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Twenty-three strains of bacteria isolated from mud samples taken in the Pacific Ocean at depths ranging from 9, 400 to 10, 400 meters have been found to be members of the genus Pseudomonas. From results of Adansonian analysis the strains appear to constitute a new species. Pseudomonas bathycetes n. sp. is therefore proposed and the median organism for the group, strain C2M2 (ATCC 23597), is designated as the type strain. Deoxyribonucleic acid base composition determinations and electron micrographs provide confirmatory evidence for the identification and classification of P. bathycetes.