. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Variation of the Edibfa Frog. 255 European forms, the course I have followed is surely the belter from a philosophical point of view, whilst the use of a varietal designation precludes all fear of the distinction being- overlooked. The following diagram expresses the relationship between the five forms, as I conceive them :— Var. lessonte. Var. ehinensis. Var. Var. ridibunda. We cannot yet apply the tost of crossing experiments in justification of ihe subordinate po
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Variation of the Edibfa Frog. 255 European forms, the course I have followed is surely the belter from a philosophical point of view, whilst the use of a varietal designation precludes all fear of the distinction being- overlooked. The following diagram expresses the relationship between the five forms, as I conceive them :— Var. lessonte. Var. ehinensis. Var. Var. ridibunda. We cannot yet apply the tost of crossing experiments in justification of ihe subordinate position assigned to /?. ehinensis, as Pfluger was able, to do in the case of li. esculenta and its var. ridibunda, but another physiological argument has been put forward by Wolterstorff : the large and often sharp-edged metatarsal tubercle of li. ehinensis is an adaptation to burrowing habits unlike those of R. esculenta. We are told that Dr. Kreyenberg observed the Chinese frog to dig and retire deep into the ground of dried-up rice-fields, and this habit is regarded as an important etiological differentiation from its European representatives. Curiously, however, Fejervary very shortly after redescribed the var. lessonce under the name of , from specimens living in marshes at the mouth of the Rhone in Switzerland, and observed the behaviour of this frog on land to be different from that of the typical li. esculenta, the large and somewhat movable metatarsal tubercle being used to burrow in the ground after the manner of Pelobates. It is interesting to note, in this connection, that Wolterstorff, who (1906) seemed to attach so great an importance to this peculiarity in the case of the Chinese frog, had (1U04) only reluctantly recognised li. lessona's rank as a variety, a term which for him expresses mere individual variations, such as his colour- simple variety de liana esculenta, L., a cles caracteres propres et con- stants qui lui meritent une description partic
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