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, Aetinocrinua 7 sp. nndet. 4. 

 Agarieocrinus ? sp. undet. — 5-6, Orthothetts chemnngensia (Con.), Two ped- 

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

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

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

 32, Spirifer jefferaonensis n. sp., two views of one pedicle valve and views 

 of three bracaial valves. — 28-26, Delthyria miasouriensia n. sp., two views 

 of one pedicle valve and views of two brachial valves. — 27-38, Delthyria 

 auborbicularia n. sp., two views of a pedicle valve. — 29-30, Nucleoapira 

 minima n. sp., views of a pedicle and a brachial valve. — 31-32, Ptyctodua 

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



Plate IL — 1-3, Nueula glenparkensia n. sp., left lateral views of three 

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

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

 two right valves. — 10-11, Schizodtia appreaaua (Con.), lateral views of two 

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

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

 valves and one left valve. — lb-19, Cypricardinia aubcuneata 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 f ourih. . — 24, Belltro- 

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

 Ptychomphalua miaaourienaia n. sp., lateral view of a nearly complete indi- 

 vidual, and an apical view of another less complete one. — 27-28, Naticop- 

 aia paucivolutua n. sp., lateral views of two specimens, one of them show- 

 ing the aperture. — 29, Tropidodiacua q/rtolitea (Hall), lateral view of the 

 most perfect individual observed. — 30-31, Platyceraa glenparkenaia n. 

 sp., right lateral views of two individuals. — 32-33, Platyceraa evolutua n. 

 sp., right lateral views of two individuals. — 34-36, Platyceraa erectoidea 

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

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

 one being the type of the species. — 38-39, Orthonyehia jefferaonanaia n. sp., 

 lateral views of two individuals. 



laaued, December 11,1006. 



