1887.] NATURAL SCIENCES OF PHILADELPHIA. 17'.) 



(7) Ephydatia bohemica, F. Pctr. 



Syii. 1886 Ephydatia hohemica F. Petr. 



Colony very small, green, and is found living (parasitic or sym- 

 biotic) in the colonies of Easpongilla lacustris. Skeleton spicules 

 .straight or slightly curved ; at times covered with fine spines. 

 Parenchyma spicules numerous, straight or somewhat bent, covered 

 with spinous processes as in Carterius stepanowii Gemmulse with 

 large apertures (mikrodioden) whose pole is expanded into a broad, 

 irregular funnel. In the air-chamber-layer are embedded amphidiscs 

 of equal lengths; some of which, however, project above the surface 

 of the gemmuhe. Their shafts are slender and longer than the 

 <liameter of the nearly regular, star-shaped, terminal discs. The 

 rays of those discs are finely notched. Rarely does the mikrodiode 

 funnel run into a lengthened tube. 



Ephydatia bohemiea is, as yet, found only in one place in Europe, 

 viz: in Kvasetic near Deutschbrod in Bohemia. 



This species is very characteristic, as it has a certain relationshi[) 

 to, if it is not a transitional form of the following genus Carterius ; 

 in the fact that the amphidiscs are indistinctly of two lengths ; 

 and the tendency shown though rare, for the mikrodiode to lengthen 

 into a polar tube, which is so characteristic in Carterius. 



(IV) Gen. CARTERIUS, Potts. 

 Syn. Dos'dia, Dybowski, Gray. 



Skeleton spicules smooth ; those of the parenchyma spinous. 

 Gemmuhe with a deep, straight air tube which terminates in an ir- 

 regular, lobulated disc. 



In the air-chamber-layer are embedded amphidiscs of two lengths; 

 one set being as long as the thickness of the air-chamber-layers ; 

 the others, just as numerous (?), as the former, project beyond the 

 .surface of the gemmulje. 

 (8) Carterius stepanowii, Pctr, (Dybowski.) 



Syn. 



1863 Spougilla haileyl, (?)Bowerbank. 

 1881 Meyenia " (?) Carter. 

 1884 Dodlia stepanowii, Dybowski. 

 1881 Carterius " Petr. 



Colony slender, branching, fine to fibrillar, (?) surrounding the 

 stems of water plants. It is of a bluish-green color ; dimensions in- 

 significant. Skeleton spicules smooth, straight or curved, sharp- 

 pointed. Parenchyma spicules numerous, bent or straight and 



