110 BEITISH SPONGIAD^, 



are of very rare occurrence. A very few inequi-pal- 

 mato-anchorate spicula were detected among the 

 spicula separated by boiling in nitric acid, but I could 

 not detect tbem in situ ; tbey are remarkable in their 

 form, though very minute, the palmate portion being 

 quite half the length of the spiculum." 



27. Halichondeia inceustans, Esper, ii, 249 ; iii, 108, 



PI. XLIV, figs. 7—12. 



1867 Dendoryx inerustoms. Gray. Proc. Zool. Soc, p. 535. 

 1874 HaMehondna incrustans, Carter. Aim. Nat. Hist., ser. 4, 

 vol. xiv, pp. 2 — 4. 



Habitat. — Budleigh-Salterton, Carter. Birterbuy 

 Bay, Galway; Jersey; Guernsey; Polperro, Corn- 

 wall (N".). It is essentially a low-water-mark species, 

 generally distributed round our coast. 



28. Halichondeia oandida, Bow., ii, 251 ; iii, PI. 



XLIV, figs. 13—16. 



1867 Biemma Candida, Gray. Proo. Zool. Soc, p. 539. 



29. Halichondeia ieebgulaeis, Bow., ii, 252; iii, PL 



XLIV, figs. 17—21. 



1867 Dendoryx irreguhms, Gray. Proc. Zool. Soc, p. 636. 



30. Halichondeia Diokiei, Bow., ii, 263 ; iii, PI. XL V 



figs. 1—6. 



1867 Dendoryx DioMei, Gray. Proc. Zool. Soc, p. 536. 



nabitat. — On Cellepora cervicornis, deep water, 

 Shetland Seas, 1863; Polperro (N".). 



