236 — University of California Publications. | ZooLocy 
and Eucratea is somewhat arbitrary since they are more or less 
inerusting. In reality the forms treated comprise the first seven 
families of the Chilostomata as given by Hincks, and these with 
the exception of the two genera mentioned above are erect, flexi- 
ble and non-incrusting. Even these two genera send off erect 
free branches, and are thus partially non-incrusting. The 
bryozoa here identified comprise only a small part of the ma- 
terial on hand, the greater portion of which was collected at San 
Pedro and San Diego in 1901, 1902, and 1903 on dredging ex- 
peditions conducted by the Zoological Department of the Uni- 
versity of California; another portion was dredged in Puget 
Sound during the summers of 1903 and 1904 by the Department 
of Zoology of the University of Washington, and kindly placed 
at my disposal by Professor Trevor Kincaid. 
In the endeavor to make this work as useful as possible to 
the genera! student as well as to the expert, original figures are 
given of all the species mentioned. These include a habit sketch 
which is a photograph wherever possible, and one or more other 
figures giving details and variations. It is thought best even 
though a species is cosmopolitan in its range, and even though 
it has already been sufficiently well represented for diagnostic 
purposes, to refigure it here; and this for two reasons: first, 
bryozoan literature, consisting as it does, except in two or three 
instances, of detached papers scattered through scientifie jour- 
nals is not readily accessible to the general student. Second, 
the number of cosmopolitan species, or of species easily identi- 
fied, is surprisingly small, while the number new to science is 
correspondingly large; hence as far as illustration at least is 
concerned, it is desired to make this work as complete as pos- 
sible for the forms found on the Pacifie Coast. The diagnoses 
are somewhat lengthy descriptions, with references to figures 
wherever clearness seemed to demand it. Further, in order to 
assist in the identification of species, simple keys have been de- 
vised for the families, and where more than one genus or species: 
occur under a family, separate keys are given for each. The 
keys for species cover only those treated in this paper and are 
intended only for the bryozoa of this coast. Since Hincks’ (’80) 
