THE BRYOZOA 32 I 



which was obtained at the Point, in the more exposed situation. It is 

 located in part in the tissue lining the zoecia, and in part in the de- 

 generated polj'pides. These constitute the so-called ' brown bodies ' 

 of other Bryozoa which in this species are purple. A small number 

 of specimens was picked up at the Pribilof Islands, Alaska, by Pro- 

 fessor Kincaid, of the Washington University. These have been pre- 

 served in the dried state and the color is very distinct. Material ob- 

 tained at other points near Yakutat, and some of the same, or of a 

 closely allied species, from Puget Sound and California, do not show 

 this color, but are rather of a yellowish tinge. 



In some respects this species varies from the type described by Nor- 

 man and Hincks. Thus, these authors report but one spine for 

 Bugula purpurotzncta^ and a denticle in front of it. The Yakutat 

 form possesses three spines and the number seems to be invariable. 

 As represented in PI. XX, fig. 5, a long spine {sp.^ is present at 

 the summit of the zoecium. This probably corresponds to the one 

 reported for this species. But at the upper extremity of the aper- 

 ture, structures occur on each side, which may properly be called 

 spines {sp.' sp."), one of which may perhaps correspond to the den- 

 ticle of the English form. The long spine (sp.) at the top of the 

 zoecium frequently measures 15 mm., while the other two are smaller, 

 measuring on an average about 5 mm. The aperture {ap.) is long, 

 and extends almost to the bottom of the zoecium. The avicularia (av. ) 

 are of unusually large size, and are always placed just below the aper- 

 ture. The oecia (ce.) are remarkably small. They do not rise more 

 than 3 or 4 mm. above the zoecium, while in many cases the embryo 

 measures 10 mm. in length. Fig. 5 represents two embryos {emb.')^ 

 which lie for the most part in the upper portion of the zoecia. In his 

 description of B. purpurotincta^ Mr. Hincks speaks of the extreme 

 shallowness of the oecia, and says that they only partially cover the 

 embryo in its later stages. 



Whether these deviations from the type can be considered as mere 

 individual variations or whether they have specific value is still an 

 open question. Provisionally, at least, this form is placed in the 

 present species. If upon further study it should prove to be new, I 

 would suggest the name Bugula pacifica^ since it seems to be charac- 

 teristic of this coast. 



BUGULA FLABELLATA J. V. Thompson. 



Bugula flabellata Hincks (80), pi. xi, figs. 1-3. 



Bugula avicularia forma 2, B. fiabellata Smitt ('67), pi. xvill, fig. 11. 



Habitat. — On a limpet shell. 



