PLATE. 25 
All specimens coated and magnified x 31.5 
Fic. 1. Hibbardella (Roundya) sp. 
Lateral view of specimen X 423. 
Fics. 2-5. Hibbardella (Roundya) barnettana Hass 
2a. Aboro-lateral view of specimen X 154. 2b. Lateral view of specimen X 154. 3a. Anterior 
view of specimen X 152. 3b. Posterior view of specimen X 152. 4a. Postero-lateral view of 
specimen X 151. 4b. Lateral view of specimen X 151. 5a. Lateral view of specimen X 153. 
5b. Aboral view of specimen X 153. 
Fic. 6. Gen. nov. A sp. 
a. Lateral view of spectmen X 409. b. Oral view of specimen X 409. 
Fic. 7. Gen. nov. B sp. 
a. Lateral view of specimen X 410. b. Aboral view of specimen X 410. 
Fics. 8, 9. Plectospathodus ? sp. nov. A 
8a. Inner lateral view of specimen X 313. 8b. Oral view of specimen X 313. 9. Inner lateral 
view of specimen X 312. 
Fics. 10-12. Plectospathodus ? sp. nov. B 
10. Inner lateral view of specimen X 427. 11. Inner lateral view of specimen X 428. 12. 
Inner lateral view of specimen X 314. 
Fics. 13-14. Hibbardella (Hassognathus) separata (Branson & Mehl) 
13a. Lateral view of specimen X 150. 13b. Aboral view of specimen X 150. 13c. Posterior 
view of specimen X 150. 14. Lateral view of specimen X 149. 
Fic. 15. Hibbardella (Hibbardella) sp. 
a. Posterior view of specimen X 441. b. Anterior view of specimen X 441.’ 
Fics. 16-18. Hibbardella (Hibbardella) cf. macrodentata Thomas 
16a. Posterior view of specimen X 147. 16b. Oral view of specimen X 147. 17a. Lateral view 
of specimen X 146. 17b. Posterior view of specimen X 146. 18a. Lateral view of specimen 
X 148. 18b. Oral view of specimen X 148. 18c. Posterior view of specimen X 148. 
Fics. 19-20. Hibbardella (Hibbardella) acuta Murray & Chronic 
19a. Posterior view of specimen X 139. I9b. Anterior view of specimen X 139. 20. Lateral 
view of specimen X 422. 
Fic. 21. Hibbaradella (Hibbardella) parva sp. nov. 
a. Anterior view of holotype X 144. b. Posterior view of holotype X 144. 
Fic. 22. Hibbardella (Hibbardella) ortha Rexroad 
a. Posterior view of specimen X 143. b. Anterior view of specimen X 143. 
Fics. 23-25. Hibbardella (Hibbardella) milleri Rexroad 
23a. Anterior view of specimen X 140. 23b. Posterior view of specimen X 140. 24a. Anterior 
view of specimen X 141. 24b. Aboral view of specimen X 141. 24c. Posterior view of 
specimen X I4I. 25a. Anterior view of specimen X 142. 25b. Posterior view of specimen 
X 142. 
