VARIATION NOTES. 



229 



Fir,. 2. Ventral surface of a Xiphorhamphus jenvnsh with an adventitious ventral. 



I'li;. 3. The innominate bones of a normal Xiphorhamphtts. 



FIG. 4. The innominate bones of the specimen figured in 2. 



FIG. 5. Left innominate and adventitious innominate from the 'eft. 



