Explanation of Plate XXIII. 



Page 



Fig. 1 . Borycrinus gouldi 173 



Lateral aspect of calyx. (Keyes collection.) 

 Carboniferous, Keokuk limestone. 



Fig . 2. Borycrinus unicornus 169 



Anal view. (Keyes collection.) 

 Carboniferous, Lower Burlington limestone. 



Fig. 3. Gennceocrinus trijugis 174 



3a. Lateral view of calyx. (After Miller) . 

 3b. Dorsal aspect of same. 



Carboniferous, Klnderhook limestone. 



Fig . 4. Batocrinus calvini ISO 



Calyx of type specimen. fRowley collection.) 

 Carboniferous, Burlington limestone. 



Fig. 5. Batocrinus trohiscus 181 



Lateral view of calyx. (Keyes collection .) 

 Carboniferous, Upper Burlington limestone. 



Fig. 6. Batocrinus rotundus 182 



6a. Calyx. (Keyes collection.) 



6b. Specimen with arms. (Same cabinet.) 



Carboniferous, Upper Burlington limestone. 



Fig . 7 . Batocrinus pyriformis 182 



Specimen with arms . (Keyes collection . ) 

 Carboniferous, Upper Burlington limestone. 



Fig. 8. Batocrinus laura • 182 



Side view of calyx. (Keyes collection.) 

 Carboniferous, Upper Burlington limestone. 



FjG. 9. Eretmocrinus verneuilianus 177 



Specimen with anal tube preserved. (Keyes collection.) 

 Carboniferous, Upper Burlington limestone. 



Fig . 10 . Eretmocrinus corbulis 175 



Side view of calyx. (Keyes collection ) 

 Carboniferous, Lower Burlington limestone . 



Fig. 11. Eretmocrinus dfpressus 176 



Type specimcD . (Mus. Mo. Geol. Sur.) 

 Carboniferous, Lower Burlington limestone. 



Fig. 12. Eretmocrinus expansus 175 



Type specimen. (Mus. Mo. Geol. Sur.) 

 Carboniferous, Lower Burlington limestone. 



Fig. 13. Eretmocrinus calyculoides 177 



A specimen with arms . (Keyes collection . ) 

 Carboniferous , Upper Burlington limestone . 



