LATE CENOZOIC GASTROPODS 



15 



Type locality: Campus of University of 

 Illinois, Urbana, Champaign County, Illi- 

 nois; marls exposed in excavations for foot- 

 ings for south greenhouse. 



Collector: T. E. Savage. 



Age designation: Early Wisconsin marl. 



Remarks: Paratypes, no. Z10773, are cat- 

 alogued in the ISGS collection but the speci- 

 mens have not been found. Many other lots, 

 labeled Gyraulus urbanensis, are in the 

 ISGS collection. 



Planorbula indianensis Baker, 1930 

 Plate 3, figures 4-6 



Holotype: Cat. no. P2833, ISGS. 



Original description: Trans. Illinois Acad. 

 Sei., v. 22, p. 430, 1930. 



"Sangamon interval (Montgomery, Ful- 

 ton, Iroquois counties) ; Late Wisconsin time 

 (Chicago deposits, Cool [sic for Cook] Co.). 

 This recently distinguished species is appar- 

 ently extinct, nothing approaching it hav- 

 ing been seen from the recent fauna. It re- 

 sembles armigera but is larger, with a greater 

 axial height and five full whorls. In size it is 

 between armigera and Dall's chrystyi, a re- 

 cent species of northern distribution. This 



species has six full whorls and is different 

 from indianensis. The absence of indian- 

 ensis from deposits between Sangamon and 

 Early Wisconsin, and from the earlier Yar- 

 mouth interval is noteworthy. The type lo- 

 cality is in a deposit near Mt. Vernon, In- 

 diana, beneath a terrace believed to be of 

 Early Wisconsin age. It is thus either Pe- 

 orian or Sangamon in age. In a deposit in 

 Iroquois County, the fossil species from San- 

 gamon strata is indianensis, while the spe- 

 cies living near Sugar Creek at the present 

 time is armigera." 



Height, 3.4; diameter, 8.8; height of ap- 

 erture, 3.2; diameter, 3.1 mm. Holotype. 

 (Measurements mine.) 



Type locality : Uniontown Road, two miles 

 southwest of Mt. Vernon, Posey County, 

 Indiana. 



Collector: Charles V. Theis, date un- 

 known. 



Age designation: Pleistocene, Early Wis- 

 consin. 



Remarks: Three paratypes from the type 

 locality, no. P2833A, are in the ISGS collec- 

 tion, together with a few other lots from 

 various localities. The species is not com- 

 mon in the State. 



PLATE 4 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Figs. 



Figs. 

 Figs. 



Figs. 



Figs. 



Figs. 



Figs. 



1. Valvata sincera illinoisensis Baker, holotype, cat. no. P1671A, ISGA; west end Crystal Lake, Mc- 

 Henry County, Illinois. Enlarged 7.4 times. 



2. Valvata lewisii precursor Baker, holotype, cat. no. P2360, ISGS; 2% miles south and 1 mile west of 

 Lewistown, Fulton County, Illinois. Enlarged 4.4 times. 



3. Valvata tricarinata supracarinata Baker, holotype, cat. no. P928, ISGS; near Morris, Grundy County, 

 Illinois. Enlarged 4.3 times. 



4. Bulimus tentaculatus magnalacustris Baker, paratype, cat. no. P2819, ISGS; southwest corner Michi- 

 gan Boulevard and Walton Place, Chicago, Cook County, Illinois. Enlarged 2.5 times. 



5. 6, 7. Polygyra multilineata altonensis Baker, holotype, cat. no. P740A, ISGS; spiral, basal, and 



apertural views, respectively; Plant no. 2, Mississippi Lime and Materials Company, Alton, Madison 



County, Illinois. Enlarged 0.9 times. 

 8, 9, 10. Polygyra appressa hubrichti Baker, holotype, cat. no. P6629, ISGS; spiral, basal, and apertural 



views, respectively; Valmeyer, Monroe County, Illinois. Enlarged 1.1 times. 

 11, 12, 13. Polygyra profunda pleistocenica Baker, holotype, cat. no. P751, ISGS; spiral, basal, and 



apertural views, respectively; near corner East Sixth and Market Streets, Alton, Madison County, 



Illinois. Enlarged 1.3 times. 

 14, 15, 16. Stenotrema hubrichti Pilsbry, paratype, cat. no. P5137, ISGS; spiral, basal, and apertural 



views, respectively; just south of McCann School, 2 miles northeast of Aldridge, Union County, 



Illinois. Enlarged 2.4 times. 

 17, 18, 19. Polygyra multilineata wanlessi Baker, holotype, cat. no. P2358, ISGS; spiral, basal, and 



apertural views, respectively; 4 miles west of bridge at Havana, in Fulton County, Illinois. Enlarged 



0.9 times. 

 20, 21, 22. Polygyra monodon peoriensis Baker, holotype, cat. no. P1910A, ISGS; spiral, basal, and 



apertural views, respectively; North municipal quarry, near Quincy, Adams County, Illinois. En- 

 larged 2.6 times. 

 23, 24, 25. Polygyra hirsuta yarmouthensis Baker, holotype, cat. no. P2085, ISGS; spiral, basal, and 



apertural views, respectively; 3 miles southwest of Marshall, Clark County, Illinois. Enlarged 



2.4 times. 



