. The annals and magazine of natural history : zoology, botany, and geology. ue. The tongue varies much in size : it may nearly cover thefloor of the mouth or its width may be only about one-thirdthat of the latter. Bedriaga f has alrtady mentioned thatthe posterior processes .also vary much in length according- * Herpetologia Europaea, 2ud ed. (1912),—So much in tliis book ismerely careless compiiatiun that 1 need not further allude to it exceptto express amazement at the sugoestiou there made that the Spanisli-Portuguese frogs named vars. Jigpanica and perezi may be the same asthe var. Iesso
. The annals and magazine of natural history : zoology, botany, and geology. ue. The tongue varies much in size : it may nearly cover thefloor of the mouth or its width may be only about one-thirdthat of the latter. Bedriaga f has alrtady mentioned thatthe posterior processes .also vary much in length according- * Herpetologia Europaea, 2ud ed. (1912),—So much in tliis book ismerely careless compiiatiun that 1 need not further allude to it exceptto express amazement at the sugoestiou there made that the Spanisli-Portuguese frogs named vars. Jigpanica and perezi may be the same asthe var. Iesso7ue; also at reading that the males ot JL yrtccu andIt. ibertca are distinguished from those of allied species in havingexternal vocal sacs. t Lurchlauna Euronas, i. p. 36 (181)1). 19* 244 Mr. G. A. Bouleiifrer on the Races and to individuals ; this is well shown by two specimens fromFlorence, representing the two extremes. A more or lessdistinct process between the two horns is sometimes present,as in a specimen ot the var. lessome from Noville, Switzer-land *. Fig. Showing the shape of the tongue in specimens from Berlin, var. ridibunda (a, b), Florence, f. tyjjica (c, d), and Novilie, var. leasonce (e). The Head. According to Bolkay f, the three forms distinguished byhim as species differ in the following points:— R. esculenta. Head comparatively narrow, tip of snoutending in a blunt point ; interorbital space equal to half, orfrequently to three-quarters, the breadth of the upper eyelid. R. ridibunda. Head broad, short, tip of snout bluntlyrounded ; interorbital space equal to one-third the breadth ofthe upper eyelid. R. chinensis. Head narrow, long, and very pointed at theend ; interorbital space equal to half the breadth of the uppereyelid. There is no constant difEerence in the shape of the headbetween the two first, and although it is a fact that R. chi-nensis usually has a narrower head and a more pointed snout, • This process is usually distinct in the India
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