308 



DK. T. S. COBBOLD ON SCLEEOSTOMA STNGAMUS. 



torsion, however, is more apparent than real, being likewise more 

 marked in some individuals tlian in others. The body of the 

 female, towards the tail, exhibits a decided tendency to fold upon 

 itself; and in one example this feature was very significant (fig. 3). 

 The lower part of the body preserves a tolerably uniform thick- 

 ness almost to the extremity, where it is suddenly constricted to 



EXPLANATION OF WOODCUT. 



Fig. 1. Sclerostoma Syngamus, male and female. Natural size. 



Fig. 2. Upper part of the same, showing more especially the six-lobed 

 circular lip of the female, and the mode of sexual union. Enlarged. 



Fig. 3. Lower end of the body of the female, with its mucronate caudal 

 ajipendage. Enlarged. 



Fig. 4. Lower end of the body of the male, showing the cup-shaped 

 bursa, hard rays, lateral muscles, bifurcate penis, digestive tube, and 

 rounded tail. Magnified 30 diameters. 



Fig. 5. Mature egg. X 220 diam. 



Fig. 6. Egg, with contained embryo. X 220 diam. 



form a short, narrow, mucronate, pointed taU scarcely visible to 

 the naked eye. Employing a pocket-lens, it is easy to observe 

 through the transparent integument the spacious digestive canal, 

 surrounded on all sides by sinuous foldings of the ovarium, tuba, 

 and uterus, — the vagina terminating laterally at a point coi'respond- 



