Weller — Kinderhook Faunal Studies. 471 



origin of the northern Kinderhook fauna from the Chemung , 

 although the main portion of the Chouteau fauna is believed 

 to have originated or at least to have migrated from the far 

 west. 



EXPLANATION OF PLATES. 



Plate I. — 1, Zaphrentis sp. undet. — 2-3, Actinocrinus ? sp. uadet. 4. 

 Agaricocrinus ? sp. undet. — 5-6, Orthothetes chemnngensis (Con.), Two ped- 

 icle valves. — 7, Chonetei glenparkensis n. sp. — 8-12, Chonetes sp. undet. — 

 13-16, Eunella compreaaa n. sp., Brachial views of four individuals. — 17, 

 Atrypa spinosa Hall, Brachial view of the only specimen observed. — 18- 

 22, Spirifer jeffersonensis n. sp., two views of one pedicle valve and views 

 of three bracalal valves. — 23-26, Delthyris misiouriensis n. sp., two views 

 of one pedicle valve and views of two brachial valvea. — 27-28, Delthyris 

 guborbicularis a. sp., two views of a pedicle valve. —29-30, Nucleotpira 

 miniman. sp., views of a pedicle and a brachial valve. — 31-32, Ptyctodus 

 eastmani n. sp., two lateral views of a nearly perfect tooth. 



Plate XL — 1-3, Nueula glenparkensis n. ap., left lateral views of three 

 complete specimens. — 4-5, Nuculana diversoides n. sp., lateral views of a 

 right and a left valve. — 6-9, Macrodon sulcatus n. sp., views of two left and 

 two right valves. — 10-11, Schizodus appressus (Con.), lateral views of two 

 right valves. — 12-13, Modiomorpha lamellota n. sp., lateral views of two 

 left valves. — 14-17, Modiola missouriensisn. sp., lateral views of three right 

 valves and one left valve. — 18-19, Cypricardinia tubcuneata n. sp., lateral 

 views of two right valves. — 20-23, Bellerophon ulrichi n. sp., dorsal views 

 of three individuals and a view of the aperture of a fourth. — 24, Bellero- 

 phon jefersoneniis n. sp., dorsal view of a typical specimen. — 23-26, 

 Ptychomphalus missGuriensis n. sp., lateral view of a nearly complete Indi- 

 vidual, and an apical view of another less complete one. — »7-28, Naticop- 

 $ia paucivolutus n. sp.. lateral views of two specimens, one of them show- 

 ing the aperture. — 29, Tropidodiscus cyrtolites (Hall), lateral view of the 

 most perfect individual observed. — 30-31, Platycerat glenparkensis n. 

 sp., right lateral views of two individuals. — 32-33, Platyceras evolutus n. 

 sp., right lateral views of two individuals. — 34-35, Platyceras erectoidei 

 n, sp., right and left lateral views of one specimen. — 36-37, Orthonychia 

 ungula n. sp., right lateral views of two individuals, the larger and straighter 

 one being the type of the species, — S8-3», Orthonychia jeffersontnsis u. sp., 

 lateral views of two individuals. 



Issued, December 21, 1906. 



