240 ARTHUR DENDY. 



phoriscus is occupied by a distinct genus of sponges^ which 

 ought not to be confounded with the one under consideration; 

 the name Leuconia is altogether out of the question, for 

 reasons already discussed; and the name Grantessa has pri- 

 ority over both Heteropia^ and Hypograntia. 



The genus Grantessa of von Lendenfeld (11), however, is 

 by no means synonymous with the genus here maintained. 

 The original type of the genus is Grantessa sacca, and its 

 author bases the generic distinction upon the presence of tufts 

 of oxeote spicules projecting more or less at right angles from 

 the dermal surface, and arranged without regard to the radial 

 chambers (10). In his description of G. sacca, however, he 

 mentions the presence of "dermal" sagittal triradiates with 

 an inwardly directed basal ray, but he evidently does not con- 

 sider this character as of generic, much less of family im- 

 portance. Attributing, as I do, great importance to the 

 presence of subdermal sagittal triradiates, and very little im- 

 portance to the arrangement of the dermal oxea in tufts (which 

 bear no relation to the radial chambers), I have felt it neces- 

 sary, while adopting the name Grantessa, to give an entirely 

 new significance thereto. 



Genus 14. — Heteropia (Carter [15], emend.). 



Diagnosis. — The distal ends of the elongated radial 

 chambers are covered over by a well-developed dermal cortex, 

 consisting principally of large oxea arranged parallel to the 

 long axis of the sponge. 



Remarks. — The name Heteropia was first applied by 

 Carter to his Aphroceras ramosa (16), and I therefore 

 consider that species as the type of the genus. The name was 

 also applied by the same author and at about the same time 

 (12) to a number of Victorian sponges, but I have already 

 pointed out that for the latter the name Grantessa must 

 take priority. Indeed, it is perhaps doubtful whether Hete- 

 ropia ramosa deserves to be generically separated from 

 Grantessa, to which genus it bears exactly the same relation 

 ' Heteropia is also in use for another genus. 



