medcsj:. 61 



PLATK II. 



Fio. 1. — Sibogita borchgrevinki. Adult. Lateral view, x i'!. 



Fio. i.^Sibogita borchgrevinki. Lateral view of tiie stomacii. x 7. (W'lili of tiie mniirelia pitrtly cut 

 away.) g., genital openinj? in the wall of the stomach ; st. r., perradial ridtrc or hand alon),' the 

 stomach ; mesen., " mesentery " connectini,' the perradial caual {jicr. r.) with the stomach ; iii/cr. <•., 

 interradial canal with diverticula. 



Fic. ;i. — Sibogita borchgrevinki. Lateral view of a tentacle, x l.">. 



Fi(!. 4. — Sibogita borclujrevinki. Transverse section through the middle of the stomach, showing the 

 position of the gonads, x 20. 



Fk;. :>.— Sibogita borchgrevinki. Transverse section of the stomach of a specimen which has shed the 

 goniids. ee. c, cavities lined with ectoderm, x I'o. 



Fk;. (;. — Ptgchngena antnrctira. JIargin of the umbrella curled over, showing the distal portion of a 

 gonad {g.), the width of the velum (f.) and the arrangement of the tentacles. Oral view, x ::'. 



Fig. 7. — Ptgchogena antarclica. Uasal bulbs of the tentacles and the cordyli (c). Aboral view, x V>. 



Fk;. 8. — Ptgchogena antarctica. The basal bulb of a tentacle. Lateral view, x 15. 



Fig. 0. — Ptgchngena antarctica. A cordylus. x 80. 



PLATE III. 



Fn;. 1. — Eleiitheria hntlgsoni. Lateral view of the medusa, x 20. 



Fk;. 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 (oc). x 20. 



Fir,. 3. — EUutheriu hodgsoni. Oral view of the umbrella showing the mouth (w.), the gonads {g.), covered 

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



Fir,. 4. — Eleutheria hodgsoni. A tentacle showing the arrangement of the clusters of nematocysts when 

 the upper branch is contracted. 



Fir,. .'). — Pantachogon scotti. Lateral view of the medusa, x 13. 



Fio. C. — Pantachogon srottl. Diagram showing the position of the gonads upon the radial canals. 

 Oral view. 



PLATE IV. 



Fir,. 1. — KoelUkeria mtiasi. An early stage. Lateral view, x ao. 



Fk:. 2. — KoelUkeria, maasi. Lateral view of the adult, x H. 



Yin. 3. — Ko'ellikeri'i maasi. Portion of the margin of the umbrella, showing the perradial and interradial 

 groups of tcntiicles of an adult. Oral view, x 2i». per., perradial ; v., velum ; re, circular canal ; 

 b., compound basal bulb. 



Fio. L — KoelUkeria mansi. Transverse section of a radial canal, showing the ectoderm cells and groove 

 in the wall of the sub-umbrella, x 2;i(t. 



Vic. .'». — KoelUkeria matisi. Transveree section through the wall of the stomach, and showing a 

 longitudinal section of a gastric papilla (p.), and the ovary. X 2;30. 



Fio. fi. — Margelopsis australis. Lateral view of the Medusa. X 55. 



Fio. 7. — Margelopsis australis. Ond view of a basal bidb, showing the position of the two tentacles. 

 X 200. 



