CBPHALODISCUS. 67 



FIG. 56. Later bud, with second pair of plume-axes appearing ; side view. ( X 60.) 



FIG. 57. Later bud, with fourth pair of plume-axes appearing; dorsal vie\T. (x 60.) 



FIG. 58. Bud of same stage of development as the last, but in a state of considerable extension ; 



side view, (x CO.) 

 FIG. 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. 



; 



FIG. CO. Young bud of Cephalodiscus (Idiothecia) nigrescens. (x 30.) 



FIG. 61. Later bud of C. niyrescens ; ventral view, (x 30.) 



FIG. 62. Later bud ; ventral view. ( x 30.) 



FIG. 63. Later bud ; ventral view, (x 30.) 



FIG. G4. Bud of same stage as that shown in fig. 03 ; side view. ( X 30.) 



FIG. Co. Similar bud in side view, but showing a very common disposition of the buccal shield. 



(X 30.) 

 FIG. CG. 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. G7. 

 FIG. G7. 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. a, area of attachment to the parent stolon ; 



1)., buds ; b.s., buccal shield ; pi., plumes ; v.m., visceral mass or " body." 

 FIG. C8. -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. st., stolon ; other letters as in fig. 67. 

 FIGS. G9-75. 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. 

 FIGS. 76-84. Budding systems of Cephalodiscus (Demiothecia) hodjsoni. All magnified about 12-15 



diameters. In fig. 70, st., terminal portion of parent stolon. In fig. 83, a, area of attachment 



to parent stolon. For lettering of fig. 84 see text, p. CO. 



TJ 2 



