EXPLANATION OF PLATES. 



Index to lettering. 



(ic acetabulum. 



cir cirrus. 



col collar. 



cp clinging plug. 



cs cirrus sac. 



csp collar spines. 



E ^,gg. 



ep excretory pore. 



ev excretory vessels. 



gen. s genital sinus. 



go genital opening. 



int intestine. 



Lc Laurer's canal. 



od ovidnct. 



Oe esophagus. 



ogs opening of genital sinus. 



Oo ootype. 



OS oral sucker. 



Cv ovary. 



P pharynx. 



Pp prepharynx. 



sg shell gland. 



Ti anterior testis. 



Ti posterior testis. 



tud transverse vitelline duct 



lit uterus. 



vag vagina. 



vag. sp vaginal sphincter. 



vd vas deferens. 



ve vas efferens. 



vf ventral fold. 



vit vitellaria. 



T'. r vitelline reservoir. 



v. s vesicula seminalis. 



Plate 1. 



Fig. 1. — Echinochasmus perfoUatus shieldsi, ventral view ; A, same, with collar 

 and spines enlarged ; B, same, cross section through pharynx. 



PllATE 2. 



p-rn. 2. — A, B, C, Prohemistomum industrium, showing general external appear- 

 ance. 

 3. — Proheniistontiim indnstrium, ventral view. 



Plate 3. 



Fig. 4. — Prohemistomum industrium,; A, reconstruction of male genital organs ; 

 B, reconstruction of female genital organs; C, cross section through 

 anterior end of posterior testis. 



Plate 4. 



Fig. 5. — Prohemistomum spinulosum, ventral view. Adapted from Odhner, 1913. 

 G. — Prohemistomum appendicnlatum, ventral view. Adapted from Ciurea, 

 1916. 



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