272 University of California Publications. [ ZooLocy 
This species resembles B. flabellata in some respects, and was 
previously so identified (’00), but it is characterized by a total 
lack of ocecia and is believed to be an undescribed species. A 
negative character is, to be sure, an unsound basis, in most 
cases, upon which to establish species, but there can be no doubt 
in this instance, that owcia are not developed. A well matured 
colony gives many branches in which the life cycle can be read. 
At the anterior edge of a branch the younger polypides are 
found in all stages of development. In the zoccia just posterior 
to these, full grown polypides appear and the genital products 
are abundant. In still older zowcia, a young embryo appears 
close to the anterior edge of the orifice of each zocecium, and 
the polypide in such a zocecium begins to degenerate. In older 
zocecia, nothing is left of the polypide but a brown body, while 
the embryos are well developed, almost ready to hatch (Pl. XI, 
fig. 55, emb.; b. b.) ; in still older zowcia, regenerating polypides 
(re. pd.) are found in zoccia containing no embryos and from 
which the larvae, presumably, have escaped. The lack of the 
ovicell and the development of the embryo entirely within the 
zocecium, are not the only characters which separate this form 
from B. flabellata. The shape of the avicularia, and the number 
and position of the spines are sufficient and constant specific 
differences. 
This species has been obtained mainly in Puget Sound. It is 
abundant on Channel Rocks at extreme low tide, and has been 
dredged at San Juan Island, Puget Sound. <A small quantity, 
dredged at ten fathoms, was obtained at Sitka, Alaska. 
21. Bugula curvirostrata, sp. nov. 
Pl. XI, figs. 56, 57, 58. 
Zoarium consisting of numerous strap-lke, dichotomously 
branched tufts, from 35 to 75 mm. in height (fig. 56); the 
branches much tangled, due to the binding fibres (6. f.) given 
oft from the different parts of the colony which unite adjacent 
branches or portions of a branch. Zoewcia multiserial, alternate, 
varying from one or two, to four or five, or even seven or eight 
rows (fig. 57); long, somewhat truncate above, narrow below, 
