SILICIOUS AND HORNY SPONGES WILSON. 475 



the conuli are simpler than has been recorded for some individuals, 

 where they have been found to be dendritic (Lendenfeld, 1888; 

 Hentschel, 1912). These fibers are in the Albatross specimen simple, 

 slender, conical processes, sometimes divided near the apex, extend- 

 ing out from the edges of the radial skeletal bands. They bear no 

 relation to the intersection points made by radial fibers and con- 

 nectives, although in some other specimens (see Lendenfeld) they 

 originate from such points. 



Lendenfeld (1889, p. 683) recounts that this species has been 

 known since 1713, when it was first described by Petiver under the 

 name Rete phUUppense. It has been recorded from the Philippines, 

 Indian Ocean, Australian coast, Torres Straits, and the Aru Island?. 



IANTHELLA BASTA (Pallas). 



Spongia basta Pallas, 1766. p. 309. 



Ianthella bast a Lendenfeld, 1889, p. 695 (older synonymy given in de- 

 tail).— Topsent, 1920c, p. 316. 



Station D5139, pieces of fronds ("bands'" of Lendenfeld) and 

 one perfect frond 350 mm. long, 100-120 mm. wide, 2-3 mm. thick 

 exclusive of conuli. Edge of this frond terminally and in part along 

 both sides is the natural sharp edge of the sponge. 



Main fibers about 3 mm. apart, in general vertical but curving 

 more or less radially to the edge of the frond. Connectives trans- 

 verse in usual way and mostly 2-3 mm. apart. Conuli sharp, dis- 

 tributed along edges of main fibers on both sides of sponge, 1 mm. 

 or less high and 2-3 mm. apart. On one face the dermal membrane 

 is riddled with pores which make the impression of being in areas, 

 120-180 \y. in diameter, separated by narrow trabecular On the 

 other face are minute oscula a fraction of a millimeter in diameter, 

 typically in a single row between every two main fibers, and 

 1.5-3 mm. apart. Color in alcohol, reddish, shading off in places 

 toward yellow. 



The species has been recorded from the Indian Ocean and Aus- 

 tralian seas (Lendenfeld, 1889; Topsent, 1920c). 



Family SPONGELIDAE. 



Spongelidae Pole.taeff, 1884, p. 23. — Vosmaer, 1887, p. 362. — Part Lenden- 

 feld, 1889, p. 590. — Dendy, 1905, p. 207. — George and Wilson, 1919, p. 

 164. 



Spongelidae Authors plus Pleraplysillidae part Topsent, 1905, p. elxxxiv. 



Keratosa with eurypylous and large flagellated chambers, with a 

 skeleton composed of separate horny fibers that ascend from the base 

 of the sponge and are simple or branched, or the skeleton is more 

 commonly reticulate. Horny fibers without pith, generally contain- 



