REPOET ON THE MONAXONIDA. 25 



consistence. It is important to observe that though the oscula are confined to one surface 

 of the frond, the pores occur on both. 



ioca^.— Station 1G2, April 2, 1874; kt. 39° 10' 30" S., long. 146° 37' 0" E. ; 

 Bass Strait; depth, 38 fathoms; bottom, sand and shells. One specimen. 



Pachyclialina (?) pedunculata, Eidley and Dendy (PL V. fig. 5). 



1886. Pachychalina (?) pedunculata, Eidley and Dendy, Ann. and Mag. Nat. Hist., ser. 5, 



vol. xviii. p. 329. 



Sponge (PI. V. fig. 5) erect, stipitate, cylindrical ; tapering to a blunt point above, 

 and with a short, rather stout stem attached to a worm tube. Total height about 127 mm., 

 diameter of body a little over 18 mm. ; of stalk 6 mm. Colour in spirit greyish- 

 yellow. Texture very soft and spongy, fairly elastic. Surface even, very minutely 

 hispid ; readily fraying out into tags. Dermal membrane very thin and delicate. 

 Oscula rather small, scattered. 



Skeleton. — Composed of loose fibres and scattered spicules, the main fibres only distinct, 

 running vertically to the surface. No special dermal skeleton. Fibres very loose, main 

 about six spicules broad. Only a small amount of spongin present. 



Sjncules. — Eather slender, slightly curved, gradually and sharply pointed oxea ; size 

 about 0-5 by 0-017 mm. 



This species resembles in several respects Vosmaer's Pachychalina caulifera,^ but it is 

 cylindrical instead of flattened, and the shape of the spicules is difi"erent, being slender 

 instead of broadly fusiform. The fibres in Pachychalina caulifera appear to contain a 

 good deal more spongin than in the present species ; indeed, it is only doubtfully that we 

 include the latter in the genus at all; it forms another connecting link between the 

 Renierinae and Chalininae, and shows how little value can be placed upon the amount of 

 spongin present for purposes of classification. 



Locality. — Kerguelen Island, 10 to 100 fathoms. One specimen. 



Genus CJialina, Grant (Pis. V., XLVL). 



1861. Chalina, Grant, Tabular View of the Animal Kingdom, p. 76. 



Form various, not tubular, surface smooth. Skeleton reticulation rectangular, with 

 much spongin and few spicules ; fibres typically slender, with a single axial series of 

 spicules. 



Concerning the name CJialina, we quote as follows from the " Alert " Report : — " This 

 genus was merely mentioned by name in Grant's Tabular View of the Animal Kingdom 



1 Eeport on the Sponges dredgedup in the Arctic Sea by the "WiUem Barents," in the years 1878 and 1879, p. 33, 

 pi. i. fig. 14 ; pi. iii. figs. 64-66. 



(ZOOL. CHALL. EXP. — PAET. LIX. 1887.) ^^^ ^ 



