PLATE 6. 



Fig. 17. — ■ Doliophis intestinalis (Laurenti). Buitenzorg, Java, dissected to show development of 



poison gland. Page 137. 



Fig. 18-19. Two views of head of type of Liopeltis libertatis Barbour. Buitenzorg, Java. Page 119. 



Fig. 20. — Bufo obscurus (Barbour). Sarawah, Borneo. Type. Page 75. 



Fig. 21. — Bufo biporcatus Tschudi. Makassar, Celebes. Page 74. 



Fig. 22. — Bufo cavator Barbour. Ampenan, Lombok. Type. Page 74 



(Fig. 18-19 twice natural size. Fig. 20-22 natural size). 



