. Evolution and its relation to religious thought . late we give onlyselected stages, but in the fuller plates of the memoir^and still more in the shells themselves, the subtilest gra-dations are found. This case is striking, partly because it is a very favor-able one, but mainly because it has been so carefullystudied. There can be no doubt that equally carefulstudy would reveal the same transition in many othercases. Nor are such transitions confined to the lowerforms of life, though they are probably more abundantthere. According to Cope, the nicest gradations may betraced between some of t
. Evolution and its relation to religious thought . late we give onlyselected stages, but in the fuller plates of the memoir^and still more in the shells themselves, the subtilest gra-dations are found. This case is striking, partly because it is a very favor-able one, but mainly because it has been so carefullystudied. There can be no doubt that equally carefulstudy would reveal the same transition in many othercases. Nor are such transitions confined to the lowerforms of life, though they are probably more abundantthere. According to Cope, the nicest gradations may betraced between some of the extinct mammalian speciesso abundant in the Tertiary deposits of the West—espe- 238 EVIDENCES OF THE TRUTH OF Fig. YO.—Transformations of Planorbis (after Hyatt). Soies IV. 1, PI. levis: Undorf. 2, PI. Steinheimensis ; 3, tenuis-Stein- heimensis; 4, tenuis; 5, discoicieus ; 6, trochiformis-discoideus; 7, trochiformis: III. 8, PI. levis: Undorf. 9, PI. oxystomus; 10, suprcmus; 11, supremus var. turrita : II. 12, PI. levis: Undorf, 13, ; 14, 15, cres- cens: I. Sub-series 3. 16, PI. levis: Undorf. 17, PI. minutus-levis; PROOFS FROM ARTIFICIAL PRODUCTION. 239 18, minutus; 19, 20, triquetrus: Steinheira. Sub-series 2. 21, ; 22, 28, denudatus-minutus ; 24, denudatus var. distortus:Steinheim. Sub-scries 1. 25, PI. costatus-minutus ; 26, costatus ;27, 28, costatus var — : specimens from Undorf all belong to an older Tertiary period thanthat at Steinheim. cially between the species of the extinct generalized fam-ily of Oredontidce.^ The same is probably true of themany extinct species of the horse family
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