334 REVISION OF THE MONAXONID SPONGES, ii., 



they do ; for Lindgren {Joe. cif.) has described as Ciocalypfa 

 fcntida, a sponge which, while exhibiting the characteristic 

 skeletal features of Hymeniacidon ( ?) fwtida, also bears so 

 striking a resemblance in its stelliform surface-pattern to 

 Amorphinopsis excavans that he regarded it as sufficient to 

 establish the identity of these two species. The evidence is 

 sufficient, therefore, to render it advisable, for the present, to 

 assign //. faetidd and E. megarrhaphea to the genus Amorph- 

 hi apsis. 



The character of the main skeleton in these two presumable 

 species of Amorphinopsis suggests that the genus is related to 

 Halichondria and Topsentia; and one cannot regard it as other 

 than significant, therefore, that whilst oxea exhibiting the pecu- 

 liarity of form of those of R. megarrhaphea are of very rare 

 occurrence, closely similar spicules are found in Topsentia colossea 

 LundbeckOl), = 7^. pachastrelloides, Jide Topsent(47). In the 

 genus Halichondria also, somewhat similar spicules are possessed 

 by H. Jirma Bowerbank(2c). Accordingly, I would say that 

 these three genera, which at present are referred to three different 

 families, ought to be included in the same family, either the 

 Epipolasidce or the RaploscleridcE — and perhaps preferably in the 

 former, since it seems now generally to be conceded that Topsentia 

 and (some species at least of) Halichondria have originated from 

 Astromonaxonellida. If such a classification were adopted, the 

 genera Pyloderma{2i)^ Eumastia, Trachyopsis{i5) and MigasiZl)* 

 might also be admitted in the Epipolasidce; and it would then be 

 advisable to divide this family into three subfamilies — Coppa- 

 tiinae, Streptasterinse, and Halichondriinse. 



Reniera pand^a. 

 The specimen labelled as the type of this species — a descrip- 

 tion of which has already been furnished by Whitelegge(56) — 

 agrees excellently with the original description so far as skele- 

 tal characters are concerned, but is wholly incompatible there- 

 with in other respects ; its spiculation, in consequence of which 

 Whitelegge referred it to the genus Ehaphisiuy is similar to 

 * The name Migas is preoccupied for a genus of spiders. 



