OF NEW SOUTH WALES. 247 



behind. I have only seen dried specimens, and can say nothing 

 of the colours ; on the caudal there is a mark of a rather narrow 

 black band placed obliquely on each lobe. 



This sort seems to be rather common in Hobson's Bay, and 

 attains from ten to twelve inches long. The first specimen I saw 

 was given to me by Mr. St. John, a most able taxidermist. 



MONOCANTHUS PERONII. 



I have obtained a specimen of this sort from Hobson's Bay. 

 which would be according to Dr. Gunther a male ; it has on 

 each side of the tail an elongated patch of long, straight, slender 

 but very stiff bristles, having entirely the form of a tooth brush ; 

 these bristles or spines are higher in the centre where they are 

 nearly an inch long ; the specimen is near ten inches long, and 

 has been dried ; in that state the colour is of a rather light 

 brown, marked on the lower parts with light grey ; the skin is 

 covered with very small tubercles. 



Note. — A careful comparison has satisfied me that my 

 Monacanthus obscurus is identical with my M. margaritifer ; the 

 differences observed are only due to the state of preservation of 

 the specimens ; the first is dried and from Swan River ; the 

 others were in liquor and from South Australia. 



TETRODON BtBRONI. 



Body naked ; snout obtuse and short ; eye nearer to the end of 

 the snout than to the gill opening ; the interorbital space is flat ; 

 its breadth taken at the centre of the eye, is equal to one-half the 

 distance, from the end of the snout to the base of the dorsal ; it 

 has no ridges ; all the upper part of the head is rugose ; the belly 

 has a rugose appearance, caused by a quantity of very minute 

 spines. The colour is dark purple with the lower parts white ; 

 three broad black bands cross the upper part of the body, one over 

 the eyes, one behind the pectorals, the other shorter, almost 

 round, at the base of the dorsal ;fins white. 



The specimen is two inches and a-half long, and comes from 

 the entrance of the Brisbane River, in salt water. 



