216 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



The sand crabs of the genus Erem'tta were found layuig 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. Tt 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 1 ^ 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. 



Of the pvcnogonids, the following genera were found with eggs 

 during the summer: Lecythorhynchiis, AmmotheUa of two species; 

 Halosoma, Pycnogonhim, Palene, Tanystylum of two species. 



A number of chitons were examined, but with negative results. 

 Probably many were young. 



Some of the bivalveci forms were examined, but the character of 

 the period of reproduction is not yet determined. 



The sea hare, Aplysia, laid its eggs in the aquarium jars during 

 the middle and late summer. 



Many of the species of nudibranchs collected during the sum- 

 mer were found to deposit eggs in the laboratory. One species, a 

 light brown form, was found abundantly in kelp hoki fasts. They 

 laid coiled ribbon-like masses of eggs. 



Eight different individuals of the genus Doris deposited eggs in 

 the laboratory. 



On July 28, two of the genus Hermisscnida anci one SpuriUa ( ?) 

 deposited eggs. 



Laila and several unknown forms deposited eggs in the labora- 

 tory during the first part of September. 



(Contribution from the Zoological Laboratory of Pomona College) 



