52 NOTES. 
ECHINANTHUS TESTUDINARIUS. 
This cannot be considered a common species, it is occasionally 
taken with the trawl and dredge in Port Jackson, but usually 
singly. It is found in from 5 to 20 fathoms on sand, and seldom 
attains a greater longitudinal diameter than 5inches; when alive 
the spines are of a greenish tint, but occasionally light brown. 
LAGANUM DECAGONALE. 
A very common species, found at low tides in about a foot or 
less of water on the sandy spits and beaches from Wide Bay 
northwards. 
LAGANUM PERONII. 
A species tolerbly plentiful in Port Jackson during the warm 
months on sandy bottoms in 5 to 10 fathoms; we have also 
dredged it in 35 tathoms off the coast, both adult and young, the 
immature specimens predominating. Those from the harbour of 
Port Jackson are usually of an olive-green tint, but vary to 
dull brown. 
ARACHNOIDES PLACENTA. 
This is one of the most common “ cake”? Urchins found north 
of Wide Bay. At the mouth of the Herbert River I found it 
in November, 1873, in immense numbers left by the tide on the 
sandy spits near the sea, making their way with tolerable rapidity 
towards the receding waves, and leaving a broad track behind 
them in the sand. 
MARETIA PLANULATA. 
We have recently beautifully marked specimens of this 
species, dredged by Mr. Smrrunurst, of the “Dingadee,”’ in 
10 fathoms, near Freycenét Island, in New Caledonia; the rich 
maroon-brown markings contrast beautifully with the pearly 
whiteness of the test. It is plentifully dispersed over the whole 
of the Hast and North Coasts, and is particularly plentiful off 
Port Denison in 8 to 10 fathoms on sand; those from Port 
Jackson and the N. S. Wales coast generally, are uniformly 
white in color, without blotches, the primary spines sometimes 
exceed the length of the test. 
EUPATAGUS VALENCIENNESII. 
A rare species in Port Jackson, and usually found in 
8 to 10 fathoms of water. It is the only species that I have 
met with in which the young are carried, until their spines are 
