SOME AQUATIC WORMS, ETC. 189 



middle to form two worms. In these cases the pro- 

 boscis of the new worm becomes conspicuous at the cen- 

 tre of the long body. The mouth is near the 

 base of the snout -like prolongation, and this 

 narrow extension of the upper lip varies much 

 in length in the various species. The one Fi<r 134 _ 

 represented in Fig. 134 belongs to a common snout of a 

 form in the writer's locality, and is unusually 

 long. The posterior extremity is commonly nearly as 

 shown in Fig. 135, and surrounded by many 

 short stiff hairs, it being the tail-end of the 

 Pristina whose proboscis is shown in Fig. 

 Fig 135.-POS- -^ Occasionally this part lias three long 



terior extrem- 

 ity of a Pns- trailing appendages, as in Fig. 136. The 



blood is usually red. The bristles are long 

 and fine, and are often accompanied by one 

 or more short, nearly straight, rudimentary / flf 



spines. The podal spines are in two rows M 



on the ventral surface, each cluster frequent- | j| 



ly containing as many as eight. The pos- Fig. m-poste- 



. * i , i f L 'TJ.J r ' or extremity 



tenor part-of the intestine is often ciliated. of a p r i st i na . 



The worms are found among aquatic 

 plants, seeming especially fond of Sphagnum and Lemna 

 as a home. 



2. ENCHYTR^EUS. 



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 decaying 

 bark, often in considerable numbers. The podal spines 



