THE FEMALE REPRODUCTIVE ORGANS 299 
occurring in the many genera of the order, but it may be 
said that here the pelvis is usually of a type rather 
higher in the scale than the other structural character- 
istics of the order would indicate. The outlet is more 
commonly ovate than rectangular, the ischia and ilia 
lie at a more marked angle to each other, and the true 
conjugate forms a lesser angle than is common in quad- 
rupeds. The sacroiliac joint is, in general, freely movable. 
The female insectivorous pelvis is relatively large, 
the sacroiliac junction usually being long and well knit 
while the pubes are slender, wide of angle as to their 
descending rami and there may be no symphysis, as in 
bats. Edentates have distinct bony unions of the ele- 
ments of the innominate bone and of this to the sacrum 
which increases in width downward permitting a long 
synostosis with ischia and pubes ; these joints are not 
movable. The pubes are slender and the symphysis 
short. The sacrosymphyseal angle is 80 degrees in the 
armadillo. The inlet is roughly triangular to almost 
round. Cetacea have no clearly developed pelvis, its 
place being represented by two long bones, larger in 
males, which seem to be the insertion of the genital 
erector muscles. There is no junction to form a pelvis 
nor is there an acetabulum. A pelvic box is absent in 
the Sirenia, but lateral processes from the lumbar verte- 
brae form a sort of ileum between which an ischium 
is located. 
Proboscidea have a massive pelvis lying vertical to 
the spine. The iliac alas are wide and deeply concave; 
the ischia are short, heavy and parallel to the ilia; the 
pubes are short and combined in a heav}^ symphysis ; the 
sacroiliac joint is short, heavy and slightly movable; 
the outlet is ovate. In one specimen examined the length 
was 4 feet, symphysis 18 inches, true conjugate 19 
inches, transverse diameter 17.5 inches ; crests of iliac 
were 28 inches long. 
