760 



majority of the cases recorded are those in which an extra hind limb or 

 pair of hind limbs is present. The following is a brief resumé of those 

 in which the extra limbs are arms or j)airs of arms. 



Superville in 1740 (11) described a case in which there was an 

 extra fore limb attached to the right shoulder, but he gives non further 

 details. 



In 1864 Gervais (7) gave a description of a specimen of Felobafes 

 cultripes in which there was a second left arm attached behind the nor- 

 mal one. It had a separate coracoid and scapula, a humerus and a radio- 

 ulna which were fairly normal and three digits of which the two lateral 

 were rudimentary with but one phalanx each. 



The Royal College of Surgeons (4) in 1872 catalogued a specimen 

 of a frog with a extra fore limb attached to the sternum but gave no 

 more details. 



Lu nel in 1868 (9) recorded an example of Bana viridis in which 

 there was a supernumary pair of anterior limbs on the left side. The 

 pair were fairly normal and had a scapula each. 



A somewhat similar example w^as described by Mazza in 1888 (10) 

 in Rana esamelica. Here again an additional pair of arms followed the 

 normal limb on the left side and was attached to a separate shoulder 

 girdle formed by a single scapular and double coracoid portions. 



Bland Sutton (3) in 1889 cited a case oi Rana temporaria with 

 an accessory fore limb on the left side. It had three digits and was 

 attached to the left half of the shoulder girdle by means of a piece of 

 bone resembling a supernumary coracoid. 



In the same year Bergend al (2) gave a full and detailed descrip- 

 tion of a specimen of a Rana temporaria with a third fore limb on the 

 left side. It has only two digits but a fairly normal humerus and radio- 

 ulna with a fairly complete muscle supply. The humerus runs forward 

 under the skin of the floor of the mouth from the dorsal side of the 

 coracoid with which it does not appear to articulate and the remaining 

 part of the limb comes through the skin and projects backwards. 



Washburn (12) in 1899 noticed a toad, Buffo columbiensis, with 

 an extra arm just in front of the left normal one. The hand is supplied 

 with seven digits and it is stated that the radius and ulna are not fused 

 but separate bones. From the diagram however it would seem that, this 

 appearance is better interpreted as a double radio-ulna and a double 

 hand so that the limb in all probability represents parts of a fused pair. 



In 1901 Johnson (8) recorded two instances of polymely: viz. a 

 specimen of Rana palmipes^ in w'hich there was a pair of supernumary 

 limbs arising one from each normal scapular region, the left was fairly 

 normal but small while the right had previously been cut off; and a 



