

552 RECORDS OF THE S.A. MUSEUM 
Gonzra FLUVIATILIS J. and M. 1940. 
This short, thick, maggot-like nematode was deseribed originally (J. and M. 
1940, 342) from Plectroplites, MceCullochella and Percalates; and lavyal stages 
were recorded from Nannoperca and Tandanus from Tailem Bend and from 
Mogurnda adspersa from the Burnett River, Queensland, We have identified the 
species from Plectroplites ambiguus from the Thompson River at Longreach, 
Western Queensland; and in a dead specimen of the same species of fish from 
Murray Bridge we found that the liver was extensively burrowed hy adults of the 
parasite, 
Larval stages have now been collected from the omentum of Perculates 
colonorum and McCullochella macquariensis, from both of whieh fish adults 
had previously been collected. Very small larvae are to be found in Yandanus 
tandanus occupying spherieal, or somewhat flattened and lenticular, pedunen- 
lated cysts, measuring about +35 mm. in diameter and each containing a larva 
about *8 mm, in length. 
SPINITECTUS PLECTROPLITES J, and M, 1940. 
Syn. 8. percalates J, and M. 1940. 
From Pleelroplites ambiguus. The species was described originally from 
females only ; but males have now been collected from the type host, and have been 
found to agree in length and in the features of the posterior end, as well as other 
characters, with those of 8. percalates, The latter species was (lifferentiated 
from 8. plectroplites by the length of the vestibule in relation to the position of 
the first ring of spines and to the width of the head. Among the large numbers of 
specimens now available for study, all trom Plectroplites ambiguus, are female 
and male worms with the type of head deseribed as §. plectroplites; others with 
that described as belonging to 8. percalates; as well as others with more or less 
intermediate characters. Tt is therefore suggested that the differences may be 
due to the state of contraction of the worm, or that the character may be variable 
within the species. In all other vespects the worms are sinilar. 8. percalales 
thus falls as a synonym of 8, plectroplites. 
ASCAROPIITS MURRAYENSIS Nl. sp. 
(Fig. 7-8.) 
From the callop, Plectroplites ambiquus. 
Female, 8-1-5-4 mm. long; vestibule 90-93, long; anterior narrower part. 
of oesophagus -18--19 mm. long, posterior part -4--8. Nerve ring at ‘1 mm. 
and exeretory pore at ‘13 mm, from head end respectively. Vulva at about 
middle of body, Eggs, 28% 19p, 
