Hl. 8. Wittiams—Fauna of the Chemung Group. 99 
In 1866, Professor Worthen (Illinois Geol. Report, i, p. 108), 
as had been proposed in 1861, by Meek and Worthen (this 
Journal, vol. xxxii, p. 167, defined the Kinderhook group as 
including all the western deposits lying between the Black 
slates and the Burlington limestone, including these beds of 
lowa and their fauna. Leaving the question of the precise limits 
and horizon of the Lime Creek fauna of Iowa for more thorough 
Investigation, we take this fauna alone for comparison with that 
of the New York rocks. 
The species as described by Hall, 1858, and Hall and Whit- 
field, 1878, are as follows: 
Orthis Towensis, Crania familica, 
Strophodonta arcuata, Stromatopora incrustans, 
Strophodonta reversa, Fistulipora occidens, 
Strophodonta demissa, Zaphrentis solida, 
roductus dissimilis, Alveolites Rockfordensis, 
Spirifer Hungerfordi, Pachyphyllum Woodmani, 
Spirifer tiney?, Pachyphyllum solitarum, 
Atrypa reticularis, Campophyllum nanum, 
A. reticularis, var. occidentalis, Chonophytum ellipticum, 
Strophodonta canace, C 
Cryptonella Calvana, Stomatopora alternata, 
pirifer Orestes, Aulopora saxivadum. 
Spirifer cyrtiniformis, 
This is a list of twenty-five species, fourteen of which are 
Brachiopods, Of the fourteen, eight at least are represented in 
the fauna at High-point, Naples, N. Y., and constitute the large 
majority of all the Brachiopods found in that locality. 
The Rhynchonella pugnus Martin, of beds at Rockford, Indi- 
ana, and at Chouteau, Missouri, and other localities of the 
Kinderhook group, has not been recorded from these Lime 
Creek beds of Iowa, but the author has lately examined speci- 
mens from beds of apparently the same horizon in the central 
Portion of Iowa, which are identical with the Ithaca variety of 
