G6 



ANIMAL PARASITES AND MESSMATES. 



sponge for the bottom ; Professor Loven has shown the 

 true pose of the Hyalonema, and this he has effected 

 by means of a small specimen from the Northern 

 Sea. 



Semper fomid a new (Ega, to which he gave the 

 specific name of Hirsuta, in an enlarged canal of the 

 new Hyalonema of the Philippine Islands, which he 

 dedicated to Mons. Schultze. 



The Adriatic also produces a species of the same 

 genus {Polythoa) which inhabits, like that of the Chinese 

 Sea, a sponge to which the name of Ax'inclla has been 

 given. These Polythose are only found on the Axinellse, 

 says Osc. Schmidt, who has especially studied the sponges 

 of this sea and of the Mediterranean. Professor Gill 

 mentioned at the last meeting of the scientific congress 

 at Portland (1873), a new Hyalonema found on the coast 

 of North America by the fishery commission of the 

 United States. A memoir on these sponges, interesting 

 in a systematic point of view, is due to the pens of 

 Herklots and of Marshall. 



We think that we ought to place among fixed mess- 

 mates a very problematical 

 organism which lives on Ser- 

 tularise, especially on the 

 Sertularia ahiet'ma, and which 

 Strethill Wright has desig- 

 nated by the name of Core- 

 thria sertularia, Claparede 

 has given to this singular 

 animal the more expressive 

 -,. , ^ - . , , .... name of Ophhdendrum abie- 



Fig. 1. — Opnioacnarum abietmum ■^ 



on Sertularia abietiua. tinUJTl* 



