230 



COMPAE ATI Y 1 1 A N ATOMY. 



to a certain extent, the more one is developed, the less important 

 is the other. 



.st 



FIG. 187. AU.MENTAUY YISIT.KA AMI A in- Hi, ADDER OF Lcpidosteus, in situ. 



(After Ball'our ami 1'aikrr.) 



, anus; a.b, air-bladder; a. A 1 , its aperture into tin- throat; b.d 1 , aperture of bile- 

 duct into intestinr ; c, pyloric cu-ca : </.l>. uall-liladili-r ; hp.d, hepatic duct; Ir, 

 liver ; py, pyloric valve : 5, spleen ; xp.r, spiral valve ; st, stomach. 



In the narrow-bodied Gyrnnophiona, the intestine is only 

 slightly coiled, while in Anura it becomes considerably folded 

 on itself. Its form in Salamanders is about mid-way between 

 these two extremes. 



