228 ROBERTSON [320] 



Family BICELLARIIDyE. 



BUGULA Oken. 



BUGULA MURRAY ANA Johnston. 



Bugula murrayana Hincks ('8o), pi. xiv, figs. 2-9. 

 Bugula murrayana Smitt ('67), pi. xvili, figs. 19-22. 



Habitat. — Abundant on the rocks. 



Local distribution. — Orca, Prince William Sound ; Juneau ; Hous- 

 ton-Stewart Channel and Virago Sound, Queen Charlotte Islands; 

 Puget Sound, dredged. 



Geographical distribution. — Scandinavian coasts ; Grotsund, Fin- 

 mark, 100 fms. ; Spitzbergen; Greenland; Labrador; Gulf of St. 

 Lawrence; New England; St. George Banks ; North Sea; Orkneys; 

 Shetland ; coast of Britain. 



Compared with specimens from the Northumberland coast, Eng- 

 land, the Orca form attains a very strong and vigorous growth. The 

 normal type prevails, but differs from the English form in the greater 

 opaqueness of the zoecial walls and in the size and greater abundance 

 of the spines. A variety also occurs which is extremely flustrine in 

 appearance. The segments are short and broad, often possessing 18 

 to 24 zoecia in alternate rows, and they spread out from the center 

 forming a fan-like growth. In all essential marks, size and number 

 of spines, position and size of avicularia and oecia, shape of zoecia, 

 etc., this variety agrees with the typical form. 



BUGULA PURPUROTINCTA Norman. 



(PI. XX, figs. 5. 6.) 



Bugula purpurotincta Hincks ('80), pi. xii, figs. 8-12. 

 Bugula pur purotincta Norman ('68). 



Habitat. — Very abundant upon Styela and upon the rocks. 



Local distribution. — Yakutat Bay ; Orca ; Pribilof Islands ; Puget 

 Sound; Tomales Bay, California. 



Foreign distribution. — Rather abundant on the northern coasts of 

 Britain ; Christiansund ; Bejan, 40-60 fms. ; Lofoten ; Bahusia ; Nor- 

 way, common, 30-130 fms. ; St. George Banks, 110-115 fms. 



This species grows in large bushy tufts often 7.5 cm. in height, and 

 the colonies are frequently united by a sort of cable formed by the 

 radical fibers. It is remarkable not only for its luxuriant growth but 

 also for the rich purple which most of it displays in the living as well 

 as in the dried condition. The color is particularly noticeable in that 



