240 
Kirtley F. Mather 
LOXONEMA. TID^ 
Genus ACLISINA De Koninck 
Aclisina? sp. 
Plate XVI, figures 1, 2. 
The presence of high-spired gastropods in the Morrow fauna 
is indicated by several internal casts, nearly all of which are 
fragmentary, and one very poorly preserved specimen which 
displays the surface markings. The latter consist of about six 
revolving carinae upon each volution; transverse markings are 
apparently not present. The dimensions of the most complete 
of the internal casts, a shell composed of six volutions, are as 
follows : height, 17 mm. ; diameter of last volution, 7 mm. ; height 
of last volution, 5 mm. 
Horizon and locality. Hale formation: East Mountain, 
Fayetteville, Arkansas (Station 136). Brentwood limestone: 
near Fayetteville, Arkansas (Stations 134 and 135). Kessler 
limestone: East Mountain, Fayetteville, Arkansas (Station 209). 
Morrow formation: near Wagoner, Oklahoma (Station 294). 
SUBULITID^ 
Genus MEEKOSPIRA Ulrich 
Meekospira? sp. 
Plate XVI, figure 6. 
Two specimens of a small medium-spired gastropod are in- 
cluded under this title. The shell is composed of about six 
whorls, the last of which comprises nearly one-half the length 
of the shell and is gently convex in outline. The apical angle 
is 35° and the slopes of the spire are straight; the sutures are 
well-defined although all but the last of the volutions are quite 
flat. Surface markings are not apparent and the lower portion 
of the aperture is missing. 
The form is referred to Meekospira with some doubt as it 
may be a Bulimorpha. Of described species of these genera it 
most closely resembles M. inomata (Meek and Worthen) but 
is smaller and more slender than that species. 
Horizon and locality. Brentwood limestone: near Fayette- 
ville, Arkansas (Station 135). Morrow formation: near Ft. 
Gibson, Oklahoma (Station 301). 
