Pomona College, Claremont, California 27 



.02 mm. A. erectus are .03 mm. in diameter, A. calif ornicus .035, 

 A. spiuosissima .0425, A. hi-ungiticiihjta var. calif. .OSIS, T. inter- 

 medium .06, A. tuhercidata MIS, L. marginatus .065, Palene 

 calif orniensis .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 Psctidopalene. The 

 larvs oi Animothella, 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. Anophdac- 

 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 Tnhidaria crncea 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 A. 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 larvae 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 larvae come from the males at various 

 times and as they reach the hydroitis 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- 



