172 PROCEEDINGS OF THE ACADEMY OF [1887. 



Diagnosis of the European SpoNGiLMDiE. 

 Translated from the Bohemian of Prof Fr. Vejdovsky, in Prague. 

 Fam. SPONGILLID^ 



iA}—Sud-f<7m. SFONGILLINAl, Carter. 



"Gremmulse, sometimes single and sometimes collected into groups; 

 generally surrounded by an air-chamber-layer, in which the gem- 

 nudse spicules are embedded. 



(I) Gen. SPONGILLA, Auct. 



With long, smooth skeleton spicules and short, either straight or 

 curved, smooth or rough parenchyma spicules. Gemmulaj either 

 entirely smooth or with an external air-chamber-layer, in which the 

 gemmulse spicules are either tangential or radial, or entirely irreg- 

 ularly embedded. 



(a) Sub-gen. EUSPONGILLA, Vejdovskv. 



Gemmulje always single. (Besides the European species, most 

 of the exotic species to which Carter gives the generic name of Spon- 

 gilla belong here.) 

 (I) Euspongilla lacustris, Auct. 



Syn. — Spongilla lacustri.s, (?) Linn. 



1788 " canalium, (?) Gmelin. 



1816 " ramosa, (f) Lamarck. 



1842 " lacustris, (?) Johnston. 



1853 " " Lieberkiihn. 



1866 " " Bowerbank. 



1870 " lieherkuhnii, Noll. 



1877 " lacustris, Vejdovsky. 



1877 " jordanensis, " 



1881 " lacustris, Carter. 



1882 " " Dybowski. 



1888 " (Euspongilla) lacustris, Vejdovsky. 



1883 " " " jordanensis, " 



1883 " lacustris, Retzer. 



Var. spon. lacustris ramosa, Retzer. 

 " " lieherkuhnii " 



1884 Euspongilla lacustris, Wierzejski. 



Diagnosis: — Colony (Stoecke) branched or cushion-like, grass- 

 green, yellowish or brownish. Oscula) and pores indistinct but 

 everywhere numerous. Skeleton spicules, straight or slightly curved, 

 sharp pointed, smooth and enclosed in bundles in a horny sheath. 

 The parenchyma spicules are present in variable numbers, generally 

 moderately curved and set thick with tine spines : at times, however, 



