PROC. BIOL. SOC. WASH. 94(3), 1981, pp. 774-786 OCCURRENCES OF SHRIMPS (NATANTIA: PENAEIDEA AND CARIDEA) IN CENTRAL CALIFORNIA AND OREGON Jon D. Standing Abstract. — Records are given for ten species of shrimps collected in cen-tral California and Oregon. These include six northern range records, one southern range record, and three intermediate occurrences. Particularly noteworthy are the new localities and observations reported for the fresh-water shrimp, Syncaris pacifica, and the estuarine shrimp, Palaemon mac-rodactylus. Some of the northern range records may represent temporary range expansions that are established by larvae recruited from the south during warm water periods. The shrimps of California were last reviewed comprehensively by Schmitt (1921). Since then, most workers have focused on specific taxa (Chace, 1951; Hart, 1964; Wicksten, 1977, 1978). Crossing taxa in this paper, I report new range records and other occurrences for ten species of Penaeidea and Caridea. The records are based on my own collections, on those of some col-leagues, and on certain museum material that came to my attention. In no case were any museum holdings examined exhaustively. Specimens are lodged in the California Academy of Sciences (CAS), the Moss Landing Marine Laboratory (MLML), the National Museum of Natural History (USNM), and the Allan Hancock Foundation (AHF). Suborder Natantia Section Penaeidea Family Penaeidae Subfamily Penaeinae Penaeus (Farfantepenaeus) californiensis Holmes, 1900 Penaeus canaliculatus Holmes, 1895:581. Penaeus californiensis Holmes, 1900:218, pi. 4, figs. 64-69. — Burken-road, 1938:67, figs. 10-11 & 14-15.— Brusca, 1973:218, fig. 7.29.— Pala-cios, 1968:341, figs. 5-6.— Word & Charwat, 1976: 17.— Edwards, 1978:151.— Holthuis, 1980:39. Penaeus brevirostris. — in part, Rathbun, 1902a:287; 1904:146. — Schmitt, 1921:21, fig. 9.— Burkenroad, 1934:91.