284 records of the australian museum. 



Sub-family GHALININ^. 



Pachychalina tenella, Lendenjeld. 



Pachychalina tenella, Dendy, Proc. Roy. Soc. Vict., new ser., vii., 



1895, p. 242. 

 Chalinopora tenella, Lendenfeld, Zool. Jahrbiicher, ii., 1887, p. 

 765. 



The specimen bearing the above name (No. 249) consists of a 

 series of main and secondary branches, which arise from a small 

 but incomplete basal plate ; the example is 250 mm. in height and 

 200 mm. in width. The branching is dichotomous, and the ends 

 are usually swollen ; they measure 10 mm. in their shorter, and 

 from 15 to 25 mm. in their longer diameter. The oscula are 

 confined to the summits and inferior surfaces of the branches ; 

 they vary from 3 to 5 mm. in diameter. The dermis is very finely 

 reticulated and minutely porous. The internal skeleton consists 

 of a loose open network. In texture the sponge is soft, easily 

 compressible, and elastic ; colour, in the dried condition, dull 

 yellowish gray. The main fibres are 007 mm. in diameter, and 

 0'3 to 005 mm. apart ; the stouter secondaries are 0'03 to 0'04 

 mm. in diameter, and 0'03 to 004 mm. apart. The spicules in 

 the main and secondaries fibres are numerous, closely packed, and 

 occupy nearly the whole of the fibre. In the more slender con- 

 necting fibres the spicules vary from 1 to 6 in a row. 



Megascleres — Oxea, size 0-09 to 0-1 mm.by 0-0015to00025mm. 



Pachychalina manus, Lendenfeld. 



The named example (No. 282) consists of a series of primary 

 and secondary branches, which usually attain to the same level. 

 Apically they are somewhat dilated, and frequently anastomose. 

 The oscula are about 1 mm. or less in diameter ; they are scattered 

 over the branches generally ; at and near the summit they are 

 situated in the centre of dimple-like depressions, which gives the 

 upper aspect a peculiar appearance characteristic of the species. 

 The example measures 110 mm. in height, 70 mm. in width, and 

 30 mm. in thickness ; the individual branches vary from 4 to 10 

 mm. in diameter. 



The spicules are oxea 0'05 to 006 mm. in length, and 0"004 to 

 0005 mm. in diameter. 



No. 438 in the collection does not agree with the description. 



The British Museum specimen exhibits numerous oxea in the 

 fibres, and also in the ground substance ; those in the latter 

 measure 0-07 by 0004 mm., and in the former 0*08 by 0005 mm. 



Chalina globosa, Lendenfeld. 



This species has been described in the report" previously 

 referred to. 



5 Whitelegge— Rec. Aust. Mus., iv., 2, 1901. 



