96 THE AMERICAN MONTHLY [March 



the animals are kept, and after an hour, bringing them 

 into oil of lavender from which, after perfect clearing, 

 they are mounted in balsam. 



The three swimming rotifers readily succumb to the in- 

 fluence of cocaine, but the family Melicertadse hold out a 

 long time against it. A method for these is like that for 

 the bryozoans with the exceptions that only sufficient 

 water to cover the colony well need be used, the quan- 

 tity of cocaine must be relatively large, and when all 

 movements cease, killing may be done with twenty per 

 cent formalin, for chromic acid precipitates cocaine, when 

 present in any considerable quantity. An alter treat- 

 ment with chromic acid in one-half percent seems to give 

 better hardening than formalin alone. When a colony 

 of the Melicertadse are subjected for fifteen minutes to a 

 half-per cent cocaine solution and then transferred to 

 another watch glass with pond water, the individual roti- 

 fers come out of the tubes and attach themselves hydra- 

 like to the bottom of the glass in perfect condition for 

 study, saving the trouble of freeing the animals from the 

 tubes with needles. 



Radiolaria ; a new Geuus from Barbados. 



REV. FRED'K B. CARTER. 



MONTCJLAIE, N. J. 



Staurococcura, n. gen. 



Definition. — Coccodiscida with four chambered arms on 

 the margin of the circular or quadrangular disk, crossed 

 in two equatorial diameters, connected by a spongy pata- 

 gium. Medullary shell double. 



/Staurococcura quarternaria, n. sp. 



Phacoid shell quadrangular, twice as broad as the 

 outer and six times as broad as the inner medullary shell, 

 with seven pores on its radius. Arms club-shaped, two 



