EXPLANATION OF PLATE Xll. 



Fig. 1. — Clinoslomum piscidium. Entire worm showiii,!; the anatomy. 



,, 2. — Cercaria from the lateral muscles of Saccohranchus Jossilis. 



„ 3. — A cyst containing a Cercaria from the wall of the intestine 

 of OiiJiiocephalus maruUus. 



„ 3(a). — Another specimen of the same while still enclosed in the 



wall of the intestine. 

 ,, 4. — Cercaria from the lateral muscles of OpJiiocephalus striatus. 

 ,, 5. — Cercaria from the lateral muscles of OpJiiocephalus striatus. 

 ,, 6. — Cercaria from the lateral muscles of Trichogaster fasciatus. 



Explanation of Lettering. 



C. S. Cirrus Sac. Cy. Cyst. E. C. Encysted cercaria. E. 0. Excretory oiiening. 

 E. V. Excretory vesicle. G. A. Genital atrium. I. W. Intestinal wall. Int. Intestine. 

 N. C. Nerve collar. G. P. Genital pore. Ov. Ovary. 0. d. Oviduct. S(i) Anterior 

 sucker. S(ii) Posterior sucker or Acetabulum. T. Testis. Ut. Uterus. V. Vitelline 

 siland. V. d. vas deferens. 



