16 



ILLINOIS STATE GEOLOGICAL SURVEY 



I am not certain that the paragraph 

 quoted above is the original description, but 

 I have found no other diagnosis of P. indian- 

 ensis in any of Baker's writings known to 



me. 



Polygyra appressa hubrichti Baker, 1937 

 Triodopsis fosteri hubrichti (Baker) 



Plate 4, figures 8-10 



Holotype: Cat. no. P6629, ISGS. 



Original description: Nautilus, v. 51, p. 

 23, July 1937. 



"Shell differing from typical appressa 

 [=Triodopsis fosteri missouriensis Pilsbry] 

 in its much greater size, more elevated spire, 

 rounder aperture, and generally gibbous 

 form. The parietal lamella is long, curved, 

 and extends to the umbilical region as in the 

 typical form. Basal tooth of peristome usu- 

 ally well developed, but the upper denticle of 

 race fosteri rarely developed. Sculpture of 

 fine lines of growth." 



Diameter, 25.5; height, 14.5; aperture 

 diameter, 10.0; height, 7.0 mm. Holotype. 

 (Baker's measurements.) 



Type locality: Valmeyer, Monroe Coun- 

 ty, Illinois. 



Collector: Leslie Hubricht, 1 April 1932. 



Age designation: Pleistocene, Sangamon 

 loess. 



Remarks: Two paratypic examples, no. 

 P6630 and no. P6631, ISGS; other para- 

 types: no. 168631, ANSP, and no. A-1562 in 

 the collection of Leslie Hubricht. Other 

 lots, from various localities, are in the ISGS 

 collection. 



Polygyra hirsuta yarmouthensis Baker, 



1927 

 Stenotrema hirsuta yarmouthensis (Baker) 



Plate 4, figures 23-25 



Holotype: Cat. no. P2085, ISGS. 



Original description: Nautilus, v. 40, p. 

 115, April 1927. 



"Shell differing from recent hirsuta in be- 

 ing uniformly smaller, with a straight pari- 

 etal lamina which is shorter than in the typ- 

 ical form, the denticle on the peristome is 

 smaller, the base of the shell not usually as 



convex, and the basal callus is not as heavy.'' 



Height, 4.2; diameter, 6.6 mm. Type. 

 (Baker's measurements.) 



Type locality: Three miles southwest of 

 Marshall, Clark County, Illinois. 



Collector: Paul MacClintock, 30 August 

 1925. 



Age designation: Pleistocene, Yarmouth 

 loess. 



Remarks: A single paratype, bearing the 

 same number as the type, is in the ISGS col- 

 lection, together with other lots identified by 

 Baker; paratypes no. 142707 are in the 

 ANSP collection. 



Polygyra monodon peoriensis Baker, 



1927 



Stenotrema leai peoriensis (Baker) 



Plate 4, figures 20-22 



Holotype: Cat. no. P1910A, ISGS. 



Original description: Nautilus, v. 40, p. 

 116, April 1927. 



"Shell differing from typical monodon in 

 being smaller, with a smaller umbilical open- 

 ing, a less elevated parietal lamina which is 

 usually joined to the basal lip near the col- 

 umella by a more or less well-developed cal- 

 lus." 



Height, 3.9; diameter, 6.1 mm. Type. 

 (Baker's measurements.) 



Type locality: North municipal quarry, 

 near Quincy, Adams County, Illinois, from 

 loess 15 feet above bedrock. 



Collector: M. M. Leighton and Ben B. 

 Cox, 1923. 



Age designation: Pleistocene, Peorian loess. 



Remarks: Eight paratypical specimens, no. 

 P1910, and many other lots identified by 

 Baker are in the ISGS collection; other par- 

 atypes, no. 142708, ANSP. 



Polygyra multilineata altonensis 

 Baker, 1920 

 Triodopsis multilineata altonensis (Baker) 



Plate 4, figures 5-7 



Holotype: Cat. no. P740A, ISGS. 

 Original description: Nautilus, v. 34, p. 

 65, October 1920. 



