AXIAL SKELETON OF THE PELECANIDA. 
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. 
377 
Fig. 46. Twenty-first, twenty-second, twenty-third, and twenty-fourth vertebre 
together, seen ventrally. 
Fig. 47. Caudal vertebrz and pygostyle. 
(In Plates LIX., LX., & LXI., the following letters have throughout the 
meanings here given,) 
a. Sternal angle postaxial to pleurosteon (Plotug). 
at. Antitrochanterie process. 
ec. Coracoid groove of sternum. 
ca. Costal angle of sternum. 
el. Root of fureulum. 
f. Lateral acetabular fossa, 
f'. Supraacetabular fossa (Pelecanus). 
g- Groove on ventral surface of ischinm. 
gl. Gluteal ridge. 
h. Surface for head of rib. 
i. Ischium. 
al. Lium. 
al’. Postacetabular part of ilium. 
k. Keel of sternum. 
Ze. Mlio-caudal spine. 
Zp. Tlio-pectineal eminence. 
lr. Hadge postaxial to posttrochanteric process (Plotus). 
lz. Lateral xiphoid. 
mx. Median xiphoid. 
p- Pubis. 
ps. Ventral process of ischium. 
a Sacral foramina. 
st. Posttrochanteric process. 
t. Surface for tubercle of rib. 
