Pomona College, Claremont, California 27 
.02 mm. A. erectus are .03 mm. in diameter, 4. californicus .035, 
A. spinosissima .0425, A. bi-unguiculata var. calif. .0575, T. inter- 
medium .06, A. tuberculata .0675, L. marginatus .065, Palene 
californiensis .175. All measurements were from preserved eggs. 
Palene was found to have immature stages much as has been given 
by Morgan for this genus and Meinert for Pseudopalene. The 
larve of Ammothella, Tanystylum, Clotenia, Lecythorhynchus so 
far as determined were not provided with the long hair-like append- 
ages. The other genera not mentioned at this time were not ob- 
tained in sufficient numbers to draw any conclusions. Anoplodac- 
tylus of the two species found were provided with the long append- 
ages in early stages. 
On the piles at Balboa bay, great masses of hydroids of several 
species may be found, the species which is most abundant seems to 
be Tubularia crocea Ag. Living among these hydroids are spider 
crabs, amphipods and other crustaceans, molluscs, and other hy- 
droids. Among a mass of old tangled stems in a single location a 
large number of adult males of 4. erectus was found bearing egg 
masses in all stages from the egg up to the first larval stage. Figs. 
1 and 2 are drawings from such stages. This was in the first week 
of September, 1915. Earlier in the same year Mr. F. W. Daniels 
brought me some hydroids that were literally swarming with pycno- 
gonids. These were from the same locality. In these hydroids 
were found the stages shown in Figs. 3 and 4. These larve were 
very abundant in the digestive cavities of nearly every polyp. In 
some cases three or four might be found in one place. Swarming 
over the surface of the hydroids were the more mature stages, some 
small, others larger but at this particular place none of them mature. 
Many were such as shown in Fig. 5 with the fourth pair of legs 
represented by lobes at the caudal end of the body. Judging from 
the observations made, eggs are produced in summer and early fall; 
the long-armed first stage larve come from the males at various 
times and as they reach the hydroids the long appendages are lost, 
probably by a moult and then by two distinct stages such as shown 
in Figs. 3 and 4, they grow in size, three pairs of legs grow out 
and they leave the interior of the polyps and live for a time in the 
immature state clinging to the gonosome or tentacles of the hy- 
