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. 

 PL tT line k, figs. 1-4, 11. 

 PI. crescens, line i, figs. 10-14. 



PL oxystomus var. cocMeatus, line 1, figs. 4-11. 



PL supremus, line 1, figs. 12-14. 



PL discoideus, line g, figs. 1-9, li 1-10, i 5-9. 



PI- 'SJ&r line i, fig 1. 



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



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



. Formation m, Section 1. 



PI ox^M, ii„e jj^^ figg_ 10-14, p 6-14. 



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



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



PL swpremus var. turritus, line n, figs. 8-13, o 1. 



PL discoideus, line 1, figs. 15-17. 



PL trochiformis, line m, fig. 1. 



Plate IV. 



Magnified 8 diameters. 



Line a, figs. 1-7 PL m,inutus. 



Line b, figs. 1-4 PL minutus, 5-6, 9 PL triquetrus var. turbinatus, 7-8 PL *SS™ 



Line c, figs. 1-3 PL triquetrus, 4-5 PL "SS™ 6-9 PL "S?^^ 



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



Line e, figs. 1-5 PL denudatus, 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 coiled, 11, young stage of another 

 broken out. This, though not a distinct figure shows that the coiling is in the same plane in the 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 y&v. platystomus, 6-12 PL costatus (= major Hilg. pars.), var. obtuso-costatus, 

 much distorted. 



Line k, figs. 1-7 PI costatus var. obtuso-costatus (= PL major Hilg. pars.), 8 PL ^"SS! 



Plate V. 



• Magnified 5K diameters. 



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



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



Line c, figs. 1-6, PL ^^ 7 PL ^^ turretted variety. 



* The different forms of PI. denudalus, PI. costatus var. datus, PL distorttis, and PLplatystomus, but having neglected 



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



have been more clearly understood if I had given them 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. 



