102 STUDIES IN TASMAXIAN MAMMALS, LIVING AND EXTINCT, 



THE RADIUS AND ULNA. 



As neither radius nor ulna was: complete in N. 

 tasmanicum, no measurements could be supplied when the 

 monograph upon that animal was compiled. With N. 

 mitchelli, we get both bones from the right side, and a 

 perfect ulna from the left, the associated radius, however, 

 being distally imperfect. The left ulna is 437 mm. long, 

 the right being 436 mm. The right radius is 385 mm. 

 long. As both bones have been figured proximally (vide 

 plate 10, monograph N. fas.), it will be only necessary 

 to siay that distally the ulna ends in a perfectly round 

 head, 36 mm. in diameter, while the radius expands to a 

 transverse width of 80 mm., its proximal cup being only 

 50 mm. x 48 mm., which is exactly the same in iV. 

 tasmanicum. 



THE STERNUM. 



Four moieties of the sternum of N. mitchelli were 

 recovered with the other parts of the skeleton. These con- 

 sist of the manubrium, and three sternebrae of the 

 Gladiolus. Possibly two segments, and the ziphoid ele- 

 ment are missing. In articulating the skeleton of N. 

 tasmanicum, tern pairs* of ribs were carried to> the sternum, 

 seven of which were attached to the pre and meso-sternum. 

 This must be very close, if not actually, the condition that 

 really obtained in these animals, and, accordingly, two 

 sternebrae are missing from the mesosternum of N . mitchelli, 

 in addition to the met asternal element. The manubrium 

 is 100 mm. long, and 108 mm. wide; it is heavily keeled, 

 the carina ending in a tuberosity that projects outwards 

 for 45 mm. If this tuberosity is pressed against the ver- 

 tical plate of the measuring board the total thickness of 

 the bone is 71 mm. 



The sternebrae are furnished with nearly square bodies, 

 and expanded ends; the two perfect ones measure 75 mm. 

 and 74 mm. respectively, in total length, with a width of 

 40 mm. at the ends, sinking to a central width of 28 mm. 

 in vertical measurement, the transverse rim measurement 

 being 26 mm. Vertically, the surfaces are convex and 

 concave* — transversely concave — on either side. 



FEMUR. 



The feimur closely simulates that of the Leptncerathine 

 group* (as duly figured in plate No. eleven of the mono- 

 graph of N. tas.), but is larger, as the appended table will 

 show. Being a younger animal, the muscular surfaces are 

 less strongly marked; indeed, the femur, as a whole, is a 

 smooth one, as indicates the age stated. 



