68 DROPS OF WATER. 



line of transparent dots down the middle; 

 C. Diante (Drop I. fig. 9) is quite crescent- 

 shaped, small and slender ; C. setaceum (Drop L 

 fig. 10) is perhaps the most beautiful it is 

 very slender in the centre, the ends tapering 

 into long beaks, and rather curved, which give 

 it an elegant form. These specimens will be 

 sufficient to make the reader or microscopist 

 familiar with the genus. 



Spirottfnia greatly resembles Closterium in 

 size and general form, but is easily distinguished 

 by the green matter forming a spiral line from 

 one extremity to the other ; there is no mark of 

 division in the centre, and the ends are round. 



Occasionally may be seen very minute bun- 

 dles of green objects, like little faggots ; these 



