DR. E. B. WILSON ON THE DEVELOPMENT OF RENILLA. 815 
Fig. 178’. Bud in profile view. x 90. 
Fig. 178°. Bud from above. x 90. 
Fig. 179. Right lateral view of part of a somewhat alder polyp. x45. 
Fig. 180. Dorsal view of last. x 45. 
Fig. 181. Dorsal view of polyp with recently developed exhalent zooid. x 30. 
Fig. 182. Dorso-lateral view of polyp with two pairs of buds. x 30. 
Fig. 183. Lateral view of polyp with third pair of buds just appearing. X40. 
Fig. 183%. Dorsal view of peduncle partly contracted to show bands of circular 
muscles. 
Fig. 183’. Upper view of bud p’. 
Fig. 183°. Same bud in lateral optical section. 
Fig. 184. Ventral view of part of polyp with three pairs of buds. x 40. 
Fig. 184%. Oral view of p!. 
PLATE 66. 
Fig. 185. Dorsal view of young colony having five pairs of buds and three zooids. 
x 40. 
Fig. 186. Dorsal view of part of young colony with seven pairs of lateral buds and 
three pairs of zooids. X60. 
Fig. 187. Dorsal view of fully expanded colony with twelve pairs of lateral buds and 
numerous zooids. X 30. 
Fig. 188. Dorsal view of colony in a state of contraction with thirteen pairs of lateral 
buds. X30, 
Fig. 189. Dorsal view of left half of the disc of a young colony. The zooids have 
multiplied to form groups represented by small circles. x 15. 
PLATE 67. 
Figs. 190 to 193. Series illustrating development of calyx-teeth. From a mature 
. colony. X 20. 
Figs. 194 to 203. Series illustrating the multiplication of a single primary zooid ( p.) 
to a group of eighteen. x 80. 
Fig. 204. Ventral view in optical section of the bases of the first two pairs of lateral 
buds to show the partition between them and its free-edge ( jl.) below. 
x 50. 
Fig. 205. Ventral view in optical section of an older colony to show further develop- 
ment of the lateral folds (/l.). x 50. 
Fig. 206. Similar view of a still older specimen in which the two folds have met to 
form a single fold beneath the peduncular septum, X 50. 
Fig. 207. Similar view of older specimen in which the closure of the ventral canal is 
well advanced X50. 
OPM 2 
