216 NEMATHELMINTRES 



Cx Mouth not surroundf d by 3 promiuont lips. 

 di Body very long and filiform ; 4 pairs of papillae around the anus of 



male 4. Filariidae 



di Anterior part of body with a very long and characteristic row of cells. 



5. Trichinellidae 



dg Male with a large bell-shaped bursa 6. Stkongilidae 



<?2 Mouth surrounded by 3 prominent lips 7. Ascaridae 



Family 1. ENOPLIDAE. 



Minute, free-living worms, found principally in the sea, but also in 

 fresh water or in the earth; mouth often surrounded by hairs and 

 bristles ; oesophagus without bulb ; eyes often present ; male with spicules : 

 numerous species. 



1. Enoplus Dujardin. Body elongate, tapering behind; cuticula 

 smooth; mouth with 6 papillae, behind which is a circlet of 10 to 12 

 bristles: numerous species in both salt and fresh water. 



E. brevis Bastian. Lives among algae and hydroids in shallow 

 water; often greenish in color; length 5 mm. 



2. DoRYLAiMUS Dujardin. Large worms; cuticula smooth, not 

 ringed; extreme front end set off by a constriction; mouth with papillae 

 and a large bristle: numerous species, which live at the roots of plants 

 in moist earth and water. 



D. maximus Blltschli. Length 7 mm.: in garden earth. 



Family 2. ANGUILLTJLIDAE.* 



Minute worms which lead a free life in water or earth or decaying 

 substances, or are parasitic in plants or (rarely) in animals; mouth with- 

 out papillae; oesophagus with 2 bulbs; male with 2 spicules and some- 

 times with a bursa: numerous genera and species. 



Key to the genera of Anguillulidae here described : 



Oi Free-living worms, in soil or decaying substances. 



\ Mouth with 2 or 3 teeth 2. Diplogaster 



62 Mouth without teeth. 



Ci In vinegar or paste 1. Anguillula 



Co In the earth or decaying substances 3. Riiabditis 



Qi Parasitic worms. 



61 Parasitic in plants ; a spine in the mouth. 



Ci In the roots of vegetables 4. IIeterodera 



C2 In wheat <). Tylenchus 



62 Parasitic in animals. 



Ci In the bumble bee 5. Spil^.RULARIA 



c-i In man 7. Strongyloides 



* See "Ilelminthological Contributions," No. 2, by J. Loidy, Proc. Acad. Nat. Sci., 

 Phila., Vol. o, p. 224. "Monograph of the Anguillulidae," by H. C. Bastian, Transact. 

 Linn. Soc, London, Vol. 2."5, 1866. "On the Family Anguillulidae," etc., by J. Leidy, 

 Proc. A. N. S., Pliila., Vol. 22, p. 68, 1870. 



