50 NOTES. 
AMBLYPNEUSTES OVUM. 
This is the common Port Jackson species, and one of the most 
beautiful of all Urchins—the colors vary from rich deep orange 
to olive both of the test and spines; those from Port Jackson 
are of a uniform rich orange, the test varies considerably in 
form, some much higher than wide, others having the axial 
diameter less than the horizontal, and appear flattened ; the size 
of the anal system and anal pores varies considerably, as also do 
the pits at the angles of the plates. I have over a hundred 
specimens from Port J ackson and Botany, and from several of 
the sea beaches along the coast, but can only find two distinct 
species among the whole. The form of the test cannot be taken 
as a specific difference in this genus. 
AMBLYPNEUSTES GRISEUS. 
This appears to me to be a doubtful species, or perhaps 
I have not yet met with an authentic specimen ; nevertheless, 
those which I have determined to be of this species, agree as 
well as can be expected with PRrorEessor AGassiz’s description. 
Several large specimens, 2°3 x 1°75 in., lately received from 
Tasmania show indications of sculptures like those of A. formossus. 
AMBLYPNEUSTES FORMOSUS. 
A very beautiful species, easily determined by the elegant 
sculpture on the coronal plates. The only specimen I have at 
present was found washed up on “ Queen’s Beach,’”’ in Botany 
Bay. 
HOLOPNEUSTES POROSISSIMUS. 
I have seen no authentic record of this species being found 
on the N. 8S. Wales Coast, although it is reported from the East 
and South Coasts of Australia; but I have recently obtained 
specimens from Cape Liptrap, spines greenish with the tips 
purple. Holopneustes purpurescens must be looked upon as a 
rare species if a good species at all. Three species—H. inflatus, 
H. porosissimus, and H. purpurescens—are somewhat doubtfully 
recognized by Agassiz, and without a large series of specimens 
it is almost impossible to distinguish these varieties; it is quite 
- likely that they all belong to one species. 
ECHINUS DARNLEYENSIS. 
This species, described by the Rev. J. E. Tentson-Woops, 
was first found in tolerable numbers on the shores of Darnley 
Island, and other parts of Torres Straits. It appears to be closely 
allied to, if not identical, with H. angulosus of A. AGassiz. 
