296 PLATE LXXXVI. 



Fig. 12. — A view of one of tlie best developed rotul^ 

 from 8. Parfitti. X 530 linear. 



Fig. 13. — Two Aaews of a rotulate spiculum from an 

 ovary of Spongilla fluviatilis for comparison with those 

 of 8. Parfitti. X 630 linear. 



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

 of 8iJongilla Ifeyeni from Mr. Carter. X 530 linear. 

 Exhibiting the great difference in size as compared 

 with the similar organs from 8. fluviatilis and 8. 

 Parfitti. 



SrONGiLLA SCEPTEIFEEA, Botvevhank. 



Fig. 15. — Represents the type specimen from one of 

 the Exeter reservoirs. Natural size. 



Fig. 16. — One of the acerate skeleton spicula. 

 X 260 linear. 



Fig. 17. — Represents one of the minute sceptriferous 

 tension spicula from the interstitial membranes. 

 X 530 linear. 



CiocALYPTA Leei, Bowerbanh. 

 Plate LXXXVI. 



Sponge sessile, thinly coated, furnished with one 

 or more long, slender, pellucid, conical, ^^enicillate 

 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. 



C'oloiir. — In the dried state ; white. 



Habitat. — Ilfracombe ; Mr. Henry Lee. 



Examined, — In the dried state. 



