SHUKEi.irr : Osteoi.ocv oi' thk Herodionf.s. 



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also smooth in front, and does not descend as low as either of the 

 others. Hetween this one and the next the usual foramen pierces the 

 bone, low down n the groove between them. 



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Fig. 2iZ- Left tliree-(|uartering view of the fuicula of Nycticorax violaceus. 

 adult. ) 



Fig. 34. Same view of the os fitrcula of Ardea caniiidissiiiin. Both natural size 

 from the specimens. 



It will be seen that these trochlea are so placed as to be slightly 

 conve.K forwards, and in a less degree concave behind, where they 

 come up to nearly the same points on the shaft, the middle one being 

 rather the lowest. Moreover, the mesial grooves that mark them are 

 here carried up to their very terminations. This posterior aspect of 

 the distal extremity also shows the foramen for the anterior tibial artery 

 in full view. Above these trochlear, and to the inner side, the cir- 

 cular facet for the first metatarsal is found. 



These three long bones of the pelvic extremity of Ardea Jierodias 

 have the following measurements in the adult : the femur, measured 

 from the highest point on the trochanterian ridge to the lowest point 

 on the outer condyle, is 10.5 cm. long, the tibia, 24.5 cm. and 

 the tarso-metatarsus, 17.8 cm. long, measuring from the highest 

 point on the intercondyloid tubercle to the lowest point on the middle 

 trochlea. We may add here that the length of the fibula which is but 

 9 cm., being one and a half centimeters shorter than the femur, and 

 fifteen and a half shorter than the tjbia. 



The first metatarsal is a free bone, with a peg-like shaft and exlarged 

 lower extremity. It is enlarged at its proximal end where it sup- 



