174 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



Genus 4. — Breynia, Desor, 1847. 



Test thick, remarkable for three fascioles, peripetalous, anal 

 and internal, only associated in this genus. Large tubercles 

 deeply sunken, enclosed within the peripetalous fasciole. 



Breynia Australasia, Leach. 



A large urchin, from 60 to 75 mil. in diam, the test a deep 

 chocolate colour, and clothed with a brownish fur of spines, on 

 which the fascioles are very distinct. Found from Cape York to 

 Port Jackson, and sometimes 80 millim. in length. 



Genus 5. — -Echinocardium, Gray, 1825. 



Test thin, swollen, petals triangular, with internal fasciole, 

 anterior groove distinct, and with small pores. Anus in a 

 truncated posterior extremity. Sub-anal fasciole with ascending 

 branches round anal system. Actinal spines long and spathulate, 

 the others fine and silky. 



Echinocardium australe, Gray. 



A somewhat high test, with central apex, mouse-colored or 

 brown. Common in S. E. Australia as far as Port Stephens, and 

 in all Tasmania, Bass' Straits, S. Australia, as far as W. Australia. 



Found in 15 to 20 fathoms, on sandy mud. 



Genus 6. — Brissopsis, Agassiz, 1840. 



Bkissopsis luzonica. A small urchin, with short confluent ambu- 

 lacra, which form conspicuous long crescents, and a peri- 

 petalous and sub-anal fasciole. Very thin. I do not enter 

 into the details of the genus, as its Australian habitat is entirely 

 doubted by me. Still it has been reported as from tropical 

 Eastern Australia. 



Genus 7. — Metalia, Gray, 1855. 



Test with a more or less broad elliptical undulating or re- 

 entering peripetalous fasciole, and an anterior A. groove. Lateral 

 A. petals narrow, elongate, pores well separated, apex anterior, 

 actinal plastron narrow, hcarl-sliaped, sub-anal area with a broad 



