126 BRITISH SPONGlADiB. 



28. IsoDioTTA Ingalli, Bow., Ill, 241, PI. LXXXVIII, 



figs. 1 — 5. 



29. ISODICTTA INCEETA, Bow., Ill, 314, PI. LXXXIX, 



figs. 3, 4. 



80. IsoDiCTTA OEASSA, Bow., n. sp., IV, PI. VIII, figs. 

 4—6. 



" Sponge massive, sessile ; furnished with large 

 tumulous cloacae. Surface smooth. Oscula simple, 

 within the cloacEe. Pores inconspicuous, dispersed 

 within the dermal rete. Dermal membrane pellucid, 

 furnished with a stout irregular reticulation ; spicula 

 subfusiformi-acerate, same size as those of the skeleton. 

 Skeleton very open and diflFuse, irregular ; primary 

 lines multispiculous ; secondary lines varying from 

 multispiculous to unispiculous ; very irregularly dis- 

 posed. Spicula subfusiformi-acerate. 



" Colour. — In the dried state, milk-white. 



"Habitat. — "Westport Bay, Island of Innisgowla, 

 under stones ; Rev. A. M. Norman. 



" Exarmned. — In the dried state. 



" I received three specimens of this species of sponge 

 for examination. The largest is three inches in length, 

 one and a quarter in breadth, and about one inch in 

 thickness ; the other two were much smaller, but all 

 possessed the strongly developed tumulous character 

 of their surfaces, and all three had been located on 

 small branching fuci. The tumulous cloaca on the 

 largest specimen were short and stout, not exceeding 

 about half an inch in height, and the excurrent orifices 

 were about two lines in diameter. When a thin slice 



