PLATE VIII 



Fig. i. A young left-handed Physalia from Arrecife, specimen Juv. 12, 

 float-length 2-9 cm., showing crest, gas-gland, basal internode, 

 main tentacle (cormidium II) and individual groups of cormi- 

 dium I. x 19. 



Fig. 2. A young right-handed Physalia from Arrecife, specimen Juv. 8, 

 float-length 3 cm., viewed from above, showing early stages of 

 crest-development, oral zone and main zone of six cormidia 

 separated by the basal internode. The limits of cormidium III can 

 be seen extending from the oral side of the main tentacle (II) to the 

 large gastrozooid of its group 1 on the other side, x 2. 



Fig. 3. A left-handed young specimen from Arrecife, Juv. 5, float- 

 length 19 mm., viewed from the leeward (under) side. There are 

 six cormidia in the main zone and five in the oral, x 4-7. 



Fig. 4. The same from the windward (upper) side. At this stage some 

 main zone cormidia bear a larger windward gastrozooid (group 1) 

 and a smaller leeward one. In the oral zone two gastrozooids of 

 groups 1 and 2 predominate (cf. Text-fig. 22). x 4-7. 



Fig. 5. A young right-handed Physalia, K2, float-length 12 mm., gas- 

 gland diameter 25 mm., taken by Miss Dodge near Miami, 

 Florida, viewed from the leeward (under) side. There are seven 

 cormidia in the main zone, x 5. (For details see Text-fig. 16.) 



Fig. 6. The same specimen from the windward (upper) side. Cormi- 

 dium VI is partly hidden by VII (cf. Text-fig. 19). 



