PLATE XXXIII. 



ph..- 



I 



Fio. 3. Unsegmented egg. Egg with two blastomeres. 

 Egg with four blastomeies. E-'g with eight l>lastomeres, 

 only six showing. Egg with blastomeres, all showing. Egg 

 with sixteen hlastomeres. Egg with thirty-two blasto- 

 meres. Egg with sixty- four blastomeres. Egg with coiled- 

 up larva, ripe for hatching. A similar egg, artificially 

 ruptured, and the larva in the act of escaping. This shows 

 the contraction of the egg-shell when ruptured. 



u,t- 



.! \ s 



fir 



i. 



2. 



FIG. 1. Male Triclw- 

 strotigylus pergracilis, 

 showing m mouth, ali- 

 mentary canal, spicules, 

 and genital bursa. 

 Magnified. 



FIG. 2. Female T. per- 

 gracilis, showing an. 

 anus ; c gl. cephalic 

 glands ; m. mouth ; oe. 

 oesophagus ; of. ove- 

 jectur ; o. ovary ; j>h. 

 pharynx ; r. rectum ; 

 >(/. uterus with segment- 

 ing eggs ; v. vagina. 

 Magnified. 



FIG. 5. A female Triehosoma lonyicolle 

 Magnified about seven times. 



Fio. 4. Three specimens of female 

 Triehosoma longicoUe. Magnified 

 about twice. 



TJtICHOKTJtONGYLUS /'KlfdlfACILIN AND TKICJI080MA LONGICOLLE. 



1 1], ;if,.S'l7f p. 200.] 



