94 Pl.ATE XXXVII. 



Raphiodesma. floreum, BiYwerbfvnk. 



Hijmenincidoii, Jioreum. Vol. ii, p. 190, ' ilou. Brit. Spon- 

 giadie.' 



Fig. 14. — Represents tlie type-specimen from East 

 Loch, Tarbet Harris, N.B., presented to me by Capt. 

 F. W. L. Thomas, R. N. Natural size. 



Fig. 15. — One of the skeleton spicula. X 250 

 linear. 



Fig. 16. — A subclavate, fusiformi-acerate, tension 

 spiculum from the dermal membrane. X 250 linear. 



Fig. 17. — One of the large dentato-palmate, inequi- 

 anchorate, retentive spicula. X 530 linear. The 

 mode of the congregation of these sj^icula is repre- 

 sented in vol. i, plate xviii, fig. 2'J7, as tliey occur in 

 Ili/meniacidon lingua of that volume. 



Fig. 18. — One of the bidentate, inequianchorate, 

 retentive spicula. X 530 linear. 



Fig. 10. — A large contort, bihamate spiculum. 

 X 530 linear. 



This sponge was figured among the Hymeniacidons 

 before I had established the genus linphiodesma for 

 the reception of U. lingua and B. sordida, to both of 

 whicli species B. florewiu is closely allied by its struc- 

 tural peculiarities. 



HyMENIACIDON n.AVIGEEA, Tioirri'daa/r. 

 Vol. ii, p. 211, ' Mon. Brit. Spongiada?.' 



Fig. 20. — Represents the type-specimen in the 

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



Fig. 21. — One of the large, attenuato-clavato, or 

 spinulatc, skeleton spicula. X 80 linear. 



Fig. 22. — An attenuato-clavate, entiroly-spincd, 

 internal, defensive spiculum. ' X 250 linear. The 

 spination of the shaft of this spiculum has been acci- 

 dentally omitted. 



