ON THE NEMATODES OE THE COMMON EARTHWOKM. 651 
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EXl>LANATION OF PLATE 37. 
Illustrating Mr. G. E. Johnson's memoir “On the Nematodes 
of the Common Earthworm.” 
acc. p. Accessory piece, amceb. Envelope of dead amoebocytes. buc. 
cav. Buccal cavity, burs. Bur.sa with bursal papillae, cy. Cyst. ex. 
can. Excretory canal, ex. po. Excretory pore. yen. riid. Genital rudi- 
ment. int. Intestine, nerv. col. Neiwe-collar. oes. b. (Esophageal 
