172 proceedings of the academy of [1887. 



Diagnosis of the European Spongillid^. 

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

 Fam. SPONGILLID^ 



(A)Sub-Fam. SPONGILLINM, Carter. 



"Gemmula;, sometimes jingle and sometimes collected into groups; 

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

 nmlie spicules are embedded. 



(I) Gen. SPONGILLA, Auct. 



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

 curved, smooth or rough parenchyma spicules. Gemmulae 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. ETJSPONGILLA, Vejdovsky. 

 Gemmulse always single. (Besides the European species, most 

 of the exotic species to which Carter gives the generic name of /Sfport- 

 (fdla belong here.) 



(I) Euspongilla lacustris, Auct. 



Syn. Spongilla lacustris, (J) Linn. 



1788 " canalimn, (f) Gmelin. 



1816 " ramosa, (.^) Lamarck. 



1842 " lacustris, (f) Johnston. 



1853 " " Lieberkiihn. 



]866 " " Bowerbank. 



1870 " lieherkuhnii, Noll. 



1877 " lacustris, Vejdovsky. 



1877 " jordanensis, " 



1881 " lacustris, Carter. 



1882 " " Dybowski. 



1883 " (Euspongilla) lacustris, Vejdovsky, 

 1883 " " " jordanensis, 



1883 " lacustris, Retzer. 



Var. spon. lacustris ramosa, Ketzer. 

 " " lleberkuhnil " 



1 884 Euspongilla lacustris, Wierzejski. 



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

 green, yellowish or brownish. Osculje and pores indistinct but 

 everywhere numerous. Skeleton spicules, straight or slightly curved, 

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

 Tlie parenchyma spicules are present in variable numbers, generally 

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



