190 MICROSCOPY FOR BEGINNERS. 



are usually short, nearly straight, and not forked. The 

 blood is pale or colorless. There are two species, which 

 are not very difficult to distinguish from each other. 



In one (Enchytrceus vermiculdris) the body is yel- 

 lowish 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 next. 



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 

 jnouth is triangular. This species is most frequently 

 found in more or less social groups beneath the moist 

 bark of old stumps or the decaying parts of trees, and 

 usually near the ground. 



3. CH^ETOGASTEK. 



Body transparent, often showing evidences of trans- 

 verse fission. The podal Bpines are in two rows, the 

 clusters containing four to eight spines each, being 

 usually most numerous towards the posterior extremity. 

 The mouth is large, oblique, and surrounded by many 

 very short stiff hairs. It is often used, when the worm 

 is on the slide, as a sticker, clinging to the glass and 

 drawing the body towards it. The intestine, in the 

 species common in the writer's vicinity, is much and 



