[24 



NOTE ON an i:\ i [NOT BAGLB, 



genera it differs as follows ; The "neck " being Longer the proxi- 

 mal end »>t" the shaft is in oonsequenoe notably broader the Deck 

 itself is also broader in the opposite direction between the head 

 ami the trochanter, The entoanconal surface of the upper pari of 

 the shaft as tar as the extensor cruris ridge 

 is muoh flattened, and between the head 

 and the pneumatic foramen becomes eon- 

 oave. The pneumatic foramen is remark- 

 ably small, about half its oustomary Bize in 

 leoent genera, and is partially conoealed by 

 a. defleotion of the sharp edge of the trc* 

 ohanterian ridge. When the bone rests on 

 its outer side the flattening iA' the anoonal 

 surface proximally and ^^ the palmar dis- 

 tally brings into prominence the pectineal 

 ridge, which thus forms a high and sharp 

 inner margin; this ridge is continuous from 

 the entepioondyle to within a short distanoe 

 from the head, where it ends in a distinct 

 tubercle representing a third trochanter, a 

 feature rarely occurring in the femora oi 

 lards. The extensor cruris ridge desoends 

 much further on the anoonal Burface than 

 in existing genera o( the family. On the 

 palmar surface the linea aspera commencing 



low down as a faint ridge enlarges into a 



well marked eminence opposite the interval 



between the end <^' the pectineal ridge and 



the medullary orifioe, sending off b short 



branch towards the latter, and continuing its main course upwards 



with a Btrong ourve towards the palmar end o( the musoular area 



oi the trochanter, The pit above the entepioondyle absent in 



llal'utctus and llaliastur is in the fossil situated in the mouth of 



the groove between the condyle and epioondyle. 



The characters of the genUS are for the present but the leading 



characters of the femur. 



