PLATE X. 
Fig. 48.—Bugula murrayana Johnston. Portion of a branch enlarged 
showing zoecia (z@.) with margins of aperture armed with variable number 
of spines (sp.); avicularium (av.) or spine (sp.) at base of aperture. Mar- 
ginal avicularia lacking on this specimen. X 30. 
Fig. 49.—B. californica sp. nov. Portion of a branch enlarged to show 
spines terminating the upper margins of the aperture (sp.),long outer spine 
(ou. sp.), and position of avicularia (av.). 50. 
Fig. 50.—B. pacifica sp. nov. Portion of a branch enlarged to show 
zoecia (z@.), spines (sp. and sp.’), and the shallow owcia (0e.); also the 
embryo (emb.) in the upper part of the zoecium. X 50. 
Fig. 51—Bugula flabellata Thompson. Habit sketch, natural size. 
Fig. 52.—Bugula flabellata. Portion of a colony enlarged to show ar- 
rangement and branching of zoccia, the spines (sp.), avicularia (av.), and 
owcia (0e.). X 30. 
Fig. 53.—Bugula pugeti sp. nov. Habit sketch. 
Fig. 54.—B. pugeti. Zoecia with lorg aperture (ap.), marginal avicu- 
laria (av.), the three spines on the marginal zowcia (out. sp.), and the 
process on the distal margin (k.). X 30. 
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