﻿PLATE IV. 



PAGE 



Fig. 1. Gomphoceeas CINCINN atiense , n. sp. Lateral view, natural size, . 19 



la. A transverse section. 

 Fig. 2. Gomphoceeas fabeei, n. sp. Lateral view, natural size, . . 19 



2a. A transverse section. 

 Fig. 3. Pal^astee magnifictts, n. sp. Ventral view, natural size, . . 16 



3a. Dorsal view of the same specimen, natural size. 

 Fig. 4. Heteeoceinus consteictus, Hall. Fragment, natural size, . . 18 



4a. Opposite side of the same specimen, showing the peculiar change that 

 has taken place, that led to the mistake of calling it by a different 

 specific name. 



4b. The upper end of the head of another specimen, showing the armlets, 

 or smaller arms. 



