ON THE ANGUILLULID^. 



179 



FREE NEMATOIDS. 



EXPLANATION OF PLATES. 



The same letters refer to similar parts in all the figures. 



Supplementary male organ. 

 k. Abdominal gland. 



Excretory orifice of same. 

 I. Floating gland-cells. 

 m. (Esophageal ring. 



Ocellus. 



Lateral canals. 



Integument. 

 , Cervical markings of same. 



Cephalic papillae. 



Caudal sucker. 



Sucker-tubes. 



Genital papillae or suckers. 



Caudal ala of male. 



Rays supporting same. 



Ovum. 



Sperm-cell. 



Most of the figures are representations of the object drawn to a scale of 150 : 1, i. e. are representations 

 magnified 150 diameters — the exceptions being figs. 126-128 and figs. 151-177} all of which are only 

 magnified 100 diameters. 



Unless stated to the contrary, the drawings represent the anterior and posterior extremities from a 

 lateral aspect — the animal lying on its side. 



Where transverse integumental striae exist, they are only represented on the anterior extremity. 



