346 REVISION OF THE MONAXONID SPONGES, 11., 



diameter, which is usually between 3 and 1 1 /x, may in rare 

 instances be as great as 1 8 /x. 



(c). The trichodragmata are fairly abundant, but are not readily 

 detected owing to their small size; they measure 12 /x long by 

 6 /x or less in diameter. The trichites composing them are 

 usually arranged in a somewhat confused fashion. 



Lor. — Port Jackson. 



Genus Reniochalina. 



No species identifiable with either of the two {^R. stalag- 

 mites and R. lanieUa) for which this genus was established, is 

 known to me. The two specimens purporting to be their types, 

 a brief description of which has been given by Whitelegge 

 (who seems to have been satisfied to regard them as the genu- 

 ine types), are quite irreconcilable with Lendenfeld's account 

 of the species, either in external features or in skeleton : as 

 they appear to me to be specifically identical (though possibly 

 of different varieties) and not to be assignable to any hitherto 

 established genus I have described them (in the Appendix to 

 this paper) under the name Axiamon folium. 



The specimens in question, it should perhaps be mentioned, 

 arc not labelled actually as Reniochalina stalagmites and 

 Reniochalina lamella, but as ^'Chalinodendron stalagmites'^ 

 and "Re?iiero2)la.x iatithella" — the latter names being those 

 given in the key-list as the manuscript synonyms of the for- 

 mer. However, among the fragments received from the 

 British Museum there is one labelled ''Reniochalina stalag- 

 mites," which is identically similar to "Chalinodendron stalag- 

 mites," as well as two others (of different species) labelled 

 respectively ''Reniochalina arhorea" and "Reniochalina spi- 

 culosa," which also are examples of the genus Axiamon. In 

 the face of these facts, I can only surmise that Lendenfeld 

 originally intended to employ the name Reniochalina for a 

 genus different from that for which finally he adopted it — and 

 for which presumably he considered it more appropriate. 



The genus Reniochalina was defined by Lendenfeld as fol- 

 lows: — "Lamellar, thin, branched, more or less flower-shaped 



