[329] THE BRYOZOA 237 



obscured. The top spreads out into a rounded head whose diameter 

 is greater than that of the stalk. Upon the surface the orifices are, for 

 the most part, closely approximated and assume a hexagonal shape. 

 A very few project slightly and are circular. The transition from the 

 top of the column into the mound-like surface is not definitely marked 

 by any border or rim such as is shown for Stomatopora fungia 

 (Hincks J 8o) or for Tubulipora pencillata (Smitt '66). The second 

 form, represented of natural size in fig. 12, is white in color, and was 

 obtained at low tide, partially incrusting a hydroid stem. In this case 

 the colony has attached itself by encircling the stem in an irregular 

 way, and has formed a column terminated by the mound-like head. 



Family LICHENOPORID^. 



LICHENOPORA Defrance. 

 LICHENOPORA VERRUCARIA Fabricius. 

 Uchenopora -verrucaria HINCKS ('80), pi. LXIV, figs. 4, 5. 

 Habitat. Upon Cellaria borealis. 



Local distribution. Orca ; Virago Sound, Queen Charlotte Islands. 

 Foreign distribution. Bahusia ; Norway ; Finmark ; Arctic seas ; 

 Bay of Fundy ; St. George Banks ; Britain, north and west. 



Suborder CTENOSTOMATA Busk. 

 Family ALCTONIDIID^E. 



ALCYONIDIUM Lamouroux. 

 ALCYONIDIUM GELATINOSUM Linnaeus. 



Alcyonidium gelatinosum HINCKS ('80), pi. LXIX, figs. 1-3. 

 Halodactylus diaphanus FARRE ('37), pis. xxv, xxvi, figs. 1-16. 



Local distribution. Muir Inlet; Orca; Garforth Island; Virago 

 Sound, Queen Charlotte Islands. 



Foreign distribution. Coasts of Britain ; Norway ; Sweden ; North 

 America ; White Sea ; Nova Zembla ; Kara Sea ; Natal. 



ALCYONIDIUM MYTILI Dalyell. 



Alcyonidium mytili HINCKS ('80), pi. LXX, figs. 2, 3. 

 Alcyonidium parasiticum SMITT ('65), pi. v, figs. 8-19. 



Habitat. Growing on ascidians, shell, and on Fucus. 

 Local distribution. Sitka ; Yakutat ; Fakir Islet ; Garforth Island. 

 Foreign distribution. Bahusia, 5-20 fms. ; Baltic Sea ; coasts of 

 Britain. 



