130 The Alli<^ator and Its Allies 



Ilio-iscliio-caiidalis (Plate III,, Figs, i and 2, Is. 

 cd., Plate IV., Figs, i and 2, is. cd.) (Ischio- 

 coccygeus). The crocodile is the nearest to the 

 typical condition in the musculatiire 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 vertebrae. 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. 



