BY E. F. KALLMANN. 443 



(and, as a rule, slightly angulately) curved, the oxea symmetri- 

 cally so, the anisoxea only in their basal moiety. The shortest 

 and slenderest spicules are invariably oxea, the longest and 

 stoutest, anisoxea; those of intermediate dimensions include both 

 oxea and anisoxea, and all possible gradations between them. 

 Many of the slenderest oxea are (gradually) sharp-pointed at 

 both ends, and most of the anisoxea are (somewhat abruptly) 

 either sharp-pointed or more or less bluntly rounded off at the 

 basal end; but, with these exceptions, the extremities of the 

 spicules are almost invariably surmounted by a cap of minute 

 spinules. Occasional spicules are stylote. 



{b.) Exceedingly rare, long, slender styli, tapering very gradu- 

 ally to a fine point at the apex, sometimes abruptly somewhat 

 pointed at the base, and measuring from about 550 to 1200 /u- in 

 length by 7 to 12 /x in stoutness. 



(c.) Small dermal styli, straight or variously bent or fiexuous, 

 either gi-adually or more or less abruptly sharp-pointed, and, in 

 the latter case, usually provided near the apex with a few minute 

 spines; measuring 190 to 280 /x in length by 3 to 5 /x in stoutness. 



Loc. — Western Australia. 



Remarks. — In the British Museum, in addition to a specimen 

 of this species (labelled '■''Reniochaliiia stalagmites'' ), there occur 

 two further examples of the genus Axiamon, labelled respectively 

 "• Reniochali7ia spiculosa Port Jackson," and ^^ Reniochalina 

 arhorea^ New Zealand." These haveoxeote and anisoxeote mega- 

 scleres of almost or quite identically the same size and form as 

 those of the type-species, but they appear to be etitirely lacking 

 in the other kinds of spicules. The former, of which I have seen 

 only a small fragment, is apparently not widely different in 

 surface-features from the typical specimen of A. folium: but the 

 latter— which is represented also in the Australian Museum, by 

 an almost complete specimen- has a peculiar densely conulose 

 surface, and is obviously a quite distinct species. 



For Reference List of Literature, see aiitea, pp.310-3L5. 



