Davenport. — Urnatella gracilis. 
PLATE I. 
ABBREVIATIONS. 
atr. Atrium. di. ba. — Basal disk. 
cic. Scar of fallen-off bud. di. sep. ‘Transverse septum. 
cl. flm. Flame cell. gm. Bud. 
cl. mi. Migratory cell. mu. Muscle fibre. 
cla. Cuticula. nl. Nucleus. 
Co Calyx. pli. ere. Circular folds. 
cx.rgn. Regenerating calyx. vt. gran. Yolk granules. 
Fig. 1. Regenerating stalk of Urnatella, viewed as an opaque object. x 96. 
« 2. Optical section of the same. X 96. 
« 3. Optical section of the distal end of a stalk of Urnatella which is probably 
about to regenerate, from living animal. x 410. 
« 4. Optical section of the proximal urn of the stalk of Urnatella. Showing 
thick cuticula and yolk granules. X 165. 
«5. Contents of proximal urn, obtained by crushing. Moving cilia were visible. 
Nuclei in some of the yolk granules. xX 820. 
“6. Stock of Urnatella viewed as opaque object. Three stems arising from 
the basal disk. Buds and regenerating terminal calyces. X 36. 
“7. Optical section of stalk of Urnatella. x 96. 
