1887.] NATURAL SCIENCES OF PHILADELPHIA. 17!) 



(7) Ephydatia bohemica, F. Pctr. 



Syn. — ; 1886 Ephydatia bohemica F. Petr. 

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

 biotic) in the colonies of Euspongilla lacmtrh. Skeleton spicules 

 5<traight or slightly curved; at times covered with fine spines. 

 Parenchyma spicules numerous, sti-aight or somewhat bent, covered 

 with spinous processes as in (JarteriuH stepanowii. Gemmulse with 

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

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

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

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

 diameter of the nearly regular, star-sliaped, terminal discs. The 

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

 funnel run into a lengthened tube. 



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

 viz: in Kvasetic near Deutschbrod in Bohemia. 



This spe(nes is very characteristic, as it has a certain relationship 

 to, if it is not a transitional i'orm of the following genus C'arteriu.^ ; 

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

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

 into a pohir tube, which is so characteristic in Ca.rterius. 

 (IV) Gen. CARTEEIUS, Potts. 

 Syn. — Dosilia, Dybowski, Gray. 

 Skeleton spicules smooth ; those of the parenchyma spinous. 

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

 regular, lobulated disc. 



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

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

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

 surface of the gemmulse. 

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



Syn.— 



1868 Spon.giUa baileyi, (?)Bowerbank. 

 1881 Meyenia " (?) Carter. 

 1884 Dodrucstepanowii, 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 



