BULLETIN 39, UNITED STATES NATIONAL MUSEUM. [42] 



in equal parts, then washing them in fresh water and i)utting them 

 into alcohol. 



If it is desired to preserve moderately large Selachians for the future 

 preparation of the skeleton as well as the skin, it suffices to open the 

 belly, remove the intestines, and immerse the animal in a 10 per ceut 

 solution of common salt. 



The Teleosts are treated like the Selachians, but the alcohol pene- 

 trates the tissues with still greater difficulty, and it is necessary, par- 

 ticularly with the larger forms, to make repeated injections of the liquid. 

 The Teleosts with silvery skin (Trachypterus) are put iuto saturated 

 sublimate for a few minutes before they are placed in alcohol. The 

 transparent larval forms may be put directly into weak alcohol, or may 

 be fixed first with saturated sublimate. 



The transparent fertilized eggs can be preserved for purposes of dem- 

 onstration by allowing them to remain for some minutes in the mixture 

 of alcohol and hydrochloric acid and then transferring them to pure 

 alcohol. 



O 



