NOTES ON DERWENT ESTUARY FISHES. 



By Robert Hall, C.M.Z.S. 



(Read July 8, 1912.) 



When, in August, 1909, the Harbour Trust were re- 

 placing the piers of Hobart, I took advantage of the oppor- 

 tunity to examine the old piles as certain of them were 

 lifted from the water. 



There were four species of interest ; with a fifth taken 

 on a Field Naturalists' Club expedition down the river. 



1. Blennius tasmanianus, Rich. 



2. Clinus persipicillatus, Cuv. and Val. 



3. Tripterygium clarkei, Morton. 



4. Cristiceps australis, Cuv. and Val. 



5. Trachinops caudimaculatus, McCoy. 



1. Blennius tasmanianits. — Of this species I collected 

 sixty specimens from the dismembered end of one pier, and 

 within the same week; young, adult, and apparently all 

 intermediate stages. 



In the mature specimens just placed in spirit, and 

 four inches in length, there are no less than four types, 

 being variously graded between d6ep brown and cream- 

 white. The structural characters do not vary among them- 

 selves. 



Briefly put, the variations are : — 



a. Uniform deep violet-brown, with almost obso- 

 lete transverse bars, too indistinct to be 

 counted. 



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