PLATE XXXVII. 



Page 



EllETMOCKINaTS KEMIBEACHIATUS Var. EXPANSUS W. aiid Sp. . . . 390 



Fig. 1«. Specimen from the Burlington and Keokuk transition bed ; dorsal aspect. 

 Ih. Side view of the calyx ; from same bed. 



Eretmoceinus eemibeaciiiatus (Hall) 388 



2a. Lateral view of a specimen from the Upper Burlington Limestone. 

 2b. Another example from the same bed. 



Eretmockixus magnificus Lyon and Cass 386 



3. A large specimen, with rows of angular nodes following the rays and their 

 subdivisions. 



Eretmocrixus ramulosus (Hall) 387 



4«. Posterior side of a large calyx from Tennessee. 



46. Dorsal aspect of a highly ornamented specimen from Iowa. 



5a. Arm fragment, probably belonging to this species (from Tennessee). 



55. Cross-section of it. 



5c. Upper portion of another arm fragment from the same locality. 



5d. The cross-section. 



Eretmocrixus matuta (Hall) . . 396 



6a. •Specimen with arms ; the anal tube bent outward. 



Qh. Specimen showing the natural curving of the anal tube. 



6c. A large calyx. 



Eretmocrixus coronatus (Hall) 403 



la. Dorsal aspect of the calyx. 



7b. Anterior side of same. 



7c. Ventral aspect of another specimen. 



Macrocrixus carica (Hall) 448 



8. Anterior side of the calj'x. 



Eretmocrinus CLIO (Hall) 393 



9a. Anterior side of the calyx. 



96. Ventral aspect of a more lobate specimen. 



(All specimens in the collection of Wachsmuth and Springer.) 



