EE VISION "BEITISH SPONGIADiE." 239 



Leucandra nivea, Grant, V, (Haeckel, 6, p. 211). 

 „ pumila, B., VI, (Hgeckel, 6, p. 148). 



,, somesiy B., XCI. 



Class 11. S] LICE A, Gray. 

 Sub-class I. TRIAXONIA, Schulze. 



1. Order HEXACTINELLIDA, Schmidt. 



None. 



2. Order HEXACEEATINA, Lendenfeld. 



Halisarca dujardini, Johnston. (Schulze, 16.) 



Note. Bowerbank (see Vol. II, p. 225) never seemed to 

 believe in the existence oi Halisarca dujardini, as des- 

 cribed by Johnston. It is difficult to imagine that B. 

 never met with that sponge. For some time I 

 thought that his Hymeniacidon dujardini, XXXVIII 

 and H. gelatinosa, XXXVIII might have been certain 

 spiculiferous sponge remains overgrown hy Halisarca. 

 But since Topsent {18, p. 99) describes the former of 

 the two sponges under the name Dendoryx dujardini, 

 B., my supposition could be true only with regard 

 to Hyme7iiacidon gelatinosa. Norman enumerates 

 H. dujardini in the Appendix to Vol. IV, p. 238. 



Sub-class II. TETRAXONIA, Schulze. 

 a. Order TETKACTINELLIDA, Marshall. 

 1. Sub-order: CHORISTIDA, Sollas. 



Craniella cranium, auctt., XIV and LXXXIX. (Sol- 

 las, 17, p. 51.) 

 Poecillastra compressa, B., IX, LXXII and LXXXI. 



(Sollas, 17, p. 98.) 

 Bercitus huchlandi, B., XXXVIII and XCII. (Sol- 

 las, 17, p. 108). 

 Stelletta coactura, B., LXXXII. (Sollas, 17, p. 184). 

 collingsi, B., XV. (Sollas, 17, p. 185), 



