88 Froceediiuj^ of the Royal Society of Victoria. 



In canal system, so far as we can judge tVom the author's 

 description, this species appears to ieseml)le my Grantia 

 vosmaeri, the radial chambers communicating with the 

 gastral cavity by elongated exhalant canals. 



Locality. — Port Jackson (von Lendenfeld). 



19. Grantia votsmaerl, n. sp. 



Specimen solitary, sessile (?), sac-shaped, tapering gradually 

 above to the naked, terminal osculum ; 15 mm. high and 



7 mm. in greatest transverse diameter. Texture hard, 

 dermal surface echinated by the large, projecting oxea. 

 Wall of sac only about 1 mm. thick. 



The dermal cortex is very strongly developed, about 



008 mm. thick ; the gastral cortex is two or three times 

 as thick, but less dense and not so well-defined. The radial 

 chambers are rather short and moie or less branched. Their 

 distal ends abut against the dermal cortex, while proximally 

 they communicate with the gastral cavity by means of long, 

 wide, exhalant canals, which penetrate the gastral cortex 

 and may unite together before opening onto the gastral 

 surface. The chambers are sepai-ated trom the exhalant 

 canals by constricted diaphragms. The inhalant pores take 

 the form of irregular canals penetrating the dermal cortex. 



Except for the unusual thickness of the cortex and the 

 great size of the oxeote spicules the skeleton is ari'anged 

 in the ordinary manner. The spiculation is as follows : — 



(1) Gastral quadriradiates ; usually more or less sagittal, 

 but very variable ; rays straight or paired raj's slightly 

 curved, stout, conical and gradually sharp-pointed ; size 

 very variable ; paired rays averaging, say, about 2 by 

 0-02.5 mm. ; basal ray about the same thickness and usually 

 somewhat longer ; a})ical ray thorn-like, short, stout, conical, 

 u.sually slightly curved, finely pointed, about 0"07 mm. long, 

 projecting into the gastral cavity and exhalant canals. 



(2) Gastral triradiates ; usually like tlie foregoing but 

 without the apical ray ; towards the osculum, however, 

 they become much more strongly and regularly' sagittal, 

 the widespread, slightly recurved oral rays being much 

 longer and stouter than the basal ray ; amongst these 

 suboscular spicules quadriradiates are very rare. (3) 8ub- 

 gastral sagittal trii-adiates ; indistinguishable from the 

 remainder of the tubar skeleton, which merges somewhat 

 gradually into the gastral cortex. (4) Tubar trii-adiates ; 



