BY E. F. KALLMANN. 519 



T.{1) pnmifio Schmidt(35). Florida. 



T.{1) vagabunda Schmidt(35). Florida. 



7\i')ifu7idibnli/ormisVosmaer{56);{Z0) Arctic Ocean. 



7'. rosea Fristedt(9); (30); (53). E. Greenland; Azores. 



T. vulgaris Topsent(38). Banyuls. 



2\ yrimaldli Topsent(44); (46); (53). Azores. 



T. humilis Thiele(41). Ternate. 



T.jania Verrill(55). Bermudas. 



T. alba Wilson(61). E. of Galapagos Is. 



?'. vestibularis Wilson(61). E. of Galapagos Is. 



T. truncata Hentschel(15). Arafura Sea. 



T. informis Stephens.* W. Coast of Ireland. 



Under the name Desinacella areni fibrosa, Hentschel(14; has 

 described, from Western Australia, a species which evidently 

 cannot be referred with propriety eitlier to 7'ylodesma or to 

 Biemna: for although the megascleres are styli and subtylostyli, 

 and the microscleres toxa (of two .sizes, the longer measuring 

 303 to 340//. in length and much resembling rhaphides), the main 

 skeleton consists of stout fibres formed chiefly of sand grains, 

 without visible spongin-cement. The constitution of the skeleton 

 and the rhaphide-like character of the longer toxa suggested to 

 me that the species might belong to Dendy's Stylotrichojyh<)ra{Q\ 

 established for a single species— *S'. rubra from Port Phillip, 

 and defined thus : " The main skeleton is a network of horny 

 fibre cored with foreign bodies. In addition to this, there are 

 smooth monactinal megascleres (styli) and hair-like microscleres 

 (rhaphides)." Examination of the type-specimens of S. rubra, 

 which were kindh' forwarded to me by the Curator of the Mel- 

 bourne National Museum, has shown that such really is the 

 case : for in this species also, small toxa are present, and the 

 long rhaphide-like megascleres are frequently curved more or less 

 in the manner of toxa. The chief points of difference between 

 the two species are their somewhat different external habit, and 

 the fact that in S. rubra the megascleres are styli only, the 

 fibres are provided with a well-defined spongin-sheath, and the 



* Stephens, J. — " Preliniinaiy Notice of some Iri.sh Sponges." Ann. 

 Mag. Nat. Hist. (8), xvii., 191(), p.234. 



