116 Iluene and Lull — Triassic Reptile IfaMqpus. 



cannot imagine that what Marsh took for the ischium can really 

 be that bone. It is too long for a plate-like ischium, and a dis- 

 tally expanded ischium tog-ether with rod-like pubes would be too 

 peculiar and without parallel among other reptiles. Therefore 

 we take the two rod-like but proximally expanded bones as ischia 

 and the broad bone as the pubis with complete distal but imper- 

 fect proximal extremity. The distal end of the pubis is ob- 

 liquely broadened and thicker than the other parts of the bone. 

 The proximal end is broken off in an oblique line through the 

 middle of the obturator foramen. 



Length of pubis 32 mm 



Width in the middle . . . . 11 



Length of distal border . 16 



The ischium is very slender and of oval section; near the 

 proximal end it becomes a little broader and in the last (proxi- 

 mal) 10 mm it is curved and slightly expanded. Both ischium 

 and pubis are hollow. 



Length of ischium _ _ 49mm 



Its diameter at distal end . _ 3 



Its diameter near proximal end . . 4 



Its diameter at proximal end ..' 7 



Femur. — The right femur is a strongly built but quite hol- 

 low bone, curved in the upper third. The proximal extremity 

 is broken off, but it still shows the beginning of the high 

 trochanter major. The trochanter quartus is not visible. In 

 the smaller slab the bone shows its posterior, in the greater its 

 anterior aspect. The condyles at the distal end (the end Marsh 

 figured as the proximal one) are small. 



Length of femur 7l rari 



Diameter in the middle 7-S 



Longest diameter at the proximal end 12'5 



Tibia. — Both tibiae are preserved. In the left one the prox- 

 imal end is missing, the right one is complete and still in con- 

 nection with the other bones, but lying beside the right femur. 

 It is very slender and quite as hollow as the femur. The prox- 

 imal end is anteriorly thickened and the articular face is prom- 

 inent backwards. The distal end is broadened and flattened 

 in a transverse direction. 



Length of tibia 97 mm 



Supero-posterior diameter at proximal end 12 



Diameter in the middle 7 



Antero-posterior diameter at distal end . _ 4-5 



Transverse diameter at distal end 9-10 



Fibula. — There is only the distal (following Marsh it would 

 be proximal) part of the left fibula lying beside the left crushed 

 tibia. It is very thin and the distal end only is a little enlarged. 

 The preserved length of it is 65 E 



mm 



