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Studieson West Indian MarineMolluscs, 1. Risomurex mosquitensis, a new Caribbeanspecies, withremarks on the status of the genusRisomurex (Gastropoda: Muricidae)
After studying the holotype of Engina schrammi Crosse, 1863, it became evident that the genus Riso- murex Olsson & McGinty, 1958, is based on misidentified shells. Material recently collected at the
THE ACTION OF ULTHA-HARD ROENTGEN RAYS ON DROSOPHILA EGGS
The first biological experiment which was made with he aid of the ultra-high voltage apparatus described in a previous publication, was carried out for the purpose to study the action of this