OF PLANORBIS AT STEINHEIM. HI 



Cloister Pit. 



Formation k, Section 1. 



PI. minutus, line d, figs. 12-16. 



PI. discoideus, line c, figs. 17-19, d 1-11, e 1-12, f 1-14. 



Formation 1, Section 1. 

 PI "iSr line k, figs. 1-4, 11. 

 PL cresceris, line i, figs. 10-14. 

 PI. "Xl"""' line k, figs. 5-10. 

 PI. oxystonius var. cochh'atus., line 1, figs. 4—11. 

 PI. supremus, line I, figs. 12-14. 

 PI. discoideus, line g, figs. 1-9, h 1-10, i 5-9. 



-' '• dvcoideius, ilUe 1, Ug 1. 



PI. trochiformis, line i, figs. 2-4. 

 PI. oxystomus, line 1, figs. 1-3. 



Formation m, Section 1. 

 PI. ■'X'^"' line m, figs. 10-14, p 6-14. 

 PI. oxystomus, line m, figs. 2-9, o 2. 

 PI. supremus, line n, figs. 1-7, o 3-12, p 1-5. 

 PI. supremus var. turritus, line n, figs. 8-13, o 1. 

 PL discoideus, line I, figs. 15-17. 

 PL trochiformis, line m, fig. 1. 



Plate IV. 



Magnified 8 diameters. 



Line a, figs. 1-7 PL minutus. 



Line b, figs. 1-t PL minutus, 5-6, 9 PL triquetrus var. turUnatus, 7-8 PL T,K,T 



Line c, figs. 1-3 PL triquetrus, 4-5 PL '^Z^ 6-9 PL "SSf^ 



Line d, figs. 1-5 PL *;,",SrT uncoiled in various degrees, 6-10 same, but more turbinate. 



Line e, figs. 1-5 PL deiiudatus, uncoiling excessive, but turbination slighter than in 6-8 ; 9 broken adult, 

 whorl of, 10, the young of the same shell perfectly flat and in part closely colled, 11, young stage of another 

 broken out. This, though not a distinct figure shows that the coiling is in the same plane in tlie young. 



Line f, figs. 1-8 PL SS. 



Line g, fig. 1, PL costatus, 2 PL costatus var. distortus, 3-10 PL costatus. 



Line h, figs. 1-7 PL costatus (PL costatus var. major of Hilg.), var. acuto-costatus. 



Line i, figs. 1-5 PL costatus va,v. 2)hitystomus, 6-12 PL costatus {=maJor Hilg. pars.), var. ohtuso-costatus, 

 much distorted. 



Line k, figs. 1-7 PI costatus var. ohtuso-costatus (= PL major Hilg. pars.), 8 PL Znutm. 



Plate V. 



Magnified 6}i diameters. 



Line a, figs. 1-4, PL levis from Undorf. 



Line b, figs. 1-7, PL parvus. 



Line c, figs. 1-6, PL j;^';^™ 7 PL J'J™ turretted variety. 



1 The different forms of PI. denudatus, PL costatus var. datus, PL distorlus, ani PLplatystomus, huthaving neglected 



distortus and PL costatus var. platystomus would probably doing this, and even in one place on page 10, spolveu of PL 



have been more clearly understood if 1 had given tliem sep- denudatus, as variety denudatus, I thought it best to make no 



arate specific names and called them respectively PL denu- alterations in the nomenclature used in the text, p 65. 



