66 THE NAUTILUS. 



NOTES. 



Polygyra mooreana W. G. B. 



Near the gravel pit north of Waco, I found two adult and three 

 juvenile specimens of a variety of tins species with a hirsute epi- 

 dermis. Three of these were found under a rock lying at the foot of 

 gravel bank. A fourth was attached to the under side of a plank 

 lying across a spring about three or four yards away. The fifth ex- 

 ample was crawling around in the damp grass about a yard from the 

 spring. In the living specimen, the hairs are very conspicuous and 

 stand straight out from the shell. Living examples of the ordinary 

 type were afterwards found on all the surrounding elevations, but 

 the hirsute variety seems to be confined to the vicinity of the spring. 



Limax flavus L. 



This species is now common, but must have been introduced 

 within the last three years. Prior to that time a great many slugs 

 were collected by students of the Biological Department of Baylor 

 University. These are now in the University Museum, and all prove 

 to be specimens of the native species Philomycus carolinensis Bosc. 

 Most of my examples of L.flavus were captured during the spring of 

 the present year. 



Planorbis trivolvis Say. 



This pond snail is rare. All of the examples I have seen came 

 from Day's Lake about five miles notheast of Waco. 

 Planorbis tumidus Pfr. 



This species is our most abundant Planorbis. A large, light- 

 colored variety was formerly abundant in Waco Creek. A small, 

 depressed form is found in Hog Creek in considerable numbers. 

 Physa sp. 



Imperfect specimens of an indeterminate Physa were picked out 

 of drift material on the Middle Bosque River. The spire was broken 

 in all these specimens and while Bryant Walker stated that he was 

 certain that they were different from anything that I had sent him 

 before, he was unwilling to attempt to name them until he could ex- 

 amine more perfect material. 

 Lymnsea sp. 



We have at least one other species of Lymncza but of this form only 

 juvenile examples, too young for determination, have been collected. 

 Quadrula pustulosa Lea. 



