52 ON A GYROCOTYLE FEOM CHIM.flRA, 



The spinules (fig. 6) are dark brown or black. Each is a stout 

 cylindrical rod swollen towards the middle, and with the proximal 

 extremity slightly constricted off as a. rounded knob. They con- 

 form in shape exactl}'- to the description of those of G. iirna given 

 b}' Lonnberg. If we are to judge from Spencer's figure the 

 spinules of G. rugosa are of simpler shape. They are mainly 

 confined to the dorsal surface, but at the anterior end at the sides 

 of the sucker and on the stalk of the funnel a number extend on 

 to the ventral surface. Over the rest of the ventral surface are 

 scattered a very few ; these are all much smaller than those on 

 the dorsal surface. There are very few on the lateral plaits, and 

 none on tho funnel. As in G. urna and G. rugosa, they all lie 

 with their apices directed forwards or forwards and outwards. 

 The longest are 0*3 mm. in length. 



On the right border, not far from the anterior extremity (fig. 2), 

 in both specimens, is a well-marked notch. On the dorsal aspect, 

 close to this is the conspicuous aperture of the vagina (9). The 

 male aperture is on the ventral surface, a little to the right of the 

 middle line, and slightl}" behind the vaginal opening. There is 

 no cirrus distinguishable in either specimen. The ejaculatory 

 duct has a chitinous internal lining beset with fine denticles or 

 spinules as in most Cestodes. These appear to be absent in G. 

 rugosa, but are present in G. arna.* 



The specimens were not in good condition for minute investi- 

 gation, and I have not attempted more than a general examina- 

 tion of the structure of the remainder of the reproductive 

 apparatus. So far as my results go the}" correspond with what 

 has been described by Lonnberg and by Spencer. As Lonnberg 

 has stated, the continuation backwards of the vagina to the 

 receptaculum seminis is a very fine tube which runs on the ventral 

 side of the uterus, and not on the dorsal as represented by Spencer 

 in his coloured diagram. The main vitelline ducts also, which are 

 represented in the same figure on the dorsal side of the ovary, 

 are in reality ventral in position. 



* Obviously what Lonnberg (4, p. 38) refers to as cilia are of this nature. 



