26 BECORDS OF THE AUSTRALIAN MUSEUM. 



collection, but broken off short at the point of their enlargement 

 from the neural spine. The latter extends one and three-quarters 

 of an inch from the roof of the neural canal upwards, and is five- 

 eights of an inch in fore and aft measurement immediately above 

 the zygopophyses, linear oval in section, and very sharp along 

 the anterior and posterior edges ; anteriorly this sharp edge is 

 continued downwards over the neurapophysial surface as a similar 

 ridge to between the prezygopophyses, and is but shallowly exca- 

 vated, much less than in C cantabridgiensis, nor anything as 

 much inclined as in C. valdensis, or the extreme condition of the 

 spine in C. etirymerus, but seems to approach nearest to that of 

 C. Ihnnophilus. The neural canal is large and subquadrate, pro- 

 portionately larger in fact than appears to be general in this 

 genus, even more so than in C. limnophilus. 



The ribs are so reduced by fracture that it is almost impossible 

 to afford precise details about them, but the majority appear to 

 have been irregularly oval in cross-section, flattened on the 

 sides. The costal articulations on the centra are invariably 

 single. 



A small portion of bone is figured (PI. vii.. Fig. 2) under the 

 belief that it may be the expanded distal end of a short or cervical 

 rib, forming one of the " hatchet bones." Notwithstanding its 

 incompleteness, I believe this to be the nature of the specimen. 

 The body is angular on the inner or hsemal surface, and flattened 

 on the outer ; the anterior extension is shorter than the posterior, 

 itself abbreviated and thick. In PI. vii., Fig. 4, is probably re- 

 presented the distal end of one of the trunk ribs, broken at the 

 apex. 



Several interesting fragments are present, similar to PI. vi., 

 Fig. 5. I labour under the impression that these may be 

 the expanded distal ends of the diapophyses of the dorsal vertebrae. 

 They possess a distinct oblique convex articular facet, bounded by 

 a slightly elevated ridge. Such portions of the shafts as remain 

 are compressed between dorsal and ventral, and are angular trans- 

 versely, i.e., fore and aft. PI. vii.. Pig. 3, is another diapophysis, 

 possibly one of the anterior with a portion of the sides of the 

 neural arch remaining attached. It will be seen that the articular 

 surface is much longer and more oblique in the former specimen. 

 These diapophyses seem to have some points in common with those 

 of Mauisa7irus haastii, Hector,* although much shorter, still 

 this may be only the result of position in the series. At the 

 same time it is strange that not a distinguishable fragment of a 

 dorsal vertebra, other than these processes, has occurred with the 

 remains of this interesting reptile. 



* Trans. N. Zealand Inst, vi., 1874, p. 347. 



