1919. ] S. Kemp: Liver-fluke of Sheep. 63 
(iv) The main lateral diverticula of the gut are considerably 
more numerous. 
(v) The posterior testis does not extend to the posterior 
third of the body. 
(vi) The eggs are larger. 
In all these characters except the first our Persian specimens 
are constant. In eight of the specimens the length varies from 38 
to 43 mm. and the breadth from 9 to II mm., the proportion of 
length to breadth being from 3°5 to 4°4. Two specimens are 
damaged. The remaining individual is abnormal in form; its 
length is 28 mm., its breadth 12 mm. and it is leaf-shaped in outline. 
In structural characters, however, it is identical with other indivi- 
duals from the same sheep. ; 
The eggs are approximately 156 to 173 p» in length and 86 to 
95 » in breadth. 
The small size of the specimens may possibly be due to the 
fact that they were examined before they had attained their full 
dimensions, though they were sexually mature. We were, indeed, 
informed by the sergeant in charge of the slaughtering of sheep for 
the troops at Nasratabad that he had noticed very much larger 
individuals later in the year. 
In my examination of freshwater snails in Seistan I found no 
cercariae that could be associated with Fasciola, probably because 
the incidence of the parasite in the molluscan host is seasonal. 
Judging, however, from the abundance of shells in the soil of 
inundated land at the edge of the Hamun, the intermediate host is 
probably Limnaea gedrosiana, Annandale and Prashad. As this 
molluse is also common in the hill-country of Baluchistan it would 
be interesting to know whether the fluke occurs there also. 
So far as we are aware F gigantea has not hitherto been 
recorded from Asia. Looss cites F. angusta (Railliet) and F. ae- 
gypttaca, Looss, as synonyms! and states that the species is widely 
distributed in Northern Africa, including Egypt. It is said to 
have occurred accidentally in man in South America. 
! Looss, Zool. Fahrb., Syst., XVI, p. 783 (1902). 
