REPORT ON THE MONAXONIDA. 27 



with the Spongia palmata referred to by Johnston ; ^ the hitter seems to be a 

 HomceodictyaJ 



Locality.— Station 18G, September 8, 1874; kt. 10° 30' S., long. 142° 18' E. ; 

 Torres Strait ; depth, 8 fathoms ; bottom, coral mud. 



Habitat. — Indian and European Seas (Lamarck) ; seas of New Holland (" var. (3 ") 

 (Lamarck) ; Torres Strait (Challenger) 



Chalina pergamentacea, Eidley (PL V. fig. 2). 



1881. GlaiJochaKna armigcra, var. iwrgamentacea, Ridley, Proc. Zool Soc. Lond., January, 



1881, p. 112, pL X. fig. 4. 

 1884. Cladochalina pergamentacea, Ridley, Zool. CoU. H.M.S. "Alert," Brit. Mus., p. 398. 



Eepresented in the collection by a single small, compressedly lobate specimen 

 (PI. V. fiig. 2) bearing a row of circular oscula of various sizes all round the margin. 

 The specimen is characterised by a very glabrous surface (very likely the surface of the 

 type would have been glabrous had it not been dried). The fibre is not so stout as in the 

 type, and the spicules are very much more abundant, and in the larger fibres arranged 

 polyserially. As the external form of this sponge is very characteristic, and has never yet 

 been figured, we give an illustration of it. 



ioca%.— Station 162, April 2, 1874; lat. 39° 10' 30" S., long. 146° 37' 0" E. ; 

 Bass Strait ; bottom, sand and shells. One specimen. 



Habitat. — Off the east coast of Brazil (Ridley, " Alert ") ; Torres Strait (Ridley, 

 " Alert ") ; Bass Strait (Challenger). 



Chalina rectangularis, Ridley and Dendy (PI. V. fig. 3; PI. XLVI. fig. 6). 



1886. Chalina rectangularis, Ridley and Dendy, Ann. and Mag. Nat. Hist., ser. 5, vol xviii. 



p. 331. 



Sponge (PI. V. fig. 3) sessile, encrusting, thin ; throwing up here and there low, 

 mound-like prominences, each of which normally bears a single osculum at the summit. 

 The single specimen covers half a valve of a Pec<c'?i-shell ; the crust is only slightly over 

 2 mm. in average thickness, except where the mound-like projections are situated ; these 

 rise to a height of about 4 mm. above the general surface. Colour in spirit pale yellow. 

 Texture rather compact, Ijut compressible and elastic ; tough and fibrous. Surface sub- 

 glabrous, microscopically granulated. Dermal membrane thin and transparent ; firmly 

 adherent to the underlying tissues. Oscula rather small ; at the summits of projections. 

 Pores, abundant, small, rounded openings through the dermal membrane ; averaging only 

 about 0"04 to 0"05 mm. in diameter, but varying rather in this respect. 



Skeleton. — (a) Dermal ; a very definite, polygonally-meshed reticulation of spicido- 



1 British Sponges, p. 92. 2 ggg ijelow under the subgenus Romoeodictya. 



