PLATE XIII. 
Fig. 70.—S. ciliata. Portion of zowcial branch enlarged to show shape 
and arrangement of the zowcia (z@.), the curved marginal spines (c. sp.), 
and the minute avicularia. X 50, 
Pig. 71.—S. ciliata. A few zowcia enlarged to show pedunculate owcia 
(oe.). X 50. 
Pig. 72.—Stirparia occidentalis sp. nov. Habit sketch, natural size. 
Pig. 73.—S. occidentalis. Upper portion of the stalk and a few,of the 
lower zo@cia, showing a specialization of the segments (seg.) of the stalk, 
their articulation (art.), and the sudden transition into zowcia where the 
zoecial tufts begin (fst. z@.). XX 50. 
Fig. 74.—S. occidentalis. Portion of a branch to show character of 
zoecia (z@.), of avicularia (av.), spines (sp.), and omecia (0e.). XX 50. 
Fig. 75.—Stirparia californica sp. nov. Habit sketch, natural size. 
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