92 NORTH AMERICAN 



PLATE V. 

 ACHROMADORA. 



Fig. II. Achromadora minima, Cobb. I, lateral view of a female; II, 

 lateral view showing cuticular markings; III, lateral view of head. 



a, cephalic papilla; b, cephalic seta; c, one of the ribs of the pharynx; 

 d, dorsal pharyngeal tooth; e, sub-ventral (?) pharyngeal tooth; f, pharynx; 

 g, cuticular markings ; h, amphid ; i, nerve cell ; /, nerve-ring ; k, spinneret ; 

 /, excretory pore ; m, flexure of ovary ; n, one of the caudal glands ; o, blind 

 end of posterior ovary; p, anus; q, intestine; r, vulva; s, one of the gran- 

 ules of the intestine ; t, egg. 



DORYLAIMUS, Dujardin, 1845. 



Fig. 12. Dorylaimus fecundus, n. sp. Side view of head and tail of 

 female, and tail of male. 



a, spear or onchus; b, one of the six anterior cephalic papillae; c, one 

 of the six posterior cephalic papillae ; d, guiding ring of the spear ; e, oeso- 

 phagus ; /, intestine ; g, rectum ; h, anus ; i, one of the anal muscles ; ;', one of 

 the four lateral caudal, innervated papillae ; k, cuticle ; /, subcuticle ; m, mus- 

 cular layer; n, wall of the intestine; o, one of the numerous oblique ejacu- 

 latory muscles; p, one of the numerous ventral male papillae; q, ejaculatory 

 duct ; r, one of the two preanal papillae ; s, retractor muscle of one of the 

 spicula ; t, muscular layer ; u, right spiculum ; v, right accessory piece. 



IRONUS, Bastian, 1865. 



Fig. 13. Ironus americanus, n. sp. I, anterior extremity, lateral view, 

 oral organs everted: II, same, more highly magnified; III, anterior extremity 

 of a specimen about to moult, showing two sets of oral organs, the anterior 

 set in process of being replaced by the posterior; IV, posterior extremity of 

 a female, lateral view. 



a, one of the three chitinous oral teeth ; b, cephalic papilla ; c, cephalic 

 seta; d, amphid; e, pharynx; /, anterior group of minute pharyngeal teeth; 

 g, posterior group of pharyngeal teeth ; h, oesophagus ; i, lining of oesopha- 

 gus ; /, nerve-ring ; k, intestine ; /, anus ; m, base of the tail ; n, terminus. 



ONCHOLAIMUS, Dujardin, 1865. 



Fig. 14. Oncholaimus punctatus, n. sp. Lateral view of head and tail 

 of male specimen. 



a, terminal flaps of lips ; b, lip ; c, cephalic papilla ; d, one of the papilla- 

 like cephalic setae; e, right submedian onchus; /, left submedian onchus; g, 

 wall of pharynx; h, intestine; i, ejaculatory duct; /, one of the spicula; k, 

 dorsal onchus ; I, amphid ; m, duct of oesophageal gland leading into onchus ; 

 n, rectum ; o, beginning of the oesophagus ; p, anus ; q, lining of the oesopha- 

 gus; r, one of the caudal glands; s, one of the two male papillae; t, ducts of 

 the caudal glands; u, spinneret. 



