243 



As already pointed out by Dr. Sweet, the male may 

 possess a large papilla situated well in front of the cloaca. 

 In a favourable preparation, generously placed at my disposal 

 by Dr. Ferguson, such a preanal pair is followed by three 

 perianal pairs, a well-marked postanal, and a caudal group 

 of three pairs — one being a large precaudal pair, followed 

 by two smaller pairs, close to the tip of the tail — making a 

 total of eight pairs. 



The amount of fibrosis of the surrounding connective 

 tissues of the host seems to be related to the development of 

 ridges on the parasite, there being extremely little fibrosis 

 surrounding 0. lienalis, whose ridges are very low; a greater 

 amount surrounds 0. gutturosa, and, at times, there may 

 be a slight indication of nodule formation, while the strongly 

 corrugated forms, like 0. gibsoni, 0. indica, 0. fasciata, and 

 0. volvulus, give rise to a well-marked nodule formation. 



Onchocerca fasciata, Railliet and Henry, 1910. 



Fig. 23. 



Attention was drawn by Dr. Cleland and the author, 

 in 1910, to the presence of a worm nodule-producing Oncho- 

 cerca (identified as being perhaps 0. gibsoni) in camels im- 

 ported from India into Western Australia. In the same 

 year Railliet and Henry (C.R. Soc. Biol., 68, 1910, p. 250) 

 gave the species the above name, describing it as follows : — 

 Female alone known from fragments without extremities; 

 thickness, 400 to 475 micra; cuticle with slightly undulating 

 ridges, repeated at every two or three striae; from a sub- 

 cutaneous nodule from the head of a dromedary, Punjab. 

 [The host was incorrectly listed by Dr. Sweet (1915, p. 31) 

 as Cameius bactrianusP[ 



In our original account (1910, pp. 177, 178, 189) we 

 mentioned that the anterior end and body fragments of the 

 female specimens, examined by us,, showed similar characters 

 and measurements to those of 0. gibsoni, and that the vulva 

 was similarly placed. 



A re-examination of some fragments, collected by Prof. 

 Cleland from Western Australia, and now in the writer's 

 collection, shows that the maximum body diameter is from 

 '40 to "45 mm., and that the irregularly sinuous and knobbed 

 ridges are from '07 to '09 mm. apart (fig. 23). Between the 

 ridges are two to four, usually three, striae. The ridges are 

 from 7 to 9 micra in height on the mid-body. The larval 

 measurements resemble those of 0. gibsoni, viz., length *18 

 to '20 mm., and breadth '003 mm. 



