232 
MEMOIRS OF THE QUEENSLAND MUSEUM. 
After about a month I siphoned half the water out of the tank and renewed 
with fresh water of the same temperature. The fish lived and I took the first 
measurements on March 4th, 1934, when they had attained the length of 50 mm. 
Colour : dark chocolate above and just a shade lighter below. 
Now came the time to transfer the fish to a bigger tank and I was dubious 
as to how they would stand the change. 1 prepared a tank, size 55 x 30 x 30 cm., 
well planted with Hydrilla and Vallisneria, and formed a kind of grotto with some 
large smooth stones. Height of water 15 cm. The fish stood -the change well and 
disappeared at once among the stones. The new tank also contained the above- 
mentioned sediment to a depth of about 15 mm. Now I fed them with mosquito 
wrigglers, Enchytrae worms, finely-shredded raw beef and crushed aquatic snails. 
When measured on May 25th the fish were 75 mm. The colour then was dark 
chocolate above and below, with mottled lighter spots, also five distinct black spots 
on both sides of the tail. The water was raised to full height of aquarium (30 cm.). 
On July 10th the bigger of the two fish was 103 mm., the other fish was about 10 
mm. shorter. 
There is not much to write about the behaviour of the fish, as they lead a 
rather quiet and sedate existence ; they are essentially “ bottom feeders” and 
approach their food with jerky movements. They resemble very much the Mexican 
Axolotl in their movements, but they move like lightning when touched ; in fact- 
one jumped right out of the aquarium on one occasion. They prefer to rest in the 
sediment and it is my opinion that a layer of this is of vital importance in rearing 
Ceratodus. 
One of the two specimens measured on August 23rd, 1934, w r as 122 mm., in 
maximum length. 
Another specimen reared from ova obtained from Mr. George Sigg, Drinan, 
near Bundaberg, Burnett River, attained a length of 156 mm. in the course of 
tw r elve months in similar conditions. 
Editor's Note .— The tw^o Ceratodus were placed in the Bancroft Memorial 
Aquarium in the Queensland Museum on March 21st, 1935. One was approximately 
eight inches in length, the other being distinctly shorter. References to Dr. T. L. 
Bancroft s published work on Ceratodus will be found in the paper on Juvenile 
Lungfishes (Memoirs of the Queensland Museum, Vol. IX, 1928, pp. 160-173). 
