95 
Leaving America and India, and proceeding to Australia, I return 
to a country which has so long engaged my attention, to characterize 
a new genus of small creeping Insessorial Birds, nearly allied to the 
genera Hylacola and Dasyornis, under the name of Pycnoptilus, of 
which at present only a single specimen is known, and to which I 
beg to assign the specific name of floccosa ; it is from New South 
Wales and the country towards the river Darling. 
Genus Pycnoptilus. 
Gen. Char. —Bill much shorter than the head; gonys and culmen 
gradually descending; upper mandible notched at the tip ; nostrils 
covered with a distinct operculum; base of the bill beset with very 
fine feeble hairs; wings very short, round and concave, the sixth 
primary the longest; tail short, rounded, feathers very broad and of 
a soft texture ; tarsi strong, and somewhat lengthened compared with 
the size of the bird ; hind-toe strong, and armed with a rather long 
claw; fore toes and nails rather feeble, the outer and inner toes of 
equal length; plumage dense, lengthened and silky, especially on the 
flanks. 
Pycnoptilus floccosus. 
All the upper surface, wings and tail rich brown; throat and 
breast sandy buff, the feathers of the latter with a crescent of brown 
near the tip ; remainder of the under surface brown, approaching to 
white on the centre of the abdomen; under tail-coverts rusty red ; 
bill and feet dark brown. 
Total length, 6f inches ; bill, f ; wing, 2f; tail, 2J-; tarsi, 1^. 
Hab. New South Wales. 
Remark. —Received in a collection made on the upper part of the 
river Morumbidgee. 
This form is somewhat allied to Atrichia, Hylacola and Dasyornis, 
but differs from all those genera in several particulars. 
I cannot conclude this paper descriptive of several new and im¬ 
portant birds, without congratulating the Society upon the means 
they possess of making known to the scientific world through their 
Proceedings and Transactions, spread far and wide as they are, not 
only over our own country, but I may say over the world, the many 
interesting objects which from time to time are brought before their 
Meetings ; neither must I omit to bear testimony to the high estima¬ 
tion in which they are held by all the continental naturalists and 
every true lover of scientific research. 
2. Descriptions of two species of Crustacea in the 
British Museum. By Adam White, Assistant Zool. 
Dep. Brit. Mus. 
Potamobius ser^atus. (Annulosa, PI. XV.) 
Cancer serratus, Shaw, Zoology of New Holland, t. 8. 
Beak shorter than the peduncle of the outer antennse, with three 
teeth on the outside, above hollowed and slightly grooved down the 
