AXIAL SKELETON OE THE PELECANID^. 377 



Fig. 37. Eighteenth vertebra, seen laterally. 



Fig. 38. Eighteenth vertebra, seen ventrally. 



Fig. 39. Nineteenth vertebra, seen laterally. 



Fig. 40. Nineteenth vertebra, seen ventrally. 



Fig. 41. Twentieth vertebra, seen ventrally. 



Fig. 42. Twentieth vertebra, seen preaxially. 



Fig. 43. Twentieth vertebra, seen postaxially. 



Fig. 44. Twenty-second vertebra, seen postaxially. 



Fig. 45. Twenty-third vertebra, seen preaxially. 



Fig. 46. Twenty-first, twenty-second, twenty-third, and twenty-fourth vertebrse 



together, seen ventrally. 



Fig. 47. Caudal vertebrae and pygostyle. 



(In Plates LIX., LX., & LXI., the following letters ^^ave throughout the 



meanings here given,) 



a. Sternal angle postaxial to pleurosteon (Plotui). 



at. Antitrochanteric process. 



c. Coracoid groove of sternum. 



ca. Costal angle of sternum. 



el. Eoot of furculum. 



/. Lateral acetabular fossa. 



/'. Supraaeetabular foasa (Pelecanits). 



g. Groove on ventral surface of ischium. 



gl. Gluteal ridge. 



h. Surface for head of rib. 



i. Ischium. 



il. nium. 



it, Postacetabular part of ilium. 



k. Keel of sternum. 



le. Hio-caudal spine. 



Ij). nio-pectineal eminence. 



Ir. Ilidge postaxial to posttrochanteric process (Plotus). 



hx. Lateral xiphoid. 



nix. Median xiphoid. 



p. Pubis. 



■ps. Ventral process of ischium, 

 si. 



s^. S- Sacral foramina. 



St. Posttroehanterio process. 

 t. Surface for tubercle of rib. 



