Fig. 34. The interior of a brachial valve; showing the cardinal process and low 
crural plates. ; 
Middle Devonian. Zreré, Brazil. 
Fig. 35. Ventral view of a preparation; showing three volutions of the sire 
cone which is directed toward the lateral margin of the valves. 
Hamilton shales. Alden, N. Y. 
Fig. 36. An enlargement of the external surface; showing the EEE rows 
of elongate pustules. . 
Hamilton shale. Western New York, 
232 
