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CEPHALODISCUS. 67 
56.—Later bud, with second pair of plume-axes appearing ; side view. (Xx 60.) 
57.—Later bud, with fourth pair of plume-axes appearing ; dorsal view. (x 60.) 
58.—Bud of same stage of development as the last, but in a state of considerable extension ; 
side view. (x 60.) 
59.—A late or “ripe” bud of C. hodgsoni, with a small bud of its own. (x 30.) As in 
figs. 54-58, the parent stolon from which the bud was dissected off is not shown. 
PLATE 7. 
60.—Young bud of Cephalodiscus (Idiothecia) nigrescens. (x 30.) 
61.—Later bud of C. niyrescens ; ventral view. (x 80.) 
62.—Later bud; ventral view. (x 80.) 
63.—Later bud ; ventral view. (x 380.) 
64.—Bud of same stage as that shown in fig. 63; side view. (X 30.) 
65.—Similar bud in side view, but showing a very common disposition of the buccal shield. 
(x 80.) 
66.—Later bud of C. nigrescens, dorsal view, at a stage when the fifth pair of plumes are just 
appearing. (x 30.) Letters as in fig. 67. 
67.—Later bud of C. nigrescens. (x 30.) Pinnules are appearing upon the plume-axes, and the 
bud has already developed two buds of its own. 4a, area of attachment to the parent stolon; 
b., buds; b.s., buccal shield ; pl., plumes; v.m., visceral mass or “ body.” 
68.—Late bud of C. nigrescens, almost ripe. (x 30.) The axes of the plumes are now thickened, 
and the visceral mass projects in such a way that the stolon is no longer terminal. This stage is 
rare. The specimen figured had no buds of its own.  s¢., stolon; other letters as in fig. 67. 
Figs. 69-75.—Budding systems of Cephalodiscus nigrescens. In figs. 69-73 the distal end of the 
parental stolon is shown from the side, the cut surface being uppermost in the figure; figs. 74 
and 75 show the end view of the parental stolon. Only the smallest buds are shown entire , 
in other cases the bases of the stalks alone are shown. All magnified about 15 diameters. For 
explanation of letters of fig. 73 see text, p. 48. 
Fies. 76-84.—Budding systems of Cephalodiscus (Demiothecia) hodgsoni. All magnified about 12-15 
diameters. In fig. 76, s¢., terminal portion of parent stolon. In fig. 83, a, area of attachment 
to parent stolon. For lettering of fig. 84 see text, p. 60. 
U 2 
