F\iuna of the Morrow Group 
73 
Girty’s name was first applied to a Productus from the Madison 
limestone, of Mississippian age, in Yellowstone National Park. 
P. cora is a form which ranges throughout the Mississippian and 
Pennsylvanian terranes of North America in great abundance 
and with little or no variation. It occurs also in the Upper Car- 
boniferous of South America and Eastern Europe so that its 
distribution is as great as its range. P. nanus is known from 
the Lower Coal Measures of Iowa. 
The genus Pustula includes those members of the older genus 
Productus whose ornamentation is essentially spinose rather 
than costate. Six species, three of which are new, have been 
referred to it. P. nehraskensis, one of the most characteristic 
of Pennsylvanian brachiopods, ranges throughout the Coal Meas- 
ures of the Mississippi valley and is present in the western 
Upper Carboniferous limestones. P. pertenuis is found in the 
Coal Measures of Nebraska, Oklahoma, and Kansas, and in the 
last-named state ranges from Stage B to Stage G of Beede and 
Rogers’s section. It has been questionably identified from the 
Hermosa of Colorado. The material at hand is probably not 
quite typical but is certainly very closely related to the Coal 
Measures forms. P. punctata has a distribution similar to that 
of P. nebraskensis but apparently was not so perseverant a form 
as it is not known in Kansas above the Burlingame limestone 
in Series III; it is probably a descendant of the Mississippian 
P. alternata. 
The Telotremata include half of the Morrow brachiopods. 
Two of the forms are rhynchonelloids, Pugnoides triangularis 
and Rhynchopora magnicosta, both new species. The former 
genus is represented in Mississippian strata by several forms 
but is known to include only one other Pennsylvanian brachiopod, 
P. uta (Marcou). Rhynchopora likewise is more abundant in 
Lower than in Upper Carboniferous strata and only two other 
species have been referred to it from the later series. 
Terebratuloids are much more abundant. Dielasma arkansa- 
num and D. subspatulatum were originally described by Dr. 
Weller from collections made in Washington County, Arkansas ; 
at that time their stratigraphic position was not definitely known. 
The former is very rarely present in the Morrow formations 
and has been identified by the writer from the Fayetteville shale. 
