DR. E. B. WILSON ON THE DEVELOPMENT OF RENILLA. 
815 
Fig. 178h Bud in profile view. X 90. 
Fig. 17 8b Bud from above. X 90. 
Fig. 179. Bight lateral view of part of a somewhat older polyp. X 45. 
Fig. 180. Dorsal view of last. X45. 
Fig. 181. Dorsal view of polyp with recently developed exhalent zooid. X30. 
Fig. 182. Dorso-lateral view of polyp with two pairs of buds. X30. 
Fig. 183. Lateral view of polyp with third pair of buds just appearing. X 40. 
Fig. 183°. Dorsal view of peduncle partly contracted to show bands of circular 
muscles. 
Fig. 183 s . Upper view of bud y> 3 . 
Fig. 183b Same bud in lateral optical section. 
Fig. 184. Ventral view of part of polyp with three pairs of buds. X 40. 
Fig. 184b Oral view of p l . 
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. X 60. 
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. X 30. 
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 (fl-)- 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. X 50. 
5 m 2 
