Paekee. — On Notornis mantelli. 257 



DESCEIPTION OF PLATES XIX— XXI. 



Plate XIX. 



Fig. 1. The Te Anau skeleton of Notornis mantelli, from the ventral aspect (J nat. size). 



Fig- 2. ,, „ „ „ „ „ from the right side ( „ „ )• 



(Figs. 1 and 2 from photographs by Burton Bros., Dunedin.) 



Plate XX. 



Fig. 3. Comparative views of the trunk skeleton of 



A. Notornis mantelli. 



B. Tribonyx gouldi. 



C. Ocydromus australis. 



D. Porphyria melanotus. 



All drawn to the same absolute length. 



xy, line drawn through anterior boundary of trunk. 



x'y' „ ,, „ posterior „ ,, „ 



x"y" ,, ,, ,, anterior end of pelvis of Notornis. 



x"'y"' „ „ „ acetabulum of Notornis. 



ac, acetabulum. k, keel of sternum. 



a. tr, anti-trochanter. m.x.p, middle xiphoid process. 



cl, clavicle. ob, obturator notch. 



cr, coracoid. pu, pubis. 



cv.r, last cervical rib. sc, scapula. 



e.x.p, external xiphoid process. th.r.l, first thoracic rib. 



il, ilium (prse-acetabular portion). th.r.8 {th.r.9 in B.), last thoracic rib. 



it', „ (post-acetabular portion). uc.p, uncinate process. 



il. sc, ilio-sciatic foramen. vc, vertebral column, 



is, ischium. 



Plate XXI. 



Fig. 4. Outline of sternum and coracoids of Notornis (even line), with the same parts 



in Ocydromus superposed on the left side (dotted line), and those of Porphyria 



on the right (broken line). For reference letters see under 4a. 



Fig. 4a. Outlines of right half of sternum and coracoids of Notornis (even line) and 



Trihonyx (dotted line). 



All drawn to a common length of sternum, and viewed from the ventral aspect. 



xy, long axis of sternum. 



cr, coracoid. k, k', k", k'", anterior end of keel of sternum. 



cp, costal process {Notornis). e.x.p., e.x.p'., e.x.p"., e.x.p'"., external xiphoid 



process. 



cp' „ ,, {Ocydrovius). m.x.p., m.x.p'., m.x.p"., m.x.p'". ,miAdlexiTph.o\dL 



process. 



cp" „ „ {Porphyria), r, rostrum or manubrium {Porphyria). 



cp'" „ „ {Tribonyx). r', „ „ „ {Tribonyx). 



Fig. 5. Transverse sections of sternum of 



A. Ocydromus, 



B. Notornis. 



C. 'Tribonyx. 



D. Porphyria. 



All two-thirds natural size. 



k, keel of sternum, 

 25 



