26 Records of the Indian Museum. [Voi,. XX, 



different a tadpole. According to the principles that have guided 

 me in the classification, R. cancrivora should be regarded as derived 

 from R. tigrina and as leading to R. iimnocharis, with which it agrees 

 in the larval condition, more of the normal type prevailing in the 

 genus Rana. 



I conclude that the differentiation of the tadpole in the two 

 species has arisen independent!}- from that of the adult, and can- 

 not therefore accept the suggestion made by Annandale that the 

 case in question points to forms originally distinct having con- 

 verged to resemble each other in the adult condition. My opinion 

 is supported by various examples grouped by Giard under the 

 term poecilogony.' 



6. Rana verrucosa. 



Rana verrucosa. Giinth., Proc. Zool. Soc. 1875, p. 567 ; Bouleng., Cat. Batr. 

 Ecatid., p. 29, pi. iv, fig. i {iHz), and Faun, hid., Rept,, p. 448 (1890) ; 

 Boettg., Ber. Offenb. Ver. Nat. 1892, p. 94; Annand., Rec. hid. Mns. 

 XV', 1918, p. 17, pi. i, fig. I. 



Vomerine teeth in strong oblique series, touching the anterior 

 borders of the choanae or narrowly separated from them. 



Head a little broader than long, moderately depressed ; snout 

 obtuseh' pointed, feebly projecting beyond the mouth, as long as 

 the eye ; canthus rostralis obtuse ; loreal region very oblique, con- 

 cave; nostril equidistant from the eye and the tip of the snout or a 

 little nearer the latter ; the distance between the nostrils greater 

 than the interorbital width, which is le^s than that of the upper 

 eyelid ; tympanum very distinct, | to f the diameter of eye and 

 about twice its distance from the latter. 



Fingers obtuselj^ pointed, firit longer than the second, third as 

 long as the snout or a little longer or a little shorter; subarticular 

 tubercles large and very prominent. 



Hind limb rather long, the tibio-tarsal articulation reaching 

 the nostril or the tip of the snout, the heels strongly overlapping 

 when the limbs are folded at right angles to the body ; tibia 3J to 

 4 times as long as broad, if to 1^% times in length from snout to 

 vent, as long as or slightly shorter than the foot or the fore limb. 

 Toes obtusely pointed or slightly swollen at the end, f to f webbed, 

 two phalanges of fourth free ; outer metatarsals separated nearly 

 to the base ; subarticular tubercles rather small but very promi- 

 nent ; tarsal fold reduced to the distal half ; inner metatarsal tubercle 

 elliptical, rather compressed, ^ to ^ the length of the inner toe; 

 a small outer metatarsal tubercle. 



Head and back rough with warts of unequal size, some of 

 which may form curved folds on the anterior half of the back ; 

 sometimes a rather indistinct fold across the head, behind the 

 eyes ; a strong, curved glandular fold from the eye to the shoulder. 

 Ivower parts smooth, granulate under the thighs near the vent. 



I Cf. Boulenger, Rec. hid. Mus. XV, 1918, p. 65, and C.R. Ac. Sc. Paris, 

 CLX\"I1, igiS. p. 60. 



