202 



ZONITID^ 



Vitrea indentata Say. 



One specimen (No. 113) was taken Aug. 20, among a mass of 

 drifted rotten wood and dead leaves deposited at the mouth of a ra- 

 vine in the lowland forest (Sta. IV, c), in company with a young speci- 

 men of the carnivorous Circinaria concava; and another (No. 140), 

 on Aug. 22, under leaves at the base of a ravine slope (Sta. IV, b), 

 in woods so dense that there was very little herbaceous vegetation, but 

 a thick ground cover of leaves and vegetable mold. The interesting 

 ant Stigmatomma pallipes, Myrmica rubra scabrinodis schencki, and 

 the larva of Meracantha contracta were found here. Specimens were 

 also taken Aug. 26 (No. 164) under a small decayed limb, on the 

 ravine slope (Sta. IV, fc) in company with Vitrea rhoadsi, Polygyra 

 clausa, and Pyrarmdula perspectiva. 



Vitrea rhoadsi Pilsbry. 



This snail was taken under a small damp decayed limb on a 

 wooded ravine slope (Sta. IV, b) in company with V. indentata, 

 Pyrarmdula perspectiva, and Polygyra clausa (No. 64). Mr. F. C. 

 Baker informs me that this species has not previously been recorded 

 from Illinois. 



Zonitoides arborea Say. 



This snail was taken on a fungus wliich was growing on a de- 

 cayed stump in the upland forest (Sta. IV, a) Aug. 17 (No. 71), 

 in company with the mollusks Pyramidula perspectiva, Circinaria 

 Qoncava, and Philomycus carolinensis, the ant Aphcenogaster fulva, 

 and the white ant Vermes flavipes. Also taken from a moist rotting 

 stump, on the slope of the valley (Sta. IV, &), Aug. 17 (No. 84), 

 in company with the snail P perspectiva, the slug P. carolinensis, 

 newly established colonies of the ant Camponotus herculeanus penn- 

 sylvanicus, and the beetle Passalus cornutus. 



This snail appears to be mainly a species of the woodland, where 

 it occurs under decaying wood and vegetable debris. 



Hotter ('98, p. 219) records this species from an old grave. This 

 suggests a subterranean habit. (Cf. Baker, '11, p. 155.) 



PHIL0MYCID.a3 



Philomycus carolinensis Bosc. Carolina Slug. 



Several young specimens of this slug (No. 71), about 5 mm. long 

 when contracted in alcohol, were found (Sta. IV, a) Aug. 17 in the 

 upland forest on a well rotted stump overgrown in part by a felt-like 

 fungous growth. The finding of these young slugs and the finding 



