H. G. Jackson 
51 
prominent and its lumen is produced posteriorly into a triangular pouch. The 
pharynx is long and the oesophagus very short, the diverticula of the gut are 
very strongly branched externally and internally, and the internal branches 
are ramose. Yolk glands spread on both sides of the alimentary canal. The 
testis area is moderately large, its posterior margin being about one-third 
of the entire length from the tail. The ovary is on the right side and, as in all 
other points of the histology and finer anatomy, is similar to F. hepatica. 
The body is very flat ‘dorsoventrally and covered with moderately large 
spines. The eggs are of sizes lying between 0*140 mm. to 0*160 mm. in length 
and 0*060 mm. to 0*100 mm. in breadth. Average proportion of length to 
breadth 3*2 to 1. 
Locality. Cattle, Bassein and Rangoon. 
RHODESIA SPECIMENS (Text-fig. 3). 1st Collection. 
Longest 39 mm. by 11 mm. Shortest and narrowest 36 mm. by 10 mm. 
Broadest 12 mm. by 37 mm. 
These resemble the Rangoon specimens in general form, but the body 
reaches its greatest length nearer to the anterior end and tapers very gradually 
to a blunt tail. The ventral sucker has a triangular aperture and is slightly 
pouched posteriorly. The general anatomy is as above. The body is very flat 
dorsoventrally and the spines are moderately large. 
Eggs: length 0*150 mm. to 0*170 mm., breadth 0*070 mm. to 0*085 mm. 
Average proportion of length to breadth 3*3 to 1. 
Locality. Cattle, Northern Rhodesia. 
RHODESIA SPECIMENS (Text-fig. 4) 2nd Collection. 
Longest 37 mm. , by 9 mm. Widest 13 mm. by 26 mm. Shortest 25 mm. 
by 10 mm. Narrowest 8 mm. by 36 mm. 
The majority of these specimens are more slender than any described 
above. The slenderness of the body gives the cone an appearance of large size— 
it is perhaps larger in proportion to the body than in the specimens already 
described. The “shoulders” are very slight. The body soon reaches its full 
width and retains it for one-third of its length, tapering posteriorly to a 
bluntly pointed tail. The anatomy is as above. 
Eggs: length 0*130 mm. to 0*175 mm., breadth 0*075 mm. to 0*090 mm. 
Average proportion of length to breadth 3*7 to 1. In many specimens the 
proportion is over 4 to 1. 
Locality. Cattle, Northern Rhodesia. 
NAIROBI SPECIMENS (PI. Ill, fig. 2). 
Three specimens measuring 33 mm. by 7 mm., 35 mm. by 6 mm., and 
34 mm. by 6 mm. and differing in slight points from those described above. 
The body is very slender and the large cone is, at its base, as wide as the 
body, no “shoulders” being present. It expands slightly for about one-third 
4—2 
