SPONGES. 



By Thomas Whitelegge. 



Zoologist, Australian Museum. 



Part I. — Addenda. 



The new species herein described are as follows : — 

 Paresperella repens. 

 Amphilectus munitus. 

 Dendoryx mirabilis. 



PARESPERELLA, Bendy. 



PARESPERELLA REPENS, sp. nov. 



(Plate xlv., fig. 22.) 



Station 44, 



Sponge incrusting and more or less permeating the whole sub- 

 stance of Dendoryx fusca, Whitelegge. Characters as usually 

 afforded to the naked eye or to a band lens are wanting, and it 

 is only by sections of the sponge {Dendoryx) that the organism 

 can be localized under the micioscope. Notwithstanding its 

 want of definite form it is quite evident and distinct in every 

 section examined. The union between the two sponges is so 

 complete that it is impossible to obtain a section of the Dendoryx 

 without abundant traces of the Paresperella. The spicular 

 characters of the latter are sufficiently definite and distinct to 

 warrant a description of it as a new species. 



The choanosome is rather dense and pale yellow in colour; it 

 is fully charged with tylota or tylostyli, serrated c-shaped spicules 

 and anisochelpe of two kinds, one large — always arranged in 

 rosetteti — the other small, and scattered throughout the sponge. 



The .skeletal characters are rather indefinite, but usually there 

 are indications of fibres consisting of five or six spicules in a row, 

 the rest are radiate or scattered through the body with the apical 

 portion of the spicules directed inwards. 



Megascleres :-~tylota or tylostyli narrowly fusiform with more 

 or less elongate oval ends ; the apex is often furnished with two 

 or thiee short spines, but usually both ends are evenly rounded. 

 Size :- 0-35 to 0-37 by 0006 mm. 



JVl icroscleres : — anisochelaj of two sizes, the larger kinds are 

 arranged in rosettes, the smaller are scattered. 



Sizes : — 0-038 and 001 mm. Serrated c-shaped spicules with 

 three teeth, directed backwards. Size 06 mm. 



This species differs from P. serratohamata, Carter, in the size 

 of the spicules and in wanting the curved toxa. 



