316 



to the numerous ova in .the coils of the uterus located at the extreme 

 posterior end of the body. Specimens measure from 0,525 mm to 9,3 mm 

 according to degree of contraction, they are nearly cylindrical in cross 

 section, and somewhat abruptly and a little obliquely truncate anteri- 

 orly, and obtusely tapering behind. 

 The oral sucker is relatively large. 

 There are two ventral suckers 1 , 

 one is directly behind the other 

 and a little dorsal to it, both are in 

 the middle line. These suckers are 

 contained within a sheath formed 

 as a depression of the ventral sur- 

 face , and having a lip furnished 

 with a circular sphincter muscle ca- 



Fis. 2. 



Fig. 1. Ventral view of Cryptogonimus based on camera lucida drawings from whole 

 object, oc eye. ph, pharynx; ex, excretory bladder; int, intestine;. as', anterior ven- 

 tral sucker ; gp, genital opening ; vs", posterior ventral sucker ; vsm, seminal vesicle; 



ov, ovary; vt, vitellaria; le, Laurer's canal; ut, uterus; sp, testis. 



Fig. 2. View of a sagittal section of Cryptogonimus , camera lucida, indexing as in 



figure 1 ; sp, sphincter muscle of sheath ; sh, cavity of sheath. 



1 The only other distomid known having two ventral suckers is Podocotyle 

 fractum Rud. as recently pointed out in this journal p. 487. vol. 23. 1900 by Luhe. 



