’ THE KIMMSWICK AND PLATTIN LIMESTONES 
207 
20. Holopea cf. parvula Ulrich 
Plate XXI j jig, 6 
A specimen of Holopea, 24 mm. in diameter, was found at the 
top of the Plattin limestone at Conn’s Ford. In the elevation 
of its spire and in the rate of enlargement of its last volution, 
this specimen resembles the much smaller species Holopea parvula 
(plate XXII, fig. 7, of this bulletin) , from the Flanagan member 
of the Trenton of central Kentucky. 
21. Hormotoma gracilis angustata Hall 
Plate XXI, jig, 8 
A species of Hormotoma is very abundant at every locality in 
Ralls County, where the top of the Plattin limestone is exposed. 
The specimens attain a larger size than those ordinarily referred 
to Hormotoma gracilis angustata. Compared with Hormotoma 
gracilis suhlaxa, from the Auburn of Lincoln County, the volu- 
tions are less oblique. 
22. Hormotoma (?) major Hall 
This species is quite common in the coarsely granular or crys- 
talline McCune limestone in Pike County; if the name McCune 
be restricted to strata equivalent to the exposures found near 
McCune station, then the species may be said to characterize 
this division of the Kimmswick, using the latter term in the 
broad sense employed by Branson. One of the Pike County 
specimens was figured by Ulrich in the Paleontology of Minne- 
sota, vol. Ill, pt. 2, 1897, on plate 71 (figs. 5, 6). 
23. Maclurina manitobensis Whiteaves 
A single specimen, 50 mm. wide, from the lower part of the 
Hormotoma major or McCune zone, was found on Sanders branch, 
in Ralls County. It is referred to Maclurina on account of the 
small width of the umbilicus. While the shell is considerably 
