98 NORTH AMERICAN 



PLATE VIII. 



CEPHALOBUS, Bastian, 1865. 

 Fig. 22. Cephalobus sub-elongatus, n. sp. Lateral view of a female. 



a, lips ; b, pharynx ; c, anterior portion of oesophagus ; d, posterior ex- 

 tremity of anterior portion of oesophagus; e, nerve-ring; /, cardiac bulb; g, 

 beginning of intestine ; h, one of the cells of the intestine ; i, lumen of the 

 intestine ; /, excretory pore ; k, cardiac valve ; I, renette cell ; m, flexure in 

 single ovary; n, cuticle; o, ovary; p, spermatozoon in uterus; q, vulva; r, 

 nucleus in ovum; s, body cavity; t, anus; u, ripe ovum; v, unripe ovum; w, 

 oocyte; x, blind end of ovary; y, rectum; z, terminus. 



5k- 



BASTIANA, de Man, 1876. %' , 



Fig. 23. Bastiana exilis, n. sp. Lateral view of a male specimen. 



a, one of the six cephalic papillae; b, one of the posterior set of four 

 submedian cephalic setae ; c, one of the anterior set of six cephalic setae ; d, 

 oesophagus ; e, cervical seta ; /, amphid ; g, one of the cells of the intestine ; 

 h, one of the numerous male supplementary organs ; i, blind end of the two 

 testes; j, nerve-ring; k, posterior extremity of oesophagus, (pseudo-bulb); 

 /, left spiculum; m, cuticle; n, spermatozoon; o, anal muscle; p, treminus; q, 

 vas def erens ; r, intestine. 



MESOMERMIS, Dady. 



Figure 24. Mesomermis Virginia n. sp. Neck and head of the same 

 species shown in figure 18, showing how the deteriorated oesophagus changes 

 rather gradually into the intestine. 



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

 of the posterior row of cephalic papillae; d, pharynx; e, exterior of amphid; 

 /, interior of amphid; g, oesophagus; h, innervated papilla; i, glandular 

 cephalic organs; j, nervering; k, lumen of oesophagus; /, intestine. 



APHANOLAIMUS, de Man, 1880. 



Fig. 25. Aphanolaimus spiriferus, n. sp. I, lateral view, anterior ex- 

 tremity of a female; II, lateral view, posterior extremity of a female; III, 

 lateral view of head, more highly magnified; IV, one of the male supple- 

 mentary organs ; V, lateral view of posterior extremity of male. 



a, mouth opening ; b, amphid ; c, lumen of oesophagus ; d, pigmented eye- 

 spot (?); e, intestine; /, nerve-cell; g, rectum; h, nerve-ring; i, anus; k, 

 oesophagus ; /, caudal gland ; m, duct of one of the caudal glands ; n, gland- 

 ular body at base of neck; o, spinneret; p, ejaculatory duct; q, intestine; r, 

 anterior end of cloaca ; s, right spiculum ; t, backward pointing accessory 

 piece; u, nerve-cells (?) ; v, one of the numerous male supplementary organs. 



