The Pamphlet Collection of Sir Robert Stout: Volume 6
Sub-Class —VI. Leptocaedii
Sub-Class —VI. Leptocaedii.
Skeleton membrano-cartilaginous and notochordal, ribless, no brain. Pulsating sinuses in place of heart. Blood colourless. Kespiratory cavity confluent with the abdominal cavity; branchial clefts in great number, the water being expelled by an opening in front of the vent. Jaws none.