12 ANATOMY OF ASTRANGIA, 
Fig. 16.—Attitude assumed when the oral prominence and tentacles are drawn into the columnar 
region of the animal. 
d. Tentacles half retracted. g. Point of division between the base of the columnar region of the 
animal and its basal region. h. Basal chamber of the flat region of the body. 12 diameters. 
Fig. 17—Same as Fig. 16, with the columnar region partially retracted and the column con- 
stricted midway in height. 
a. Mouth. Other letters as in Fig. 16. 
Fig. 18.—Diagram showing the relative positions of large and small tentacles and the mouth. 
Compare with Fig. 5 (lettering a, b,c) for relation of the tentacles to the calcareous septa. The 
oblong central opening represents the mouth. 
a. Eight large tentacles (first formed?). b. A second series. c. A third series. It is difficult 
to determine what was intended to be represented by the above diagram. The same lettering in Fig. 5 
represents chambers between calcareous deposits. As such chambers correspond in position with that 
of the tentacles, it is supposed that the peripheral ring in Fig. 18 represents the relative positions of 
these bodies. 
