32 DESCRIPTION OF A SPECIES OF ELEOTRIS, 
edge is smooth and also like the Monitor tooth, it has the basal 
fluting extended higher on the inner side towards the crown 
than in Hydrosaurus. On the other hand, its shape and the 
almost entire want of the ridge descending upon the outer side 
of the tooth sufficiently differentiate it from that of a Monitor 
proper. We have, therefore, here additional evidence that the 
extinct lizard had greater affinity with the smaller than with the 
larger of these two living genera. 
The length of this tooth is 2:1 ¢.m., its breadth 12 ¢.m.; the 
measurements of a middle tooth of Hydrosaurus are 0°6 e.m. 
and 0:°3 c.m.; of Monitor, 0°3 c.m. and 0°2 c.m.; and from these 
elements of comparison we may estimate the entire length of 
the animal to have been in the mean 18ft. 6in. 
DESCRIPTION OF A SPECIES OF ELEOTRIS 
FROM ROCKHAMPTON, 
BY 
C. W. De Vis, M.A. 
A more frequent imitation of the example set by Mr. W. N. 
Jaggard, of Rockhampton, who is actively engaged in collecting 
the aquatic products of his neighbourhood, cannot be too 
highly recommended to all friends of knowledge: those, perhaps, 
more especially who are resident in the north. The observa- 
tion, most prolific of discovery, is that of the local observer. 
Among several apparent novelities due to the zeal of Mr. Jag- 
gard is one which I have no hesitation in bringing under 
your notice, as interesting in its kind. It is a member of the 
genus Hleotris; a genus, including a great number of species 
of small fishes : some among the commonest in our fresh water- 
pools and brooks : some found only in tidal waters. The nume- 
rous forms have for convenience sake been arranged in two 
