30 NOTES ON AUSTRALIAN CHAETOGNATHA, 
slender and apparently not serrated. Tactile papillae 
were present on nearly all, and in the mature forms the 
tail was filled with sperm morule. 
Australian localities: Port Jackson (June, 1907) ; 
also Shark Bay, Western Australia (Ritter-Zahony, 1910, 
p.126); Great Sandy Island, Queensland (Ritt.-Z., 1909, p. 
792). 
Also recorded from the Atlantic Ocean; the East 
Indies ; Japan; the Maldives; the Indian Ocean: the 
Mediterranean Sea; Southern California; the Straits of 
Magellan. 
2. S. australis Johnston. 
We have re-examined specimens of this species, declared 
by Ritter-Zahony (1911, p. 13) to be a synonym of S. enflata, 
and have come to the conclusion that the species is valid. 
There are four transparent, flaccid species with which it 
might at first sight be confused, but from all of which it 
is distinguished by the possession of a bilobed tail. They 
are S. enflata, S. hexaptera, S. pulchra, and 8S. lyra. 
From S. enflata it differs markedly in the relative posi- 
tions of the anterior fin and ventral ganglion. Ritter- 
Zahony (1911, p. 13), says, “‘ Vorderflossen schmal, abger- — 
undet, von Bauchganglion um dessen mehrfache Lange 
entfernt,’’ which is borne out by his diagram in which the 
interval between the two is at least the length of the fin. 
As shewn in the original figure of australis (Johnston, 1909), 
the anterior fin begins in front of the ganglion. There 
is also a difference in the position of the widest portion of 
the posterior fin, this being at the tail septum in enflata, 
but behind the septum in ausiralis. Again, the former 
has a small collarette, but no such structure has been 
observed in the latter. 
From S. pulchra it is distingushed by the well marked 
neck, the presence of rays in the fins ; also the maximum 
number of jaws in pulchra (7) is the minimum in australis 
(7-11); the tail percentage is lower in australis (16.5%, 
as compared with 18% in pulchra). 
From S. hezxaptera it differs in the number of anterior 
teeth (1-4 hexaptera ; 6-12 australis); in the number of 
