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Morse, M. P. (1976). Hedylopsis riseri sp. n., a new interstitial mollusc from the New England coast (Opisthobranchia, Acochlidiacea). Zoologica Scripta. 5: 221-229.
Morse, M. P. (1976). Hedylopsis riseri sp. n., a new interstitial mollusc from the New England coast (Opisthobranchia, Acochlidiacea). Zoologica Scripta. 5: 221-229.
