THE MOUNT DESERT REGION 305 



eaves' specimens were dredged at Metis and Gaspe, in the 

 Gulf of St. Lawrence. 



Idmonea Lamoiiroux, 1821 



Idmonea atlantica Johnston, 1847. PL 1, figs. 5-6. (Os- 

 burn, 1912, p. 217 {Tubiilipora), for synonymy and refer- 

 ences ; 1912 a, p. 276, Browns Bank off Cape Sable, Nova 

 Scotia ; Whiteaves, 1901, p. Ill, for Canadian records.) Com- 

 mon on hard bottoms and taken at thirteen stations. The 

 species is widely distributed in both European and American 

 waters. 



The zoarium is erect and spreading and branched dichoto- 

 mously in an irregular fashion, as much as an inch in height. 

 The zooecia are arranged in series of usually 3 to 5 in parallel 

 rows on the frontal surface of the branch, which is triangular 

 in cross section. The ooecium is an irregular inflation of the 

 middle of the frontal surface between the rows of tubules, 

 usually beginning below a bifurcation and extending up both 

 branches. The ooeciostome is somewhat trumpet-shaped and 

 is turned sidewise at the end of short tube, which is adnate for 

 most of its length to one of the ordinary tubes. 



Lichenoporidae Smitt, 1866 

 LiCHENOPORA Def ranee, 1823 



LicHENOPOEA VERRUCARIA (Fabricius), 1780. PL 1, fig. 8. 

 (Osburn, 1912, p. 219, synonymy and records; 1912a, p. 276, 

 otf Cape Sable; Whiteaves, 1901, p. 113, for Canadian rec- 

 ords.) Common on stony shores and bottoms, particularly 

 in shallow water, most frequently attached to algae. Noted at 

 nine shore stations and twenty-seven dredging stations. A 

 very common northern species, in the Arctic Ocean and on 

 both European and American shores. 



The colony is discoidal and small, less than i-inch across, 

 and is attached by a short central stalk or base. The ovicell 

 is an inflation of the central portion of the disc. The ooecio- 

 stome is a large trumpet-shaped expansion at the end of a 

 short tubule which is considerably larger than the ordinary 

 zooecial tubes. 



