456 WILLIAM NICOLL. 
the ovary and possibly also of the testes; (3) the length of 
the cirrus-pouch; and (4) the presence of. distinct pars 
prostatica. 
Of the remaining unclassified forms nearly related to the 
ALLOCREADIINE I shall refer here only to those described by 
Stossich? and Linton.? Of these Distomum umbrinez 
Stossich, as already indicated by Odhner, probably represents 
a distinct genus type, the characteristics of which are: (1) the 
rather stout, broad body; (2) the very short (or absent) 
cesophagus; (3) the long cirrus-pouch reaching the ovary ; 
(4) small round testes; (5) globular ovary (on left?) ; (6) 
median genital aperture; (7) yolk-glands confined behind 
ventral sucker. ‘These form a group of features sufficiently 
important to exclude the species from any of the already 
formed genera. Distomum obovatum Molin and D. 
mormyri Stoss. bear much resemblance to each other and to 
D.umbrine Stoss. They differ from the latter, however, 
in the flatter body, the apparently lateral position of the 
genital aperture, the yolk-glands extending into the neck, 
the ovary on the right side and the transverse oval shape of 
the testes. These three species are probably more nearly 
related to Peracreadium than to any other genus. Another 
species which appears to approach those in some degree is 
that depicted by Linton in fig. 165 and found inSphenoides 
maculatus. It is characterised by a very small ventral 
sucker, a cirrus-pouch just extending beyond the sucker, 
transverse testes and yolk-glands confined behind ventral 
sucker. Distomum scorpene Rud. Stoss. (I, p. 158, 
fig. 20) is an extremely doubtful member of the sub-family. 
It is characterised by the peculiar shape of the body® and of 
the cesophagus. Otherwise it bears a distinct resemblance to 
Podocotyle, but the ovary is globular and the cirrus-pouch 
may prove to be of unique structure. Dist. fasciatum Rud. 
1 Brani Elmint. Tergest.,” in ‘ Boll. Soc. Adriat.,’ ix, No. 1 (1885), 
pp. 158-161, pl. iv-vi; and No. 2 (1886), pp. 44-49, pl. viii. 
2 Parasites of Fishes of Beaufort, North Carolina,” in ‘ Bull. Bur. 
Fisheries, U.S.A.,’ xxiv (1904), pp. 321-428, pl. xxii—xxiv, xxviii. 
3 This peculiar shape can, however, often be observed in Podoco- 
tyle atomon. 
