MUE.^NOSAUEUS DUEOBEIVENSIS, ^ 133 



Femur: length 35-7 



diameter of head (crushed) 7*5 



least antero-posterior diameter of shaft 6-7 



width of distal end . 16-4 



Tibia : width 9-2 



length 7'3 



Fibula: width 8-4 



length . (approx.) 6'7 



B. 2427 (Leeds Coll. 27). Portions of the skeleton of a rather small individual, probably of tbis 

 species. The ossification is complete, although the animal is smaller than tbe type 

 specimen (R. 2428) or than R. 2863. The parts preserved are basioccipital and basi- 

 sphenoid, exoccipitals, premaxilla; parts oi: mandible including the symphysial region; 

 the atlas and axis, and thirty-six other cervical vertebrte, the fused neural arches and 

 cervical ribs being broken away in nearly all cases ; eleven dorsal and thirteen caudal 

 vertebrse, some with the arches and ribs ; numerous ribs, dorsal and ventral, chevrons ; 

 imperfect shoulder-girdle, ischium, (?) femur, tibia, and fibula. 



As already mentioned, although the ossification in this specimen is far advanced, the 

 neural arches, the cervical and caudal ribs being fused with the centra, and the coraco- 

 scapular foramen completely closed by the median junction of the coracoids and the 

 ventral bar of the scapula?, nevertheless it is smaller than the type spscimen, in which 

 none of these indications of maturity are present : it is possible that this difference in 

 size may be a sexual one, but the evidence is not sufficient to make this certain. In this 

 specimen the caudal vertebrse and chevrons are well preserved : these show that on the 

 anterior caudal region the chevron-facets are single and confined to the posterior border 

 of the centrum, where they maybe raised on a well-marked prominence. Further back 

 the chevrons bear two facets, which in some cases may be almost completely separated 

 from one another ; in this case they articulate between the centra of two successive 

 vertebras, which bear corresponding oblique facets both on their anterior and posterior 

 borders. The chevrons of opposite sides did not unite ventrally. 



The dimensions (in centimetres) of this specimen are : — 



Basioccipital : transverse diameter of occipital condyle . . . 2'5 



vertical diameter of occipital condyle , . . . 2'6 



greatest length in middle line 4"1 



,, width at lateral processes 5'2 



Mandible : length of symphysis 4-0 



„ postarticular process 3-7 



width of surface for articulation with quadrate . 2'5 



I 



V tph !P Atlas and First Tenth Twentieth Thirtieth Anterior Middle „ , Anterior Midtlle 



^' axis. ceryical. ccrviciil. cervical, cervical, dorsal, dorsal. ficra . gaudals. caudal. 



Length of centrum in 



mid-ventral line . 5-5 2-8 4-2 5-2 5-3 5-3 5-7 5-0 4-2 3-8 3-0 



Width of posterior 



face of centrum . 3-3 (crushed) 3-6 4-6 6-1 6-6 6-3 6-7app. 6-1 5-4 5-3 4-2 



Height of posterior . 



face of centrum ... . . 3-7 4-8 5-2 .5-6 6-2 5-0 4-5 4-5 3-6 



The numbers of the cervicals in the series are only approximate. 



