VoL, 2] Robertson.—Non-Incrusting Bryozoa. 271 
way from the top of each zocecium; those on the intermediate 
zocecia smaller than those on the margin; marginal avicularia 
of medium size, point of mandible bent abruptly downward. 
Oawcia small, globular, smooth, well elevated above the top of the 
zocecium, with a double line forming a band on the oral rim; 
opening wide. 
This species differs slightly from Hincks’ description of B. 
flabellata, in the number of spines, the English species appar- 
ently having but two on each side of the zowcium. It agrees, 
however, with the figure given by Busk in which he represents 
three spines on the outer side of the marginal zocecia. In other 
respects the English and American species seem to be identical. 
Bugula flabellata has been obtained in small quantity on the 
piles in San Diego Bay. 
20. Bugula pugeti sp. nov. 
PIX, figs. 53,54; Pl. Xl, fig: 55. 
Bugula flabellata, Robertson, 1900, p. 321. 
Zoarium composed of numerous small somewhat spiral tufts 
from 10 to 25 mm. in height (fig. 53). Zowcia multiserial, 
each branch consisting of from four to seven rows (fig. 
54); long, narrowed slightly below; aperture occupying two- 
thirds or more of the front; three spines on the marginal zocecia, 
two on the outer side (ou. sp.), one on the inner (in sp.) ; inter- 
mediate zocecia with two spines only; the middle of the anterior 
edge of each zocecium occupied by a round knob or process 
whose significance is unknown (k.). Avicularia (av.) found 
only on the marginal zoweia, large, beak somewhat curved, sit- 
uated half way from the top, or just below the middle of the 
zocecium. Oacia none. Embryos (Pl. XI, fig. 55 emb.) develop- 
ing in the anterior part of the zocecium, and no additional ocecium 
being formed. Embryos abundant in the older parts of the 
colony, and those zocecia possessing well developed embryos con- 
taining no polypide. Rootlets extending from the lower zocecia 
of the colony, forming a cluster at its base and attaching it to 
shells, rocks, or sea weed. 
