288 Southern Cross. 



A prominent umbo is present on the front surface of each 

 zooecium, and at a little distance from the umbo is a double row of 

 pores separated by a sharp line. A well-marked shield-like area is 

 marked off on the front of each cell. The pores are semi-circular 

 and sharp-edged in the younger, but square and with crenulated edges 

 in older cells ; the pores are not continued round the orifice, but stop 

 short at the ends of the proximal edge ; a row of pores is present, 

 however, round the base of the ooecium. 



The stout oral spines, usually four in number, are articulated at 

 the base. 



The double row of pores is present in the type specimen from 

 Kerguelen, but they are not nearly so apparent or well defined. 



Locality. — Cape Adare, 8 fathoms, on seaweed. 



Distribution. — Kerguelen Island ; Cape Adare. 



SMITTIA LANDSBOROVL 



1849. Lepralia landsborovii, Jolinstou, Brit. Zoopli., Ed. II., p. 3J0. 

 1880. Smittia landsborovii, Hiucks, Brit. Mar. Pol., p. 341. 



A small avicularium with spathulate mandible is sunk deep in 

 the peristome, the secondary orifice of which is clithridiate and flush 

 with the front surface of the zooecium. An umbo is present on each 

 cell just below the orifice, and also on the ocecia. 



Locality. — Cape Adare, 18 fathoms, encrusting Sinrorhis antarctica. 



Distribution. — Arctic Regions, Kara Sea, Jan Mayen, East 

 Greenland ; Norway ; Great Britain ; Florida ; Australia ; Falkland 

 Islands ; Cape Adare. 



IDMONEA ORGANIZANS. 



1839. Tubulipora organizans, d'Orbigny, Voy. Amcr. Merid., Vol. V., 



Fart IV., p. 19, PL IX., figs. 1-3. 

 1879. Tvibulipora organizans, Busk. Pijil. Traus., A'^ul. CLXVIII., p. 198, 



PI. X., figs. 20-25. 



This species is represented by a minute fragment of a colony 

 encrusting seaweed. The zocecia are arranged here, as in the 

 Kerguelen specimen, in regular alternating series, with about four to 

 eight zooecia in each row. 



Locality. —Cape Adare, 8 fathoms, on seaweed. 



Distribution. — Kerguelen Island ; Falkland Islands ; Cape Adare. 



