76 Trans. Acad. Sci. of St. Louis. 



yellow clay. At the highest point, the bluffs are only 

 about 20 feet, but average about 15 feet for a distance of 

 about a quarter of a mile. The gully is dry during the 

 greater portion of the year. A few small water pockets 

 are fed by tiny springs but the moisture evaporates so 

 rapidly that a running stream is seldom formed. The 

 majority of the hollows in the bed are filled with rain 

 water. A few of them are as much as a foot in depth, 

 but the average is only three or four inches. The bluffs 

 are constantly shaling off and the bed of the gully is 

 strewn with small shattered masses of limestone. The 

 hill on the east side is covered with a heavy growth of 

 Bock Cedar, Juniperus sabinoides Nees, and the one on 

 the west side with numerous trees, shrubs, and vines of 

 many species. 



FAUNA. 



MAMMALIA. 



8 Peromyscus maniculatus pallescens Allen. 



REPTILIA. 

 4 Holbrookia texana Troschel. 4 Cnemidophorus gularis B. & G. 



8 Eumeces quinquelineatus Linn. 3 Eutaenia proximaSay. 

 6 Leiolepisma laterale Say. 3 Storeria dekayi Hollbrook. 



AMPHIBIA. 

 3 Bufo ameircanus LeConte. 3 Rana pipiens Schreber. 



3 Bufo valliceps Weig. 3 Lithodytes latrans Cope. 



3 Acris gryllus crepitans Baird. 



MOLLUSCA. 



Helicina orbiculata tropica Jan. Bulimulus dealbatus liquabilisRve. 



Praticolella berlandieriana Mor. Bifidaria sp. 



Polygyra mooreana W. G. B. Vitrea indentata umbilicata Sing. 



Polygyra texasiana Mor. (Banded 6 Omphalina friabilis W. G. B. 



form) 6 Agriolimax agrestis Linn. 



Polygyra roemeri Pfr. Pyriamidula alternata Say. 



3 These species were found only in the gully. 



4 East Hill, living among rocks and around the bases of the cedars. 



6 West Hill only; among leaves and around stumps and fallen trees. 



8 Not recorded in the writer's report on the Mollusca of McLennan County 

 (Nautilus XXI 1 : 63-67. 1908), and since found only at this place. The slug was 

 identified by Bryant Walker. It is not uncommon and is found under fallen 

 branches and pieces of dead bark. Very few living examples of Omphalina 

 were discovered, but hundreds of weather-worn shells are imbedded in clay 

 and strewn along the rocks on both sides of the gully. 



