1895.] BATRACHIANS FEOM ADEN, 663 



the eye and the spiraculum, and one half the diameter of the eye 

 more than the distance between the nostril and the eye. Eyes 

 placed on the upper surface of the head rather widely apart, the 

 interval between them equalling their distance from the snout and 

 falling short of that between them and the spiraculum. The spira- 

 culum is placed slightly anterior to the middle line of the body, 

 and is directed straightly backwards, and is visible only from above. 

 The anus is median in position. The tail is about four times as 

 long as deep, and is pointed at its tip. The caudal crests are of 

 nearly equal breadth and parallel to one another. The depth of 

 the muscular part of the base of the tail is about one sixth the 

 length of the organ. 



Beak with a narrow black margin along the edge of each section, 

 the lower section much smaller than the upper and almost wholly 

 hidden by it. Two upper rows of teeth, the innermost widely 

 interrupted in the middle, and the outer with a slight breach of 

 continuity, possibly due to an injury. Three unbroken rows of 

 lower teeth. A feeble ill-defined papillary fold at the side of the 

 mouth. Muciferous crypts not ^asible. 



Blackish above and partly so below. Sides of tail pale greyish 

 yellow, finely marked with black pigment, darkest along the base of 

 the dorsal crest. In another and younger specimen the body and 

 tail are blackish brown, and the caudal crest is yellowish with fine 

 black-pigment spots here and there. 



Measurements of tadpole : — Total length 14 ; tail 19 ; breadth 

 of body 19 ; depth of tail 4-5. 



This tadpole is intermediate in character between the tadpoles 

 of B. viridis and B. vvlgaris, but it more resembles the latter than 

 the former in the shape of its caudal crests, which are, however, 

 less developed than in B. vulgaris. The tail in its more pointed 

 character difEers from both, but the specimen is not in a good state 

 of preservation. 



EXPLANATION OF THE PLATES. 



Plate XXXVI. 



Fig. 1. Eemidactylus yerhurii (nat. size), p. 640. 

 la. Under surface of fingers, enlarged. 

 Ih. ,, ,, „ toes „ 



1 c. Chin-shields. 

 1 d. View of upper surface of snout, enlarged. 



1 e. Tubercles of back, enlarged. 



Fig. 2. Mahuia tessellata (nat. size), p. 649. 



2 a. Enlarged view of dorsal scales. 



Fig. 3. Tarbophis guentheri (nat. size), upper view of head, p. 666. 



3 a. Side view of head. 



Plate XXXVII. 



Fig. 1. Latastia neumanni, Matschie (nat. size), p. 643. 



1 a. Scales of upper surface of body, enlarged view. 

 Fig. 2. Bona cyanophlyctis, Schneider ; tadpole (nat. size), p. 660. 



2a, Mouth; enlarged. 

 Fig. 3. Bufo andersoni, Boulenger ; tadpole, (nat. size), p. 662, 



3 (T. Mouth, enlarged, 



