320 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 37. 



EXPLANATION OF PLATES. 



(All figures are from photographs of preserved specimens.) 



Plate 30. 



Fig. 1. Sarsia princeps, specimen 14 ram. high. The jagged outlines of the radial 

 canals are visible, c. ap., apical canal. 



2. Sarsia viirabilis, specimen 10 mm. high, o, ocellus. 



3. Catablema vesicaria. A mature specimen 17 mm. in diameter. The bell is 



opened and its walls turned aside to show the manubrium and the vertical 

 sexual folds (go.) in the interradii. c. ra., radial canal; L, \\p. 



4. Catablema vesicaria, young specimen 9 mm. in diameter. The radial canals 



(r. ra.) already bear glandular diverticula, but the margin of the circular 

 canal (c. c.) is still smooth. 



5. Tiara pileata. Segment of bell-wall and margin. The radial canal (c. ra.) 



shows lateral diverticula, but the circular canal (c. c.) is smooth. 



Plate 31. 



Fig. 1. Melicertum campanula. One octant of bell margin of specimen 12 mm. in 

 diameter showing fully developed tentacles (Z"'), small tentacles (T-), and 

 rudimentary tentacles in the form of cirri (ci). go, gonad. 



2. Bougainvillea superciliaris . Side view of specimen 5.5 mm. in diameter. 



3. Lizzia octopunctata. Side view of a budding individual 3.5 mm. in diameter. 



4. Oral view of another individual of the same size. T. Ra., radial, T. ira., 



interradial tentacle-group. 



5. Lizzia octopunctata. Lip (L) showing nematocyst knobs (nem.). 



6. Catablema vesicaria. Segment of bell showing glandular diverticula on both 



radial canal (c. ra.) and circular canal (c. c), and the form of the basal tentacu- 

 lar bulbs, especially in the case of the radial tentacle (J". Ra.), which is 

 turned to one side, g, gelatinous substance of bell. 



7. Tiara pileata. Dissection of margin of bell to show lateral aspect of tentacular 



bulb. c. c, lumen of circular canal, g, gelatinous substance of bell. 



Plate 32. 



F^g 1. Melicertum campanula. One octant of margin of medium-sized individual 6 

 mm. in diameter showing tentacles in various stages of development. 

 go., gonad. 



2. Mginopsis laurentii. Side view of specimen 7 mm. in diameter, showing the 



conformation of the gastric pockets (g.p.) and their separation in the radii 

 of the peronise (Per.). T, tentacle. 



3. Aboral view of another individual of about the same size. Per., peronia. 



4. Oral view of gastric wall of individual 1.5 mm. in diameter. Lettering as in 



fig. 2, L, lip. 



5. Oral view of gastric wall of specimen 13 mm. in diameter, to show sexual folds 



(go.). Per., peronia; g, gelatinous substance; L, lip; T, tentacle. 



6. Otocyst, with otolith (otl.). X 200. 



