130 The Alligator and Its Allies 
Ilio-ischio-caudalis (Plate III., Figs. 1 and 2, is. 
cd., Plate IV., Figs. 1 and 2, is. cd.) (Ischio- 
coccygeus). The crocodile is the nearest to the 
typical condition in the musculature of the tail. 
The lateral and ventral part of the tail muscula- 
ture forms a broad mass that extends to the end 
of the tail; it lies immediately under the skin and 
springs from the caudal ribs (transverse processes 
—Gadow) and from the spinous processes of all the 
caudal vertebre. The entire side musculature of 
the tail ends cephalad in several portions; the most 
ventral and medial of these bound the cloaca as an 
at least slightly developed, morphological sphinc- 
ter; the lateral portion is attached to the pos- 
teroventral border of the ischium; while the 
dorsal portion is inserted by two heads on the first 
caudal rib and on the posterior spine of the ilium. 
