148 DR. W. NICOLL ON TREMATODE 
suspicion that this could not be the case. It was difficult, how- 
ever, to obtain other grounds for regarding them as a distinct 
species. These relate only to slight differences in the size of the 
suckers, the cirrus-pouch, and the ova. 
The body in its contracted state is plump and equally rounded 
at both ends. In some specimens each end is curled ventrally. 
The length of the smallest specimen was °75 mm. and of the 
largest 1-4 mm., though the latter had been subjected to a certain 
amount of pressure. In the natural state the length is probably 
1-15 mm. The greatest breadth, in the middle of the body, is 
‘4-65 mm. ‘The cuticular spines are rather minute. 
The suckers are more unequal than in B. salamandre. The 
diameter of the oral sucker is -17—25 mm., the average being 
22mm. The ventral sucker only measures -11—15 mm., with 
an average of -135 mm. ‘The ratio is therefore very nearly 5:3 
instead of 5:4, as in B. salamandre. The ventral sucker 1s 
also nearer the middle of the body, being about two-fifths of the 
total length from the anterior end. 
The pharynx measures ‘075 x-07 mm.; the csophagus is 
short, and the dilated intestinal diverticula reach the level of the 
middle of the ventral sucker. 
The genital aperture has the same position as in B. salamandre, 
but the cirrus-pouch is much longer and more slender, and it 
extends right across the ventral sucker to its posterior border. 
Tt contains a very large bipartite vesicula seminalis, of which the 
posterior portion is the larger. The transversely oval ovary lies 
on the left side caomnerlietielly behind and overlapping the ventral 
sucker. Just behind it, and a little externai, lies the left testis, 
while on the other side, on the same level, lies the right testis. 
The ovary measures -13x‘07 mm.; the testes are somewhat 
larger. The yolk-glands extend from about the middle of the 
oral sucker to the level of the ovary. The uterus is very volu- 
minous, and fills up the whole of the posterior part of the body. 
The arrangement of the convolutions cannot be made out, as 
they are so closely packed together, but it is noticeable that 
most of the young eggs are near the tail, while the older eggs 
occupy a more forward position. The eggs are thick-shelled and 
somewhat larger than those of B. salamandre, measuring 
*050—052 x 034-036 mm. 
This species differs from B. hospitale Stafford (1903) in having 
relatively larger and more unequal suckers. The intestinal 
diverticula are somewhat longer, and the ova are considerably 
larger. It is altogether a much smaller species. 
Family ECHINOSTOMIDAZ. 
9. EXCHINOSTOMUM ALIUD, sp. n. (PI. IV. figs. 9, 9 a.) 
Four specimens of this parasite were obtained from the intestine 
of a Ruddy Flamingo (Phenicopterus ruber). It is an elongated, 
