ON SO:\rE QUEENSLAND TREMATODES. 
369 
forwards in a fairly straiglit course, more or less parallel to 
the cirrus sac, and about equal to it in length, to the genital 
opening. The coils of the uterus in a lateral direction reach 
the outer excretory trunks. There is no Laurer’s canal nor 
receptaculum seminis. 
The yolk-glands are situated laterally behind the testes. 
Each lateral mass consists of grape-like groups of oval 
follicles, which are small oval bodies varying from 0‘099 by 
0’064 to 0T07 by 0*077 mm. There are 12 to 15 follicles in 
each group; and each lateral mass consists of about 50 of 
these groups. 
The eggs are thin-shelled, 0*026 mm. long by 0*015 mm. 
broad, operculated, and with a long fihiinent at, each end 
(fig. 2, a and h). The filaments vary a good deal in length, 
apparently becoming longer during their passage along the 
uterus ; for while those eggs in the first few coils of the 
uterus, near the ovary, generally possessed quite short fila- 
ments, all the eggs in the more distant coils had quite long 
filaments, up to 0*279 mm. long, i. e. more than ten times 
the length of the egg. 
Rhabdiopceus appears to me to be a member of the 
family N otocotylidse Liilie and sub-family N otocotylinm 
Kossack ( 18 ), in spite of the absence of the rows of glands 
on the ventral surface generally found in members of this 
group, and in spite of the presence of the complex proboscis. 
These two structural characters are special features of perhaps 
generic rank, but not, in my opinion, of sufficient importance 
to separate the form from Kossack^s sub-family. In their 
general organisation they agree well with the members of 
that sub-family ( 18 , p. 554), coming nearest perhaps to Cata- 
tropis Odhner ( 48 ). The general arrangement of the repro- 
ductive organs and their ducts agrees fairly well with what 
obtains in Catatropis, e.g. the position and form of the 
testes and ovary ; the form and situation of the vesicula semi- 
ualis, cirrus sac and cirrus, of the uterus and vagina; the 
vitelline glands, however, differ in lying behind instead of 
in front of the testes. The structure of the excretory system 
