342 DISCOVERY REPORTS 



The specimen shown (1935) in Okada's fig. 1 d with a float-length of about 5-25 mm. still shows only 

 the first three of the secondary gastrozooids of the main zone. Until January 1958, 1 was unable to add 

 any further evidence on this point because my specimens were too far developed, but since receiving 

 Miss Dodge's material I have been able to clear up the sequence of the appearance and identity of 

 these early buds. 



Early Larvae (PI. VII, Text-figs. 23-4) 

 Huxley (1859) was the first to figure the early larva of Physalia. He gave a figure of an individual 

 taken probably in the spring of 1847 in the South Atlantic. It measures one-tenth of an inch (2-5 mm.), 

 though he recorded it as one-fifth of an inch, in length. There is no sign in this figured specimen of 

 secondary buds. Haeckel followed with one of his idealized figures (1888) and then Alexander Agassiz 

 and A. G. Mayer (1902) gave two more interesting and convincing ones. Their specimens measured 

 2 mm. and 4 mm. in length and were found by 'Albatross' at the Fiji Islands, 1897-8, and on 

 5 and 7 September, and 4 November, 1899 and 22 January 1900, among the Paumotus and Society 

 Islands. The smaller specimen was reported as having two very small evaginated protuberances from 

 the ventral floor of the float. 



P2 



Text-fig. 22. Physalia physalis. Young left-handed specimen from Arrecife seen from above (overall length 22 mm.). Italic 

 arabic numerals below show order of appearance of the first five gastrozooids. Six cormidia are shown in the main zone 

 and three in the oral. 



The first of the secondary buds to appear in Physalia are those of the gastrozooids of group number 

 one of cormidia III and VII (or VI if only six cormidia are present) (PI. VII, fig. 3, Text-figs. 23 and 

 24). These are closely followed by the bud for the ampulla of the main tentacle of cormidium II. Its 

 gastrozooid follows a little later from the same very short peduncle. Even at much later stages the 

 first two precocious gastrozooids (III and VII) are very noticeable and rather isolated (PI. XIII, 

 fig. 5). In Okada's (1932, 1935) notation they are P 1 and P 2 respectively, and the ampulla is ph 

 ('phyllomeride'). 



