62 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



renierid, however, but contains spicules in confusion ; Reniera {Hali- 

 clona) is for sponges with oxeas in isodictyal reticulation. As a 

 matter of fact there is a British sponge that answers rather closely 

 to Schmidt's description of amorpha. Bowerbank (1874, p. 243) 

 called it Desmacidon columella^ and subsequent authors, led by 

 Hanitsch (1894, p. 180) have called it Stylofella columella. Stylo- 

 tella Lendenfeld (1888, p. 185), type species as fixed by Kallmann 

 (1914, p. 348), S. digitata (which is Ridley's Hymeniacidon agmin- 

 ata)., is suberitid. It must be said that the specimen of colmnella 

 that I collected at Plymouth, in September, 1928, agreed even more 

 closely with Schmidt's description of amorpha than did Bowerbank's 

 original description. The species columella and amorpha may or may 

 not be specifically identical, but they are clearly congeneric and not 

 properly Reniera, Desnnacidon, or Stylotella. Prianos may quite 

 fitly be employed for them. 



Other genera with strongyles as principal spicules include the fol- 

 lowing without microscleres : 



Joyeuxia Topsent (1892, p. 93), type species /. viridis. In this 

 the spicules are almost all dermal, the endosome being nearly devoid 

 of skeleton. Some of the spicules are oxeas. See the genus Phloe- 

 dictyon for comparisons. 



Batzella Topsent (1893, p. xxxiv), type species B. inops, like the 

 above has very few spicules at all. It had mycalid embryos. Some 

 of its spicules were styles. See Infiatella for comparisons. 



Liosina Thiele (1899, p. 16), type species L. paradoxa. This may 

 be a synonym of Prianos. 



Petrosia Vosmaer (1885, p. 338), type species P. dura., is stony 

 hard. It is interesting to compare consistencies here, as both 

 Prianos am^orphus and P. columiellus are very soft, while P. proMe- 

 m^aticus is intermediate, just moderately stiff and firm. 



Protoschniidtia Czerniavsky (1879, p. 380), type species P. s/mp?e«. 

 This genus is inadequately known; is referred to as halichondroid 

 with hispid dermis, "surface set over with tubes," spicules strongyles. 



The following genera with microscleres have strongyles as prin- 

 cipal spicules. In view of the well-known fact that microscleres 

 may be lacking for unknown reasons, all species without them may 

 be but derivatives by reduction, but often it is impossible to ascer- 

 tain the source. Prianos may therefore really be congeneric with 

 some one of the following : 



Barhozia Dendy (1922, p. 131), type species B. primitiva. The 

 microscleres are anisochelas and discorhabds; the sponge is 

 papillate. 



Phlyctaenopora Topsent (1904, p. 198), type species P. hitorquis. 

 The microscleres are anisochelas and sigmas; this also is papillate. 



