[3 2 9] 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 '80) 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 LICHENOPORIDJE. 



LICHENOPORA Defrance. 

 LICHENOPORA VERRUCARIA Fabricius. 

 Lichenopora 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 my tili 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. 



