PLATE 7. 



Fig. 1. Nierstrassia fragile. Cross section at level of B of fig. 3, pi. 6. 



Fig. 2. DorvTnenia peroneopsis, entire animal. X 3. 



Fig. 3. Section through brain at level of line B of fig. 5, pi. 7. 



Fig. 4. Section through anterior end of body corresponding to line E of fig. 5, pi. 7. Salivary 

 glands in natural position. 



Fig. 5. Reconstruction of anterior end of body. The main portion of the ventral salivary gland 

 has been shifted ventrally to show radular mechanism. 



Fig. 6. Reconstruction of radular apparatus. 



Fig. 7. Reconstruction of posterior end of body. 



