MEDUSAE. 



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PLATE II. 



. Siboyitii . bnri-lujri'v inl.i. Adult. Lateral view, x 2L 



. Sibogiln borrhgrevinki. Lateral view of the stomach, x 7. (Wall of the umbrella partly cut 

 away.) g., genital opening in the wall of the stomach; at. >:, pernidial ridge or band along the 

 stomach ; nifsen., "mesentery" connecting the pemuliul canal (PIT. <:) with tin: sinmach ; i/i/rr. c., 

 interradial canal with diverticula. 



. Sibogita lorchgrcviiiki. Lateral view of a tentacle, x 1">. 



. Sihor/ita borc/i'/rrriii/,-/. Transverse section through the middle of the stomach, showing the 

 position of the gonads. x 2<i. 



. Silifii/itti lorchgreviriki. Transverse section of the stomach of a specimen wliich has >]nd the 

 gonads. cc. c., cavities lined with ectoderm, x -'<>. 



. Phji'liniii'iiii iniliirrlii-ii. Margin of the umbrella curled over, showing the dist;il portion of u 

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



. Ptychogcna antarclica. Basal bulbs of the tentacles and the cordyli (P.). Aboral view, x !">. 

 . Ptychofjcna antarctita. The basal bulb of a tentacle. Lateral view, x 15. 

 . Ptychogena antarctica. A cordylus. x 80. 



PLATE III. 



! 



, Elei/theria hodgsoni. Lateral view of the medusa, x 20. 



. Eleutlieria ho/ff/soni. Aboral view of the umbrella, showing the base of the stomach (/.), radial 

 canals (r.~), the bases of the tentacles (/.), and ocelli (oc.). X 20. 



. Eleufheriii Im/li/soiii. 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. 



. Ekuthcria hoiljxmii. A tentacle showing the arrangement of the clusters of nematocysts when 

 the upper branch is contracted. 



. Pitntftchogon scotti. Lateral view of the medusa. X !:">. 



. Pantachogon scotti. Diagram showing the position of the gonads upon the radial canaN. 

 Oral view. 



PLATE IV. 



. Koellikeria maasi. An early stage. Lateral view, x :;n. 

 . Koellikeria marisi. Lateral view of the adult. X 0. 



. Koellikrriit maasi. Portion of the margin of the umbrella, showing the perradial and interradial 

 groups of tentacles of an adult. Oral view, x 2n. />er., perradial ; y., velum ; cc., circular canal ; 

 b., compound basal bulb. 



. Knrllikrriit niiiiixi. Transverse section of a radial canal, showing the cctodi rm << 'Us and groove 

 in the wall of the sub-umbrella, x 2:!n. 



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

 longitudinal section of a gastric papilla (}>.}, and the ovary. X 2:!n. 



aitslnilis. Tjateral view of the Medusa, x ">">. 



. Miirt/rl'i/ixix iti/stnili*. Oral view of a basal bulb, showing the position of the t\vo tentacles. 

 X 200. 



^H 2 D -2 



