The serpent stars were not especially studied for the eggs, but during July several hundred were collected from various places. These were mostly of one species. About one-third of these contained well developed ova. On July 14th and 20th, six individuals of the genus Ophiothrix deposited eggs in the aquarium jars. During August three out of twenty specimens had ova well developed, many may have been young.
Comparatively few female sea urchins were found. Out of 50 individuals opened, 36 were males, six females, and the rest young. Miss Wang also found that the males were more numerous than the females as they were collected, four to one. Miss Wang was able to keep the sperm alive for 96 hours in the laboratory before we had running salt water.
In the common shore goose-neck barnacle Mitella, ova and segmentation stages were found during the summer.
The common rock crab, Pachygrapsus, was examined many times during July and very few adult females were without eggs. During the same day mature ova and advanced embryos were found. August 10th, about half the females were without eggs. On September 4th, about two-thirds were without eggs. The early summer seems the more active spawning season.
A live female deeper sea crab, Loporhynchus, was caught on June 25th. The enormous mass of eggs was unsegmented and failed to segment in the laboratory, although the animal was kept alive for some time. On July 20th, another female was caught, the embryos were well advanced and it was possible to see the heart beat under the microscope. They lived only a few hours.
The sand crabs of the genus Eremita were found laying their eggs all summer. Some hundreds were examined, and it was found that up to September egg masses were nearly always found with the females. In the whole season, out of 236 examined, only 11 in September were without eggs. It was found that while the eggs on the swimmeretts were developing into crabs another egg mass was being formed in the ovaries, this last reached maturity about the same time that the young crabs on the swimmeretts hatch.
A species of Cypris was found in a pool about 1½ miles up Laguna canyon. These had many eggs on July 1; by July 17 no eggs were found.
A number of species of isopods and amphipods were found to have eggs during the summer, and during September it was very easy to obtain Ligyda with eggs or young, although the proportion of young stages was becoming less.
Members of the genus Caprella were found with eggs at different times during the summer and up into the fall.