ABSTRACT This study reviews Crangopsis based on newly collected material from Carlops, Bearsden (and equivalent exposures of the same horizon), Granton and Ardross and a redescription of older collections mostly held in The Hunterian, University of Glasgow, Scotland. Two new species, Crangopsis carlopsensis sp. nov. and Crangopsis baljaffrayensis sp. nov., are described based on diagnostic character differences such as the shape of the pleura on the pleon. Newly observed structures on Crangopsis include a short acute ridge of unknown purpose on the pleonal pleura, a short rostrum, a vertical straight cervical groove on the carapace, as well as several thoracic body segments (thoracomeres) that do not appear to be attached to the carapace. The eight paired thoracopods and two maxillipeds and the separate thoracomeres indicate that Crangopsis is an early member of the Mysidacea.
Neil D. L. CLARK (Wed,) studied this question.