MEDUSJ-:. 61 



PLATE II. 



Fir;. 1. Sibogita borchgrevinki. Adult. Lateral view. X 2|. 



Frc. 2. Siboyif/i, horchgrevinki. Lateral view of the stomach, x 7. (Wall of the umbrella partly cut 

 away.) ff., genital opening in the wall of the stomach ; st, r., perradial ridge or baud along the 

 stomach ; rnesen., " mesentery " connecting the perradial canal (per. c.) with the stomach ; inter, c., 

 interradial canal with diverticula. 



FK;. ;!. Sibogita borchgrevinki. Lateral view of a tentacle, x 15. 



FIG. 4. Sibogita borchgrevinki. Transverse section through the middle of the stomach, showing the 

 position of the gonads. x 20. 



Fir;. 5. Sibof/ita borchgrevinki. Transverse section of the stomach of a specimen which has shed the 

 gonads. ec. c., cavities lined with ectoderm, x 20. 



FIG. 6. Ptychogena anhirctica. Margin of the umbrella curled over, showing the distal portion of a 

 gonad (//.), the width of the velum (v.) and the arrangement of the tentacles. Oral view, x 2. 



FIG. 7. Ptgchogena antarctica. Basal bulbs of the tentacles and the cordyli (c.). Aboral view, x 15. 

 FIG. 8. Ptychogena antarctica. The basal bulb of a tentacle. Lateral view, x 15. 

 FIG. 9. Ptychngena antarrtica. A cordylus. X 80. 



PLATE III. 



FIG. 1. Eleutheria hodgsoni. Lateral view of the medusa, x 20. 



FIG. 2. Eleutheria hodgsoni. Aboral view of the umbrella., showing the base of the stomach (s/.), radial 

 canals (r.), the bases of the tentacles (<.), and ocelli (pc.). x 20. 



FIG. 3. Eleutheria hodgsoni. Oral view of the umbrella showing the mouth (?.), the gonads (</.), covered 

 over by the velum (v .), and the bases of the tentacles covered with nematocysts (.). x 20. 



FIG. 4. Eleutheria hodgsoni. A tentacle showing the arrangement of the clusters of nematocysts when 

 the upper branch is contracted. 



FIG. 5. Pantachogon scotti. Lateral view of the medusa, x 13. 



FIG. 6. Pantachogon scotti. Diagram showing the position of the gonads upon the radial canals. 

 Oral view. 



PLATE IV. 



FIG. 1. Koellikeria maasi. An early stage. Lateral view, x 30. 

 FIG. 2. Koellikeria maasi. Lateral view of the adult. X (!. 



FIG. 3. Koellikerin, 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 ; 

 b., compound basal bulb. 



FIG. 4. Koellikeria maasi. Transverse section of a radial canal, showing the ectoderm cells and groove 

 in the wall of the sub-umbrella, x 230. 



FIG. 5. Koellikeria maasi. Transverse section through the wall of the stomach, and showing a 

 longitudinal section of a gastric papilla (p.), and the ovary. X 230. 



FIG. (I. Hargelopsis australis. Lateral view of the Medusa, x 55. 



FIG. 7. Margelopsis aiisfntlix. Oral view of a basal bulb, showing the position of the two tentacles. 

 X 2oo. 



2 D 2 



