PLATE X. 



Class-NEMATHELMINTHES. 



NEMATODA. 

 Trichina spiralis. 



FIG. 1. TRICHINA : MATUEE FEMALE, x 3 f . 



TO. mouth : i., i. intestine : g. genital opening : o. ovary. 



FIG. 2. TRICHINA : MATURE MALE, x 3 f . 

 TO. mouth : a. anus : t. testis. 



FIG. 3. YOUNG TRICHINAE THAT HAVE MIGRATED INTO A MUSCLE, x 3 |. 



FIG. 4. THE SAME : DEVELOPED AND ENCYSTED, x 3 f . 



FIG. 5. TRICHINA : FREED FROM THE MUSCULAR FIBRES, x 30. 



