1895. MICROSCOPICAL JOURNAL 3 



eggs may be found in the tanks at all seasons, even in 

 the winter. 



Of Nais worms there appear to be quite a number of 

 species. They may be seen projecting from their tubes 

 in the mud and swaying from side to side with a grace- 

 ful undulating motion. They are easily alarmed and 

 instantly vanish within their tubes when one attempts to 

 catch them. They vary in length from i inch to 2 inch- 

 es. Some are blood-red, others light brown or colorless. 

 Certain kinds creep along the stems of water plants, or 

 in the slime swallowing great mouthfulsof confervacese, 

 and the animalcules entangled therein. One species has 

 a probosis very much like an elephant's. Another is 

 transparent, but covered with round red spots, present- 

 ing an appearance strikingly like that of calico so orna- 

 mented. 



Planarian worms are apt to be found in every gather- 

 ing. Many species are round, some broad and flat, others 

 longer. The black spots commonly observed in the head 

 and referred to as eye-spots, seem to the writer to be 

 nervous ganglia. These worms have cilia, like inf usorians, 

 but their very rapid motion causes them to be invisible. 



A very peculiar worm of this family was found last 

 August, and appears to be a Catenula. A drawing of the 

 same is submitted. (Fig. 1.) The first individual seen 

 had seven segments, each a complete worm just ready 

 to separate. It moved through the water with an easy 

 gliding motion bending from side to side in its course. 

 On the hinder segment fine straight cilia were very plain; 

 but only indications of them were present elsewhere. 

 Being kept for observation, this individual the next day 

 had separated into two parts, one of three and the other 

 of four segments. Although watched for nearly a week 

 that of four segments swam around freely, but did not 

 again divide. It was then lost. 



Once, an infusorian, an Urostyla, iu darting hither and 



