286 SoiitJicrn Cross. 



XVI. P O L Y Z O A. 



By i;. KIKKPATRICK. 



The Poly/oa obtaiuecl from the Antarctic region comprise eight 

 species and one variety, one species being new. The seven known 

 species have all been found before in the Southern hemisphere, 

 either off Australia, Kerguelen Island, or Cape Horn. The specimens 

 encrust seaweed and tubes of SpirorUs antarctica. The list of 

 species is as follows : — 



1. Forella hyadesi, Jullieu. 



2. Liversiula nutrix, Jullien. 



3. Schizoporella hyalina (Linn.), normal form. 



3a. „ „ „ var. discreta, Busk. 



4. „ eatoni, Busk. 



5. Smittia landsborovii, Johnston. 



6. Idmonea organizans, d'Orbigny. 



7. Li'-henopora cnnaNcuIata, Busk. 



8. Akyonidium JlabelH/orme, sp. n. 



PORELLA HYADESI. 



1888. Porella hyadesi, Jullien, ' Mission Scientifique Cap Horn.' Zoolugie. 

 Tom. VJ., ' Bryozoaires,' p. 56, PL ill., fig. 5. 



The two specimens in the present collection differ from the 

 description and figure by Jullien in having a vrall-like prolongation 

 on each side of the orifice ; but this feature is much more pronounced 

 in one specimen than in the other ; in orecial cells the lateral walls 

 fuse with the mucronate avicularian cell and with the ooecia to form 

 a square secondary orifice. There is a specimen from Port Phillip 

 in the Busk Collection labelled (wrongly, I think) Porella rostrata 

 (Hincks), which differs from Jullien's type only in having minute 

 rounded mammillae on the surface. 



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



Distribution. — Port Phillip, Victoria ; Tierra del Fuego ; Cape 

 Adare. 



