PRADO xX. 
LAOTIRA CAMBRIA (p. 32). 
Fic. 1. Exumbrella view of a specimen in which the tendency to fission is strongly developed. 
Fig. 1a. Subumbrella surface of fig. 1. 
Fia. 1b. Side view of fig. 1. 
Fic. 2. A worn specimen in which fission has proceeded so far as to leave but one lobe, connecting 
what are otherwise two individuals. 
Figs. 3, 83a. Exumbrella view of a specimen in which fission has proceeded so far that there is appar- 
ently but a single lobe uniting the two parts. This is still better shown by the subum- 
brella surface, fig. 3a. 
GASTROBLASTA RAFFAELI (p. 39). 
Fias. 4-8. Scheme representing the successive fission of a supposed firstradiallarvalform. (After 
Lang. ) 
Fic. 9. A medusa in which the first stages of division are indicated. (After Lang.) 
Fic. 10. A different stage of division and binary fission in which two stomachs are developed and 
the fission is more advanced. (After Lang.) 
General meaning of the lettering: m, stomach in its inception; g, gonads; ¢, tentacles; 7, 
radial canals. 
The different ages of the gastral cavities, gonads, tentacles, and radial canals are shown by 
figures, viz: t, the oldest tentacle; ¢2, the second-oldest tentacle, etc.; m, the oldest stomach, m 2, 
the second-oldest stomach, etc. 
142 
