214 Trans. Acad. Sci. of St. Louis. 



U. of M. Coll. No. 1444 (in part). — 6-8. Straparollus obtusus (Hall). Three 

 views of a nearly perfect specimen. U. of C. Coll. No. 6676. — 9. Loxonema 

 sp. undet. U. of M. Coll. No. 1450 (in part). — 10-11. Pleurotomaria ? 

 quinquesulcata (Win.). Two views of the specimen supposed to be the type. 

 U. of M. Coll. No. 2005. — 12. Pleurotomaria ? sp. undet. U. of C. Coll. 

 No. 6677. — 13-14. Orthoceras indianense (Hall). Outline views drawn 

 from an imperfect specimen. U. of C. Coll. No. 6678. 



Plate XVIII. — 1. Gyroceras burling to nensis Owen. Tracing of the origi- 

 nal illustration of the type specimen. About one-third natural size. 



Plate XIX. — 1-4. Gamarophoria caput -testudinis (White). 1-3. Three 

 views of the best of the type specimens from the Burlington limestone. 4. 

 An imperfect specimen from Bed No. 7. U. of M. Coll. No. 1376. — 5. 

 Camarotoechia persinuata (Win.). The specimen believed to be the type. 

 U. of M. Coll. No. 1998. — 6-7. Schizophoria subelliptica (W. & W.). Two 

 views of the type specimens. U. of M. Coll. No. 1349. — 8. Productus 

 punctatus Martin. U. of M. Coll. No. 2011. — 9. Orthothetes inaequalis 

 (Hall) ? U. of M. Coll. No. 1325. — 10-12. Orthothetes inflatus (W. & W.). 

 Three views of one of the type specimens. U. of M. Coll. No. 1353. 



Plate XX. — Spirifer peculiaris Shum. ? U. of M. Coll. — 2-4. Spirifer- 

 ina solidirostris (White). Views of two of the type specimens. U. of M. 

 Coll. No. 1372. — 5-6. Spiriferina subtexta White. The type specimen from 

 the Burlington limestone. Introduced for comparison with S. solidirostris. 

 U. of M. Coll. No. 1701. — 7-11. Nucleospira barrisi White. Two of the 

 type specimens. U. of M. Coll. No. 1360. — 12. Worthenia mississippiensis 

 [W. & W.). The type specimen. U. of M. Coll. No. 1448. — 13-14. Capulus 

 paralius W. & W.). The type specimens. U. of M. Coll. Nos. 1443. 1994. — 

 15. Capulus vomerium (Win.) View of an authentic specimen. U. of M. 

 Coll. No. 2010. — 16. Igoceras undata (Win.). The type specimen. U. of M. 

 Coll. No. 1995. — 17-18. Bellerophon panneus White. Two views of the best 

 of the type specimens. U. of M. Coll. No. 1435. — 19. Leptopora typa. Win. 

 The type specimen. U. of M. Coll. No. 1327. 



Issued December IS, 1901 . 



