NEW TREMATODES FROM REPTILES. 



679 



of parenchymatous tissue is very much reckiced. This is more 

 particularly the case in the post-acetabular region. It gives rise 

 to a reticulated appearance, which is strikingly seen in young 

 specimens (PL XXVII. fig. 1). In older specimens it is obscured 

 by the growth of the uterus. 



The genital glands ai-e difficult to distinguish in the adult, but 

 are easily seen in younger specimens. The testes lie not very far 

 behind the ventral sucker, near and internal to the ends of the ' 

 intestinal diverticula. They are obliquely situated, the left testis 

 being half its diameter in advance of the right, and they are 

 separated from each other by the uterus. In a young specimen, 

 the uterus being narrow, they lie quite close together, but they 

 are pressed further and further apart by the growth of the uterus. 

 They are flat, elongated oval bodies measuring at least -8 x "4 mm. 

 Their outer margin is plain, but their inner margin is indented 

 in one or more places, so that the outline is somewhat irregular. 

 At first they lie almost flat in the body, but the expansion of the 

 uterus pushes their inner border towards the dorsal surface so 

 that eventually they are considerably tilted. 



The genital aperture is situated on the left side midway between 

 the phai-ynx and the edge of the body. It is always on the level 

 of the pharynx. The cirrus-pouch is of considerable length, and 

 is a conspicuous object. It is elongated, somewhat slender, and 

 extends to the middle of the ventral sucker. Its wall is remarkable 

 for the great development of the longitudinal muscular fibres, 

 which are stout and very prominent. The circular fibres are 

 much smaller. Within the pouch there is a more or less highly 

 convoluted vesicula seminalis. Usually it is simply bent double 

 (PI. XXVII. fig. 2), but frequently it is much more twisted. It 

 is small compai-ed with the size of the cirrus-pouch. It is not 

 much dilated, and it is connected with the pars prostatica by 

 a narrow duct. The pai's prostatica is of relatively great length. 

 It is an almost straight tube extending from a little in front of 

 the ventral sucker to the point where the cirrus-pouch crosses the 

 left intestinal diverticulum. It is uniform and fairly narrow. 

 Surrounding it are numerous prostatic cells which fill up the 

 greater part of the cirrus-pouch. The ductus ejaculatorius is 

 short and narrow, and the exsertile, unarmed cirrus is not very 

 long. The genital sinus is quite small. 



The ovary is situated just behind the end of the cirrus-pouch, 

 over the right posterior quadrant of the ventral sucker. Half of 

 it lies beyond the sucker, and it frequently overlaps the adjacent 

 intestinal diverticulum. It is an almost globular body, somewhat 

 flattened dorso-ventrally, and is about half the size of the testes. 

 Behind and internal to it lies a compact shell-gland, with a short 

 ootype and a Laurer's canal, but no receptaculum seminis. 

 Laurer's canal is short and opens dorsally in the middle line, 

 about the level of the ovary. A small yolk resei-voir lies dorsal 

 to the shell-gland. The yolk-glands are of limited extent. They 

 are entirely lateral and lie close to the outer side of the intestinal 

 diverticula. On each side there are about half a dozen ill- defined 



