96 NORTH AMERICAN 



PLATE VII. 



MESOMERMIS. 

 Fig. 18. Mesomermis virginiana, n. sp. Lateral view of head and tail. 



a, mouth opening; b, one of the anterior rows of cephalic papillae; c, 

 one of the posterior row of cephalic papillae ; d, pharynx ; e, exterior of am- 

 phid; /, interior of amphid; g, oesophagus; h, innervated papilla; , gland- 

 ular cephalic organs; /, nerve-ring; k, lumen of oesophagus; /, intestine; m, 

 ejaculatory duct ; n, body cavity ; o, oblique copulatory muscles ; p, one of the 

 submedian supplementary organs; q, one of the median supplementary or- 

 gans; r, spicula; s, one of the median post-anal supplementary organs; t, 

 final submedian supplementary organs; u, submedian supplementary organ. 



ETHMOLAIMUS, de Man, 1880. 

 Fig. 19. Ethmolaimus americanus, n. sp. Lateral view of a female. 



a, lips ; b, minute dorsal and ventral pharyngeal teeth ; c, one of the 

 four cephalic setae; d, amphid; e, pharynx; /, nerve-ring; g, excretory pore; 

 h, nerve cells; \, cardiac bulb; j, beginning of the intestine; k, renette 

 cell (?); /, beginning of main portion of the intestine; m, one of two 

 pairs of unicellular organs of unknown significance; n, cuticle; o, one of the 

 cells of the intestine; p, subcuticle; q and r, body cavity; s, vulva; t, nuclei 

 of one of the muscle cells ; u, spinneret ; v, one of the caudal glands ; w, anus. 



MONHYSTERA, Bastian, 1865. 



Fig. 20. Monhystera sentiens, n. sp. I, side view of a female; II, side 

 view of head of the same; III, side view of posterior extremity of a male. 



a, pharynx ; b, submedian cephalic seta ; c, lateral cephalic seta ; d, sper- 

 matozoon ; e, amphid ; /, lining of oesophagus ; g, oesophagus ; h, subcephalic 

 setae; i, lumen of intestine; /, nerve cells; k, nerve-ring; /, striated lip re- 

 gion; m, left spiculum; n, glandular structure associated with amphid; o, 

 blind end of single ovary; pp, the three caudal glands; q, anal muscles; r, 

 spinneret: s, beginning of intestine; t, anus; u, one of the cells composing 

 the intestine; v, vulva; w, egg, the spermatozoa "d" being outside of the egg 

 '''"; x, egg in synapsis ; y, vaginal glands ; z, ovum. 



ONCHOLAIMELLUS, de Man, 1886. 



Fig. 21. Oncholaimellus heterurus, n. sp. I, side view of head ; II, ven- 

 tral view of head; III, side view of tail end of male; IV, ventral view of 

 anal region of male. 



a, excretory pore; b, submedian cephalic seta; c, pharynx; d, left flap 

 of bursa; e, oesophagus; /, left spiculum; g, accessory piece; h, amphid; , 

 male post-anal seta and papilla; j, lateral seta; k, spinneret; I, thin lips. 



