THE BRYOZOA 329 



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 'So) or for Tubulipora pcncillata (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. 

 LICHENOPOPLA VERRUCARIA Fabricius. 

 Lichenopora vernuaria Hincks ('80), pi. lxiv, figs. 4, 5. 

 Habitat. — Upon Cellaria horealis. 



Local distribution.— Oxz^ ; Virago Sound, Queen Charlotte Islands. 

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

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



Suborder CTENOSTOMATA Busk. 



Family AL CYONIDIIDM. 



ALCYONIDIUM Lamouroux. 



ALCYONIDIUM GELATINOSUM Linnsus. 



Alcyonidiujn gelatinosum Hincks ('80), pi. lxix, figs. 1-3. 

 Halodactylus diaphMius Farre ('37), pis. xxv, xxvi, figs. 1-16. 



Local distribution.— MyxixlxiX^V, 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. 



Alcyonidiiim 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.— S\t\i^ ; Yakutat ; Fakir Islet ; Garforth Island. 



Foreign distribution. — Bahusia, 5-20 f ms. ; Baltic Sea ; coasts of 



Britain. 



