Exhibition of preparations illustrating (A) the enlargement, yet complete circumscription of the porta in an alinjected hydrencephal, (B) the continuity of the diacoelian endyma from the mesal surface of the thalamus over the habena to the diatele, (C) the insula in a dog, monkey, chimpanzee, and porpoise Exhibition of preparations illustrating (A) the enlargement, yet complete circumscription of the porta in an alinjected hydrencephal, (B) the continuity of the diacoelian endyma from the mesal surface of the thalamus over the habena to the diatele, (C) the insula in a dog, monkey, chimpanzee, and porpoise