102 



PUPILLIDAE 



GASTROCOPTA PROCERA (Gould) 



Pupoids of the species procera, which is mostly southern in 



distribution, are rare in Illinois. The shells of this species are 



usually cinnamon-brown in color, somewhat glossy in texture 



and marked by lightly impressed lines of growth. 



They have 5 or 6 convex w^horls with sutures 



that are noticeably deep. 



Gastrocopta procera procera (Gould). Fig. 

 A. In the shell of the typical variety, less than 

 one-eighth inch (2.5 mm.) in height, the body 

 whorl has a perceptible crest behind the outer lip. 

 The rounded aperture has 5 folds and lamellae: 

 a bifid parietal lamella representing the combined 

 parietal and angular lamellae, a columellar la- 

 mella, a small upper palatal fold, a large lower 

 palatal fold placed far within the aperture and 

 directly under the parietal lamella, a small basal 

 fold placed well within the aperture. The wide 

 peristome is rolled outward. 



This variety is abundant in Illinois only near 

 Albion, Edwards County, but it is reported from 

 eight other counties, of which Du Page is the 

 most northern and Union the most southern. Its 

 habitat is under leaves and about old logs and 

 sticks. 



Gastrocopta procera rncclungi (Hanna & 

 Johnson). Fig. B. This variety, less than one- 

 eighth inch (2.2 mm.) in height, is somewhat 

 smaller than the typical form. The thickened 

 peristome of mcclungi is more convex, so that 

 the greatest thickness of the lip callus is at the edge of the 

 aperture, and not within the aperture as in procera procera. 

 The parietal lamella is bifid and forked in front, and the col- 

 umellar lamella has a nodule at the base which gives it the 

 appearance of being duplicated. 



Only a very few specimens of this rare variety have been 

 collected in Illinois. It has been found on a railway embank- 

 ment in Effingham County, on a Mississippi River blufiE in 

 Monroe County and on the isolated hill bordering the Missis- 

 sippi River at Grand Tower in Jackson County. 



