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This paper describes the reproduction and development of Crepidula adunca and Crepidula lingulata from San Juan Island, Washington, USA. Both species were sampled every 2 months to determine the reproductive season and to measure the relationship between adult size and sex, capsule number, egg number, and brood weight. Development of each species is described briefly based on the broods obtained from these samples. As expected for protandrous hermaphrodites, females were larger than males, in both species. Crepidula adunca is an intertidal species that is usually found in stacks of two animals. This species reproduces all year, and embryos develop directly into crawl-away juveniles. Crepidula lingulata is a solitary subtidal species that produces planktotrophic veliger larvae in the summer. These veligers have distinctive pigmentation on the velum and settle 4 weeks after hatching at a shell length of 750| im. Experiments show that associations with conspecifics do influence sex change in C. lingulata: males kept with females were less likely to change sex than those kept alone or with other males.