CEPHALODISCUS. 67 



Fir;. i>C). — Later bud, with secoml piiir of plume-axes appearing; side view, (x GO.) 



Fig. 57. — Later bud, with fourth pair of plume-axes appearing ; dorsal view. ( x 60.) 



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



side view, (x GO.) 

 Tig. 51). — A late or "ripe" bud of C hodgsoni, with a small bud of its own. (x 30.) As in 



figs. 5i-58, the parent stolon from which the bud was dissected off is not shown. 



PLATE 7. 



Fig. CO. — Young bud of Cephalodisrm {Idiothecin) niijrescens. ( X 30.) 



Fig. 61. — Later bud of 0. nii/rescens ; ventral view. (X 30.) 



Fig. 62.— Later bud ; ventral view. ( x 30.) 



Fig. 63. — Later bud ; ventral view. ( x 30.) 



Fig. 64. — Bud of same stage as that shown in fig. 63 ; side view. (X 30.) 



Fig. 65. — Similar bud in side view, but showing a very common disposition of the buccal shield. 



(x 30.) 

 Fig. 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. 07. 

 Fig. C7. — Later bud of C. iiigrescens. ( x 30.) Pinnules are appearing upon the plume-axes, and the 



bud has alreadj* developed two buds of its own. a, area of attachment to the pareat stolon ; 



b., buds ; h.s., buccal shield ; j;/., plumes ; v.m., visceral mass or " body." 

 Fig. 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. st., stolon ; other letters as in fig. 67. 

 Figs. 69-75. — Budding systems of Cephalodiscus nigrescens. In figs. (i9-73 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) hodgsoni. All magnified about 12-15 



diameters. In fig. 76, st., terminal portion of parent stolon. In fig. 83, «, area of attachment 



to i)arent stolon. For lettering of fig. 84 see text, p. 60. 



U 2 



\c; 



