Syyiopsis of the AudraJUui Calcarea Heterocmla. 89 



strongly sagittal ; with widely extended, short, straight, 

 conical and gradually sharp-pointed oral rays, and much 

 longer, straight, gradually sharp-pointed basal ray; oral 

 rays about Ol by 0-()]5 mm.; basal ray about 0-28 by 

 0-0 15 mm. (5) Triradiates of the dermal cortex; usually 

 slightly sagittal but uearly regular ; rays stout, straight 

 or slightly curved, conical, gradually sharp-pointed ; about 

 0"24? by 028 mm. ; arranged in several layers parallel 

 with the dermal surface. (6) Oxea ; very lai-ge, stout, 

 fusiform, usually gently curved, gradually sharp-pointed at 

 each end; varying in size up to about 1'8 by 007 mm. 

 The outer ends of these spicules project far teyond the 

 dermal surface, while their inner ends extend through the 

 chamber layer into the gastral cortex. 



Locality. — Watson's Bay, Port Jackson (coll. T. Whitelegge). 



20. Grantia (.^) infreque^ni. Carter, sp. 



Ilypogmntia infrequens. Carter. Annals and Magazine 

 of Natural History, July ]886, p. :39. 



The chief peculiarities of this species appear to be the 

 presence of a very strong dermal cortex and tlie fact that 

 the tubar skeleton is made up entirely of the V)asal itxya of 

 subgastral sagittal triradiates. I have not seen the species 

 myself, and Mi'. Carter apparently had only a single small 

 specimen, collected by Mr. Wilson. I include it provisioiially 

 in the genus Grantia. 



Locality. — Near Port Phillip Heads (Cartel-). 



21. Grantia (}) IcBvigata, Hteckel, sp. 



Sycortii^ kevigata, Hseckel. Die Kalkschwamme, Vol. II, 

 p. 285. 



In his description Hseckel distinctly states that in the 

 case of the tabar trii-adiates the basal ray is always directed 

 centrifugally outwards, while in the dermal trii-adiates it 

 lies parallel to the long axis of the sponge and points to the 

 aboral pole. No mention is made in the text of any 

 subdermal sagittal triradiates with inwardly directed basal 

 ray, but in the figure (Plate 49, Fig. 3) such appear to be 

 present. Hence if the figure be correct we should have to 

 place the species in the genus Grayitessa, but the evidence is 

 hardly strong enough to justify us in so doing at present. 



Locality. — Gulf of St. Vincent (Hseckel). 



