ANATOMY OF ASTRANGIA. 15 
PLATE III. 
EXTERNAL FORM. 
Fig. 1.—Lateral view of the upper part of an animal showing expanded tentacles. 
a. Mouth. b. Constricted region of the digestive tract. c. Stomach. d. Tentacles. 1. Junc- 
tion of the tentacles and radial chambers. 
Fig. 2—Expanded animal from oral side. 
a. Mouth. d. Tentacle (?). e. Communication between the cavity of a tentacle and a radial 
chamber. 
Fig. 3.—Two tentacles. e. Junction of the base of the tentacle with the body wall and chamber. 
Fig. 4.—Oral view, similar to that shown in Fig. 2, with same lettering. 
Fig. 5.—Lateral view of the column, upper extremity. Tentacles (d) drawn together about the 
mouth. 
Fig. 6.—Lateral view of an animal with partially extended tentacles. 
a. Mouth. b. Constriction of stomach. d. Tentacles. 
Fig. 7—Column. 
a. Mouth. b. Oral constriction. c. Cavity. g,h. Basal region. 
Fig. 8.—Attitude assumed by animal in which the tentacles (d) are turned in towards the mouth 
and a constriction separates columnar and basal regions. 
Fig. 9.—Expanded animal with contracted tentacles (d). 
b. Constriction. c. Cavity. g, h. Basal region. 
Fig. 10.—Column of an expanded animal from one side. 
a. Mouth. d. Tentacles. 
Fig. 11.—Partially contracted animal in which the tentacles are represented as being withdrawn 
into the cylinder of the column. 
f. Mesenteric filament. g, h. Basal region. i. Chamber. 
Fig. 12.—The oral prominence (peristoma) from one side. 
a. Mouth. b. Oral constriction. c. Stomach or external wall. From the letters a and b I 
should suppose ¢ was used to designate the stomach. In Fig. 14, however, it may be simply the 
external wall of the column. 
Fig. 18.—Expanded animal with tentacles (d) half protruded, but with peristoma retracted. 
a. Mouth. b. Oral constriction. c. Cavity. f Mesenteric filament. g, h. Basal region of 
animal. 
Fig. 14.—The upper part of the column of a fully expanded animal. 
a. Mouth. c. Body wall of the column. d. Tentacle. 
