52 NOTES. 



ECHINANTHUS TESTUDINAEITJS. 



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 5 inches ; 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 PEKONII. 



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 fathoms 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. 



AEACHNOIDES 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 ME. SMITHHUEST, of the "Dingadee," in 

 10 fathoms, near Freycenet 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 East and North Coasts, and is particularly plentiful off 

 Port Denison in 3 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 1 have 

 met with in which the young are carried, until their spines are 



