106 STUDIES IN TASMANIAN MAMMALS, LIVING AND EXTINCT, 



marked by an arrow in the picture is less strongly indi- 

 cated in the younger animal — presumably, this fossa re- 

 lated to the infra, spinalus, and teres muscles, and a second 

 groove may relate to the scapular dorsal artery. The 

 acromion process is 110 mm. wide, and is roughened for 

 the enormous deltoid muscle, that ascended the spine for 

 245 mm., in addition to involving the whole of the distal 

 end of the actual process. 



THE PELVIS. 



The pelvis of Nototherium tasmanicum has been duly 

 illustrated and described (plate 15, pages 34 and 35 mono- 

 graph), and this will serve the purpose! of a generic de- 

 scription, but the comparative study we had hoped for was 

 marred by the fragmentary character of the pelvis of 

 Nototherium mitchelli. As far as the specimens serve we 

 are safe in saying that the Megacerathine animal was 

 similar to that of the Leptocerathnie one in the pelvic re- 

 gions, and if a complete- set of measurements could be sup- 

 plied the former would be presumably somewhat, larger 

 than the latter. To avoid the necessity of reference, we 

 reproduce here the scale of sizes already published. 



PELVIS OF N. TASMANICUM. 



mm. 

 (1) — Total width across the slightly imperfect ilia = 702 



(2) — Greatest width of least mutilated ilium = 235 



(3) — From tuberosity of ischium to upper rim of 



ilium = 535 



(4) — -Width of pelvis across rims of the aeetabula = 422 

 (5) — Transverse measurement of inlet of pelvis ... = 172 

 In the pelvis of N. mitchelli the whole of the sacral 

 portion is torn away, and neither of the ilia is perfect. An 

 attempt to compare measurement No. 3 of thei above' table 

 gives 500 mm. for a slightly smaller portion than is pre- 

 sent in the pelvis of N. tasmanicum, thus suggesting a 

 rather larger pelvis as a whole. For articulation purposes 

 the pelvis of N . mitchelli has been now restored, and as so 

 outlined its greatest width across the ilia is (36in.) 915 

 mm. This may eventually prove to be too wide, but at 

 least 100 mm. in excess of that of N. tasmanicum is cer- 

 tainly within the mark. 



COMPARATIVE SKULLS OF NOTOTHERIA. 



At an earlier stage of this work we promised to give 

 a table of contrasting skull characters, and although in 

 part this has been supplied in drawing up the conspectus 



