EXPI.ANATION OF PLATE XIV. 



Temnocephala semperi. 



Fig. I.* — A specimen full^^ expanded, from above, much magni- 

 fied. 

 2} — A specimen attached by three tentacles and the sucker, 

 in the act of progression, much magnified. 



,, 3. — A preserved full-grown specimen, much contracted. 



showing the position of the elongated penis and 



principal organs, X 30. 

 ,, 4. — Penis of a similar specimen, X 210. 

 ,, 5. — Penis of a normal full-grown specimen, X 210. 

 ,, 6. — Distal portion of penis of the same specimen, X ro8o. 

 ,, 7. — Penis of a very young specimen, X 210. 



1 I am indebted to Mr. Kemp for these two figures. 



