Proceedings of the Biological Society of Washington, 103. köide,3–4. number

adult American anal anal-fin anal-fin rays antennae apical basal base Biological Society body Canu & Bassler carapace carina caudal caudal-fin Centrolenella Centrolenidae chabanaudi characiforms collected Creek Crustacea Cutler & Cutler Decapoda distal Distribution dorsal fin dorsal view Duellman eastern Pacific Eosentomon euhystrix fauna female Galapagos genera genus Gray Gulf of California holotype hooks Ijima introvert Isabela Islands isopod labrum lacking lateral Lendenfeld length lobe male maxilla maxilliped mesial Monte Seco Moojenichthys Museum of Natural National Museum Natural History nigrescens oligomerus omnitectus Osburn pair papillae paratype peduncle pereiopod pereopod Peru Phascolosoma Phascolosoma Phascolosoma Phymosoma Physcosoma pigmented pleopod posterior margin posteriorly proximal ridge rounded scales Schulze scolops segment setae Sipuncula sipunculids Sipunculoidea slightly Sluiter Society of Washington specimens spines Stephen & Edmonds subspecies surface Symphurus taxa teeth tergum tooth Topsent Triportheus tubercles uropod USNM ventral width worms Zoology