28 Journal of Entomology and Zoology 
droids. In the last of November of the same year not a single 
larva, immature form or adult, was found although a very thor- 
ough search was made of the surface and interior of the polyps and 
dead stems. 
Figs. 1, 2 and 3 are drawn to the same scale, X350. In ¥\g. 6, 
a number of stages from the egg to the latest larval stage is 
shown, all drawn at the same scale. Stage /; probably moults upon 
entering the polyp; as judged from the cast skins, there is probably 
a moult between c and a, and d and c. As shown in Fig. 3, there 
are little knobs left just ahead of the limb buds. These knobs are 
the vestiges of the whip-like appendages of the earlier stage. 
According to Semper these two appendages degenerate com- 
pletely, Adlerz believes that some vestiges of these remain and in 
their place the second and third limbs of the adult are formed. 
Meinert believes that the second and third appendages of the larva 
entirely disappear and the palps and ovigers are new structures. I 
am sure from the examination of many embryos of /i. erectus that 
the larval second and third appendages disappear beyond recogni- 
tion and that the ovigers develop after the animal is almost an 
adult, but 1 am not sure that the little knob which may be seen in 
parasitic and later stages does not represent the ovigers. If this 
last be true, it would be very difficult to prove that it was an entirely 
new structure, because it grows out from the place where the third 
larval organ disappears. The chelifori of the larval stages are 
continued directly to the adult condition. Very little of the internal 
structure is shown from the surface of the earliest stages. The 
nervous system is not shown as a distinct area in earliest larval 
stages although it is well shown and well developed in the similar 
stages of other larvit. It may be that the probable lack of activity 
may not necessitate the sharp demarkation of the brain and ganglia. 
Later parasitic lar\al stages show well-marked ganglia for the 
larger appendages and smaller ones for the caudal and cephalic 
ends. At the caudal end there seems to be a gradual development 
of the ganglia with the development of the caudal end of the animal 
and in some free living forms there seem to be at least two pairs 
of ganglia beyond the thoracic or leg ganglia. At the cephalic end 
it is more difficult to make accurate observations. In parasitic 
