ull. U. S. F. C. 1899. (To face page 492.) 



Plate VI. 



IG. Aficaris iiiffuics s*>. nov.. from Hiirhi/rrvtnm mna'his. \"i-iitnil 



view ol' lifiid. X 220. 

 17. Upper lip. .- 2'20. 

 IN. I\)st(.rior end, lateml view, x 65. 

 19. Po>ti_Ti<ir extremity, x 220. 



;X1. Transverse section'thrnnsh anterior end. < 100. 

 -'>1. liniiuUiire nematode on<';i]>suIcd on intestine cf Moln luola. 



Hrad. ■. 700. 

 52. I'ostL-rior end, hitL-nil vii-\v. ■ 100. 



o:l. Immature nematode {Asrtiris^ from T'rnjihi/n's rhuss. Lnlcral 



view of liead. :•; 100. 

 iA. Lateral view ol" posterior end. x HiO. 

 55. Ascnri.t Itabcna Linton, young, from Opsanus tail. Anterior end 



showing- the enihryonie cutich' in the aet of sloughing ofT. 



Sketched from life." Note that thf euticUM>f the pharynx r' is 



also separating. >; :iO0. 

 hC. rt-7, Ova show ing diflerenl stages of develoi)ment, life. Form.s 



liki- ( and/ noticed on ditlerent occasions. The enihryo / was 



in an ovum wliich had been kept 2 days in sea water. 



