1905.] ABXORMAL RANTD LARV.E. 61 



the corresponding bone on the riglit. A distorteil fragment of 

 cartilage in the muscles of the belly near the inferior termination 

 of the left ilium represents the os pubis ; but I can find no trace of 

 the remainder of the pelvic girdle or of the skeleton of either leg. 



The skeleton in B seems to have been entirely cartilaginous and 

 is so distorted that no satisfactory account of it can be given. I 

 can find no trace of the pelvic girdle or the hind limbs. 



The fore limbs in A are well developed but not symmetrical. 

 The right hand, measured from the wrist to the tip of the 3rd 

 (morphologically the 4th) finger, is 17 mm. long; the left only 

 15 mm. Otherwise the limbs appear to be normal. The pectoral 

 girdle is naturally to a great extent cartilaginous. In abnormal 

 larvfe of the kind it is difficult to know what stage of development 

 to expect in any given organ or structure ; but, on the whole, I do 

 not think that this girdle is so advanced in development as the 

 condition of the arms and of the first seven vertebrae would lead 

 one to expect. It is quite symmetrical and not remarkable in any 

 other respect. 



In B the fore limbs lay on the chest beneath the skin, which 

 had ruptured in the region of either hand. I do not think that 

 the spiracle had persisted, and both of the apertures may have 

 been posthumous or of traumatic origin. The arms were readily 

 freed by cutting through the skin. The measurements of them 

 given above were taken after this had been done. Their bones 

 appear to be more fully ossified than those of the remainder of the 

 skeleton. 



To sum up :— These two tadpoles, evidently belonging to the 

 same species and possibly taken together, are abnormal in the 

 absence of the hind limbs and, in at least one case, in the partial 

 suppression, distortion, and asymmetry of the pelvic girdle. In the 

 same specimen there is a less remarkable deformity of the fore 

 limbs and the cranium is in an extremely piimitive condition. 



The drawings for the Plate have been prepared under my 

 supervision by Babu A. C. Chowdhary, to whose accuracy I am 

 indebted. No attempt has been made to depict the specimens in 

 a natural condition ; they are represented as they were found in 

 the Museum. The bodies are shrivelled and distorted, and 

 probably the fin-membranes, at any rate in B, were more 

 extensive dviring life. The ventral integument in this specimen 

 is torn, and I cannot locate the position of the vent with 

 certainty. 



EXPLANATIOX OF PLATE VI. 

 Abnormal larvae of Mana alticola. 



Figs. 1, 1 rt. A from the right side and belo"W. Natural size. 



Figs. 1 6, 1 (?. Cranium of A from above and below. Natural size. 



Fig. 1 e. 8th and 9th vertebra of A from above. X 4. 



Fig. If. Do. from left side, with left ilium in natural position. X 2. 



Fig. 1 f/. Do. from right side. X 4. 



Figs. 1 'h, IJ. Left ilium of A. X 2. 



Figs. 2,2 a. B from the right side and below. Natural size. 



Fig. 2 6. Arms of B dissected out. Natural size. 



