DAVENPORT, — Urnatella gracilis. 
PLATE VI. 
ABBREVIATIONS. 
atr. Atrium. i. Inner layer of bud. 
cl. sec. Secreting cell. mu. Muscle fibre. 
em, Calyx. or. Mouth. 
di. sep, OF |... A spht. atr. Atrial sphincter. 
di. sp. f ete i st. Stomach, 
ex. Outer layer of bud. slo. Stolon. 
ga. Stomach ta. Tentacle. 
gm. Bud. 
Fig. 50. Surface view of stem stained in Czokor's cochineal and studied in clove oil, 
Showing the deeply stained protoplasm and crowded condition of 
nuclei indicating the position of an incipient bud. X 318. 
“ bl. Lateral bud drawn as transparent object after staining, showing stolon 
and secreting cells (cl. sec.). X 98. 
Figs. 52, 53, Two optical sections from different aspects of the same bud stained 
in Czokor's cochineal and studied in clove oil. Showing formation of 
alimentary tract. X 225. 
* 54-56. Three transverse sections across a young bud, showing the develop- 
ment of the alimentary tract. Fig. 54 nearest the tip; Fig 56 nearest 
the base. x 405. 
Fig. 57. Enlarged view of lateral bud showing stolon and secreting cells (cl, sec.). 
x 205. 
* 58. Stalk of young lateral (?) bud showing method of attachment to adult 
stalk. X 285. 
Figs. 59, 60. Two diagrams showing relation between the two methods of budding 
in Urnatella. The shaded cells indicate probable position of embry- 
onic tissue. 
