Davenport. — Urnatclla gracilis. 



PLATK VI. 



ABBRKVIATIONS. 



ntr. Atrium. 



cl.scr. Sucrotiiig cell. 



ex. Calyx. 



dl. sep. or I 



,. ( Dissepiment. 



(U. sp. ) 



r.r. Outer layer of bud. 



ffti. Stomach 



f/m. Hud. 



i. Inner layer of bud. 



JH«. Muscle librc. 



or. Mouth. 



split, atr. Atrial sphincter. 



St. . Stomach. 



slo. Stolon. 



ta. Tentacle. 



Fig. 50. Surface view of stem stained in t'zokor's cochineal and studied in clove oil, 

 Sliowint; the deeply stained protoplasm and crowded condition of 

 nuclei indicating the position of an incipient hud. X ol8. 

 " 51. Lateral bud drawn as transparent object after staining, showing stolon 

 and secreting cells (r/. scr.). X 98. 



Figs. 62, 63. Two optical sections from ditlerent aspects of the same bud stained 

 in Czokor's cochineal and studied in clove oil. Showing formation of 

 alimentary tract. X 22o. 

 " 54-66. Three transverse sections across a young bud, showing the develop- 

 ment of the alimentary tract. Fig. 64 nearest the tip ; Fig 66 nearest 

 the base. X 405. 



Fig. 57. Enlarged view of lateral bud showing stolon and secreting cells (c/. sec). 

 X 206. 

 " 58. Stalk of young lateral (?) bud showing method of attachment to adult 

 stalk. X 286. 



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. 



