...animals intermediate between the pisces and venues, and in two genera of the last mentioned class. In the lamprey the organs of respiration have seven...external openings on each side of the animal. These lead to the same number of oval bags, the inner membrane of which is constructed like the gills of fishes....

...a new genus intermediate between the lamprey and the myxine, the aphrodita aculeata, and the leech. In the lamprey, the organs of respiration have seven external openings on each side of the animal, leading into oval bags, Which contain a membrane constructed like that of the gills of the fish. It...

...animals intermediate between the pisces and venues, and in two genera of the last mentioned class. In the lamprey the organs, of respiration have seven external openings on each sid^ of the animal. These lead to the same number of oval bags; the inner membrane of which is constructed...

...the apodal chondropterygious fishes, and the least perfect in the system. "In the lamprey (he says) the organs of respiration have seven external openings...and the upper terminates by a fringed edge in the (Esophagus. These bags are contained m separate cavities, nnd enclosed in a thorax resembling that...

...the apodal ehondropterygioue fishes, and the least perfect in the system. " In the lamprey (he says) the organs of respiration have seven external openings...of which is constructed like that of the gills in lishes . There is an equal number of internal openings leading into a tube, the lower end of which...