Onchocerciasis in ('attic and Associated Animals. 2',\ 



one caudal (the latter three being grouped together in those descrip- 

 tions as three post-anal). In one specimen seen by Breinl, and one 

 side of one specimen from our material, an additional papilla was 

 present anterior to the usual preanal ones, making eight in those 

 two isolated eases. The exact way in which these occur in the six 

 male specimens of 0. indica referred to is shown in Table 2 and 

 Figure 9, where it will be seen that, with the exception of one side 

 in one ease, the smallest number of papillae is eight on each side, 

 while nine are present nearly as often as eight; and, also, the 

 arrangement is different from that of 0. gibsoni, the additional 

 papillae being adanal and caudal in position, not preanal. It is 

 also interesting to note the occasional occurrence of only threo 

 adanal papillae, as is characteristic of 0. gibsoni, though in two out 

 of these three occurrences the number of postanal (four) characteristic 

 of 0. indica are certainly present; in the other case I could not be 

 positive on the point. Transverse ridges are present at a distance 

 of .005 to .006 mm. apart, cf. .0045 to .0060 mm. in 0. gibsoni 

 (.045 mm. given by Leiper must surely be a printer's error for 

 .0045), and .005 to .006 mm. in 0. bovis, and contrast Neumann's 

 measurements for 0. gutturosa. 



In the case of the female worms (see Table 5) the length and thick- 

 ness of 0. indica falls within the range found in O. gibsoni, with 

 the exception of the tail, which is markedly thinner; the average 

 thickness is, however, distinctly less in 0. indica (except in the 

 middle of the body, while the average diameter of the tail of 0. 

 indica female is less than the minimum given for the tail of O. 

 gibsoni female. The position of the nerve ring is constantly the 

 same as in the highest range given for 0. gibsoni. The length of 

 the oesophagus in the four females of 0. indica, in which it, was 

 measurable, always exceeds that of 0. gibsoni, with the exception of 

 two instances quoted by Breinl. In thickness it is fairly constant 

 in 0. indica, and within the range found in O. gibsoni. The 

 average length and thickness is much greater in 0. indica than in 

 0. gibsoni. The position of the vulva and that of the anus varies 

 much less than in 0. gif>soni, and like each of the other species of 

 Onchocerca, they fall within the range found in 0. gibsoni, though 

 their average positions are much nearer the tip of the head and 

 tail respectively than in that species. The v\z\i. when segmentation 

 is complete, is similar in size to that of O. gibsoni. Eggs contain- 

 ing fully developed larvae are smaller than those of other species, 

 and the larva when just freed from the egg shell is distinctly shorter, 

 .12 to .196 mm. being the length in 0. indica, this range over- 



