BY E. F. KALLMANN. 357 



Stylotella RIGIDA. 



The specimen labelled as the type of this species (under the 

 MS. name ''Trancatella riykla'), as well as a fragment labelled 

 Stylotelhi, riyida from the British Museum, are specifically the 

 same; and, in skeletal characters, accord with Lendenfeld's 

 description ; but in one conspicuous feature attributed to Sty- 

 lotella riyida — viz., the possession of oscula 1 to 3mm. in 

 width, and situated at the extremities of the digitate processes 

 - -they are completely lacking. As a matter of fact, they are 

 examples of Stylotella ayniinata Ridley. One is justified in 

 concluding, therefore, that the description of Stylotella riyida 

 confounds the external features of one species with the inter- 

 nal features of another, the latter being that represented by 

 the type-specimen ; and as the former is unknown and indeter- 

 minable, we may, accordingly, look upon S. riyida as, in effect, 

 a synonym of ^S'. ayniinata. An independent reason for sus- 

 pecting that some such mistake as this was made in connection 

 with jS'. riyida, is afforded by its specific name, the implication 

 of which is in direct contradiction to Lendenfeld's definition of 

 the genus Stylotella as "Heterorrhaphidge of very soft tex- 

 ture." 



Dendy(14) has mistakenly referred to this species, under the 

 name Kymeniacidon riyida, a sponge from Port Phillip. As 

 the description given of the latter is sufficient for its identifica- 

 tion, I propose that it be called Hymeniacidon victoria na. 



Stylotella aplysillioides. 



The specimen preserved in the Australian Museum as the 

 supposed type of this specieg — for the reason that it is labelled, 

 in Lendenfeld's handwriting, with the name ("Truncatellina 

 cinerea") given in the key-list as the manuscript synonym of 

 Stylotella aplysillioides — is a small, very thinly incrusting 

 sponge, apparently belonging to the genus Mycale, with a thin 

 dermal layer of foreign particles, and a main skeleton consist- 

 ing (i.) of unconnected ascending fibres composed of foreign 



