102 PLATE XLI. 



size. The two specimens are connected by the fibres 

 of the Zoophyte on which they have grown. 



Fig. 11. A skeleton spicnlum. X 250 linear. 



The Rev. A. M. Norman found this species at 

 Strangford Lough, October 8th, 1869. The specimens 

 were preserved in spirit as they came from the sea. 

 They were of a dark-green colour, and were remark- 

 ably soft and flexible. 



HALICHONDEIA INCONSPICUA, Bower bank. 



Vol. ii, p. 236, ' Mon. Brit. Spongiadse.' 



Fig. 12. Represents "the type-specimen from St. 

 Catherine's Rock, at Tenby. Natural size. 



Fig. 13. One of the skeleton spicula. X 250 

 linear. 



Fig. 14. A tension spiculum from the interstitial 

 membranes. X 250 linear. 



HALICHONDEIA INCERTA, Bowerbanft. 



Vol. ii, p. 237, ' Mon. Brit. Spongiadse.' 



Fig. 15. Represents the type-specimen from 

 Guernsey thinly coating a balanus. In the cabinet of 

 the Rev. A. M. Norman. Natural size. 



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

 X 250 linear. 



Fig. 17. One of the slender, acerate, tension 

 spicula, from the dermal membrane. X 250 linear. 



HALICHONDRIA COALITA, Johnston. 



Vol. ii, p. 238, ' Mon. Brit. Spongiadse.' 



Fig. 18. Represents the specimen from Sheppey 

 presented to me by Dr. Grant. Natural size. 



Fig. 19. One of the skeleton spicula. X 250 

 linear. 



Fig. 20. One of the subfusiformi, acerate spicula, 

 from the dermal membrane. X 250 linear. 



