Five genera and nine species of porcellanid crabs were collected during a cruise of the R/V John Elliot Pillsbury to the Atlantic side of Panama and the northern coast of South America. Most of the species were common, shallow-water forms, taken in Cristobal Harbor, Limón Bay,
Panama Canal Zone. One new species is described and illustrated. An extension of range is reported for Megalobrachium mortenseni Haig, 1962. Pachycheles ackleianus A. Milne Edwards, 1880, and Porcellana sigsbeiana A. Milne Edwards, 1880, are reported for the first time
from the southwest corner of the Caribbean, and a previously questionable record is confirmed for Minyocerus angustus (Dana, 1852).
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.