14 ANATOMY OF ASTRANGIA. 
Fig. 17.—Inflated condition of the chambers, by which the mouth is hidden. 
a. Position of mouth. a’. Inflated chamber. d. Tentacle. Alternate tentacles are foreshortened 
and appear spherical or circular. 
Fig. 18.—Animal half contracted, seen from a latero-oral view. The tips of the tentacles (d) 
project beyond the inner rim of the contracted column. 
g. Basal chamber. h. Basal mesenteries. 
Figs. 19, 20.—Oral view showing folds of the column in contraction. 
a. Mouth. g. Basal region. h. Peripheral region. 
Fig. 21.—Profile view of the peristoma and mouth. 
a. Mouth. a’. Peristoma. The dotted lines end at two intermesenteric chambers. 
Fig. 22.—Mouth and tentacles in relative position to each other. 
Fig. 23.—Mouth and tentacles with inflated intermesenteric chambers. 
Fig. 24.—Junction of the columnar and basal regions. Animal retracted. Tentacles (d) simply 
indicated. 
a. Mouth. g. Point of junction of the columnar and basal region. 
Fig. 25.—Oral view of an expanded animal, showing the relation of the bases of the tentacles to 
the interseptal chambers. 
a. Mouth. a’. Peristoma. d. Tentacles. e. Bases of tentacles and junction with chambers. 
Fig. 26.—Enlarged view of a contracted animal with inflated peristoma. The tentacles are 
hidden between the wall of the oral prominence and the inner rim of the column. The tips of a few 
of these structures (tentacles) can be seen on the left-hand side in the ring-formed fossa. 
a. Mouth. a’. Peristoma. g. Chambers. h. Septum. 
Fig. 27.—A mesenteric filament (f) showing through the mouth opening. 
d. Tentacle. g. Column. h. Peripheral region. 
Fig. 28.—Peristoma and tentacles. a’. Peristoma. Two of the tentacles are bent to show their 
shape, while others appear in perspective. 
Fig. 29.—Contracted animal with tentacles removed or hidden by inflated: walls of the chambers. 
a. Mouth. 
Fig. 30.—A contracted cluster of coral animals, showing the fusion of the chambers in two indi- 
viduals in the two lower members. All contracted. 
a. Mouth. g. Columnar region. h. Peripheral chambers. 
Fig. 31.—A cluster of expanded animals. 
a. Mouth. d. Tentacles. g. Basal region. h. Coenosare and basal fusion of two animals. 
