ON THE ANGUILLULIDE. 
FREE NEMATOIDS. 
EXPLANATION OF PLATES. 
The same letters refer to similar parts in all the figures. 
a. Mouth. 
b. Pharynx. 
#. Pharyngeal teeth. 
V. Pharyngeal processes. 
c. Œsophagus. 
c. Median swelling of same. 
c". Terminal swelling of same. 
c", Valvular apparatus of latter. 
d. Intestine. 
d'. Hepatic cells. 
e. Anus. 
€. Anal glands. 
f. Vulva. 
J'. Vaginal glands. 
g. Male spicules. 
g Accessory pieces. 
h. Seminal tube. 
magnified 100 diameters. 
99338 
are 
v. 
Most of the figures are representations of the object drawn to a scale of 150: 1, 
magnified 150 diameters—the exceptions being figs. 126-128 and figs. 151-177; 
23 x 
ss 
ind 
Supplementary male organ. 
Abdominal gland. 
Excretory orifice of same. 
Floating gland-cells. 
CEsophageal ring. 
Ocellus. 
Lateral canals. 
Integument. 
Cervical markings of same. 
Cephalic papille. 
Caudal sucker. 
Sucker-tubes. 
Genital papillæ or suckers. 
Caudal ala of male. 
Rays supporting same. 
vum. 
Sperm-cell. 
ed on the anterior extremity. 
179 
i. e. are representations 
all of which are only 
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 striæ exist, they are only represent 
