PLATE XVII. 



PAOE 



Fig. 20 a. Section from Crioceras percostatus. ■ 77 



Fig. 27. Baoulites Chicoensis. Natural size. 80 



a. Section. 



Fig. 28. Baculites, Sp. indet. Natural size. 81 



Fi"'. 31. Atukia Mathewsonii. Natural size. 59 



