296 PLATE LXXXVL 



Fig. 12. A view of one of the best developed rotulse 

 from 8. Parfitti. X 530 linear. 



Fig. 13. Two views of a rotulate spiculum from an 

 ovary of Spongilla fluviatilis for comparison with those 

 of 8. Parfitti. X 530 linear. 



Fig. 14. An average-sized spiculum from an ovary 

 of Spongilla Meyeni from Mr. Carter. X 530 linear. 

 Exhibiting the great difference in size as compared 

 with the similar organs from 8. fluviatilis and 8. 

 Parfitti. 



SPONGILLA SCEPTRIFEEA, Bowerbarik. 



Fig. 15. Represents the type specimen from one of 

 the Exeter reservoirs. Natural size. 



Fig. 16. One of the acerate skeleton spicula. 

 X 250 linear. 



Fig. 17. Represents one of the minute sceptriferous 

 tension spicula from the interstitial membranes. 

 X 530 linear. 



CIOCALYPTA LEEI, BowerbanJc. 

 Plate LXXXVL 



Sponge sessile, thinly coated, furnished with one 

 or more long, slender, pellucid, conical, penicillate 

 organs. Surface smooth. Oscula simple, minute, 

 dispersed on the conical penicillate organ. Pores nume- 

 rous, congregated in the areas of the dermal reticu- 

 lations. Dermal membrane of the basal portion abun- 

 dantly spiculous ; spicula dispersed, acuate like those 

 of the skeleton ; dermal membrane of the penicillate 

 organ reticulated ; rete polyspiculous, strong, and open. 

 Skeleton. Spicula acuate, rarely sub-fusiformi acuate, 

 variable in size. 



Colour. In the dried state ; white. 



Habitat. Ilfracombe ; Mr. Henry Lee. 



Examined. In the dried state. 



