

REVISION "BRITISH SPONGIAD^E." 183 



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

 ,, ptimila, B., VI, (Haeckel, 6, p. 148). 



,, somesi, B., XCI. 



Class II. SI LICE A, Gray. 

 Sub-class I. TRIAXONIA, Schulze. 



1. Order HEXACTINELLIDA, Schmidt. 



None. 



2. Order HEXACEBATINA, Lendenfeld. 



Halisarca dujardini, Johnston. (Schulze, 16.) 



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

 believe in the existence of 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 by 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 Hymeniacidon gelatinosa. Norman enumerates 

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



Sub-class II. TETRAXONIA, Schulze. 

 a. Order TETKACTINELLLDA, Marshall. 

 1. Sub-order: CHORISTIDA, Sollas. 



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

 las, 17, p. 51.) 

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



(Sollas, 17, p. 98.) 

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

 las, 17, p. 108). 

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

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



