284 University of California Publications. [ ZooLocy 
divide into a number of secondary stalks (b7.) each surmounted 
by its zocecial tuft and sending down rootlets which attach them- 
selves to the base. The colonies of S. californica grow in isolated 
groups, thus differing from S. ciliata and SN. occidentalis, which 
form tangled masses of stems springing from many interwoven 
rootlets. 
S. ciliata and S. occidentalis are shore forms, being found 
between tides growing on sea weed, other bryozoa, ete. S. cali- 
fornica, on the other hand, is a deep water form, being dredged 
at a depth of 125 fathoms in the submerged valley off La Jolla. 
Corynoporella Hincks. 
Corynoporella Hincks, 1888. 
Zoarium forming delicate white tufts, consisting of zocecia 
disposed in a single series, and facing one way; dichotomously 
branched. Zoacia more or less clavate, each originating from the 
dorsal surface of the one beneath it, immediately below the sum- 
mit; elongated, attenuated, tubular; aperture occupying a half 
or less of the front surface. Avicularia articulated, attached to 
the side of the aperture. Oacia globose. 
29. Corynoporella spinosa sp. nov. 
Pl. XIV, figs. 81, 82, 83. 
Zoarium erect, much branched, each internode consisting of 
a single zoccium (fig. 81); branches (fig. 82, br.) arising on 
the dorsal surface near the summit, singly or in pairs. Zowcia 
sub-clavate. narrowed below, widened above, the distal margin 
truneate or only shghtly rounded; aperture membranous, occu- 
pying a third or more often a half of the front surface; sur- 
rounded by a thin raised margin on the distal edge of which 
are three minute spines or denticles, two lateral and one median, 
the latter being frequently absent. Avicularia (av.) large, 
rounded, pedunculated, situated half way between the summit 
and the base on the side of the aperture; mandible flat and 
rather broad and short, terminating in a point below the ab- 
ruptly bent beak. Owcia (fig. 83, oe.) globose, prominent, as. 
