. Barleei, Bowerbank. 



Sub-section B, Skeleton spicula, spinous, 



41. Isodictya Beanii, Bowerbank. 



42. lurida, Bowerbank. 



43. fimbriata, Bowerbank. 



I. Isodictya cinerua, Bowerbank. 



Spongia CINEREa, Grant. 

 Halichondria cinerea, Fleming. 

 Johnston. 



Spongia Sowerbii, Fleming. 



Sponge. Coating ; surface even, smooth. Dermal 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. 



