233 



cattle killed in the Melbourne Abattoirs. Piettre (1912) 

 recorded the presence of 0. bovis in 26 out of 30 cattle 

 examined in France, and in the cervical region of 65 per 

 cent, to 70 per cent, of Argentine animals and of 90 ner 

 cent, of Uruguayan cattle killed at the meat preserving works 

 in those two countries (Piettre, 1916; Joan, 1917V Emery 

 (in Neumann, 1910, p. 270) reported that 0. gutturosa was 

 to be found in the connective tissue of the neck ligament, 

 principally on the inner face, and especially at the level of 

 the second and third dorsal vertebrae in Algeria and Tunis, 

 where, he states, nearly all adult bovines harbour the 

 parasite. It is worthy of note that Piettre (1912) failed to 

 find 0. bovis in the cervical ligament of French cattle, 

 though he recorded it from the stifle joint and from the 

 tibio-tarsal ligament. 



We have not been able to determine the length of the 

 female worm. Joan (1917, p. 448) gives it as being over 

 60 centimetres in Argentine specimens. Piettre found that 

 in French specimens the total length of fragments exceeded 

 26 cm., while in Argentine worms (1916) it was about 70 cm. 



Males (from Queensland cattle) measured from 24 to 

 33 mm.- in length. Piettre gives 40 to 50 mm. in the case of 

 French material. T. Joan mentioned that one of the males 

 studied by her measured 57*5 mm. 



Description of Female. 

 Figs. 3, 7, 9, 16, 18, 19, 25. 



The female body tapers gradually towards the anterior 

 end, but rather abruptly at the posterior extremity. 



The head end (figs. 3, 16) is gently rounded in front 

 and, at least in some specimens, appears to possess a few minute 

 papillae. The cuticle is smooth as far back as the region of 

 the termination of the long oesophagus. The width of the 

 body in front of the nerve ring is from '05 to *06 mm. In 

 the region of the latter there is a dilatation, so that the body 

 measures *07 to '075 mm. in diameter. Behind this it nar- 

 rows slightly to become again somewhat dilated at the level 

 of the vagina, where the body diameter reaches '070 to 

 *085 mm. The first (cervical) dilatation is situated at from 



Figs. 1 to 3, heads of females. 1, 0. gibsoni. 2, 0. lienalis. 

 3, 0. gutturosa. 4 to 6, heads of males. 4, 0. gutturosa. 5, 

 0. gibsoni. 6, 0. lienalis. 7 and 8, female tails. 7, 0. guttu- 

 rosa. 8, 0. lienalis (ridges only roughly and partly indicated). 

 9, part of 0. gutturosa, showing female aperture, a, anus; 

 p, papilla; v, vagina. Figs. 1 to 8, drawn to the scale indicated; 

 9, drawn about four times that scale. 



