SOME AQUATIC WORMS, ETC. 203 



ventral surface, each cluster frequently containing as 

 . many as eight. 



The posterior part of the intestine is ciliated. The 

 worms are found among aquatic plants, seeming es- 

 pecially fond of Sphagnum and of Lemna as a home. 

 They are not rare. 



2. EnCHYTR/«US. 



The body is white or yellowish white, thread-like, 

 and from about one-half to nearly one inch long. 

 The worms are found under damp logs or beneath de- 

 caying bark, often in considerable numbers. The 

 podal spines are usually short, nearly straight, and 

 not forked. The blood is pale or colorless. There 

 are two species, which are not difficult to distinguish 

 from each other. 



In one (Enchytrmus vermiculdi-is) the body is yellow- 

 ish white, and varies in length from five-twelfths to 

 eight-twelfths of an inch. The podal spines are in 

 clusters of from three to five spines each. This 

 species is usually found under damp and decaying 

 logs, and is less- common than the following. 



In the second (E. socidlis) the body is opalescent- 

 white and translucent, varying from five-twelfths to 

 ten- twelfths of an inch in length. The podal spines 

 are from five to seven in each cluster, the anterior 

 fascicles generally containing seven, the posterior five. 

 The mouth is triangular. This species is most fre- 

 quently found in more or less social groups beneath 

 the moist bark of old stumps or in the decaying parts 

 of trees, and usually near the ground. 



3. Ch^togAster. 

 Body transparent, -often showing evidences of trans- 



