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MEDUS. 61 
PLATE II. 
1.—Sibogita borchgrevinki. Adult. Lateral view. x 2h. 
2.—Stbogita borchgrevinki, Lateral view of the stomach. x 7. (Wall of the umbrella partly cut 
away.) g., genital opening in the wall of the stomach; st. r., perradial ridge or band along the 
stomach ; mesen., “‘ mesentery ’? connecting the perradial canal (per. c.) with the stomach ; mer. c., 
interradial canal with diverticula. 
3.—Sibogita borchgrevinki. Lateral view of a tentacle. x 15. 
4.—Sibogita borchgrevinki. Transverse section through the middle of the stomach, showing the 
position of the gonads. x 20. 
5.—Sibogita borchgrevinki. Transverse section of the stomach of a specimen which has shed the 
gonads. ec. ¢., cavities lined with ectoderm. x 20. 
6.—Ptychogena antarctica. Margin of the umbrella curled over, showing the distal portion of a 
gonad (g.), the width of the velum (v.) and the arrangement of the tentacles. Oral view. x 2. 
7.—Ptychogena antarctica. Basal bulbs of the tentacles and the cordyli (¢.). Aboral view. x 15. 
8.—Ptychogena antarctica. The basal bulb of a tentacle. Lateral view. x 15. 
9.—Ptychogena antarctica. A cordylus. x 80. 
PLATE III. 
1.—Eleutheria hodgsont. Lateral view of the medusa. x 20. 
2.—Lleutheria hodgsont. Aboral view of the umbrella, showing the base of the stomach (sé.), radial 
canals (r.), the bases of the tentacles (¢.), and ocelli (oc.). x 20. 
3.—Eleutheria hodgsoni. Oral view of the umbrella showing the mouth (m.), the gonads (y.), covered 
over by the velum (v.), and the bases of the tentacles covered with nematocysts (”.). x 20. 
4,—Eleutheria hodgsont. A tentacle showing the arrangement of the clusters of nematocysts when 
the upper branch is contracted. 
5.—Pantachogon scotti. Lateral view of the medusa. x 13. 
6.—Pantachogon scotti. Diagram showing the position of the gonads upon the radial canals. 
Oral view. 
PLATE IV. 
1.—Koellikeria maasi. An early stage. Lateral view. X 30. 
29.—Koellikeria maasi. Lateral view of the adult. x 6. 
3.—Koellikeria maasi. Portion of the margin of the umbrella, showing the perradial and interradial 
groups of tentacles of an adult. Oral view. x 20. per., perradial; v., velum ; cc., circular canal ; 
é., compound basal bulb. 
4.—Koellikeria maasi. Transverse section of a radial canal, showing the ectoderm cells and groove 
in the wall of the sub-umbrella. x 230. 
5.—Koellikeria maast. Transverse section through the wall of the stomach, and showing a 
longitudinal section of a gastric papilla (y.), and the ovary. x 230. 
6.—Margelopsis australis. Lateral view of the Medusa. x 55. 
7.—Margelopsis australis, Oral view of a basal bulb, showing the position of the two tentacles. 
x 200. 
2D 2 
