3JIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 2S. AFD. IT. N:0 8. 17 



Iguaua i g vana L. 



Distaace from snout to vent 255 mm. 



The ventricle is in its empt}- state cylindrical, provided 

 witli thick muscular walls and interiör longitudinal folds. 

 Its träns versal diameter is in this state not more than 12 mm. 

 which is less than a tenth of its length. The difference in 

 thickness of the walls of the ventricle and the duodenum, the 

 latter being very thinwalled, makes the difference between 

 these two regions well conspicuous, but there is also a py- 

 loric valve. By this latter the proper limit between ven- 

 tricle and intestine is defined, the thick muscular coat of the 

 former organ ceases, however, 2 cm. from the valve so tliat 

 there is a thinwalled pyloric tract of such a length. The 

 length of the small intestine is about 46 cm. Its mucosa is 

 at least posteriorly longitudinally plicated, but details are 

 not easily recognizable on old material. The ileum opens 

 into a capacious coecum extending 2 ^ '2 cm. beyond the opening 

 of the ileum and being nearly as wide. The coecum is con- 

 tinued in a, to begin with, still wider colon (Fig. 5, Pl. I). 

 About 45 mm. from ileum the width of the latter is dimi- 

 nished to 1\ 2 cm. but before this it is o\ 2 cm. broad. About 

 11^/2 cm. from the ileum the colon makes a sharp bending 

 upon itself and is there just at the bend drawn out in a 

 blind saeculus about 2^ 2 cm. across. The following portion 

 may be termed rectum and is narrow, longitudinally plicated 

 and with muscular walls. The total length of the large in- 

 testine is about 24 cm., the cloaca not counted. 



The opening of the ileum into the colon is narrowed and 

 can be shut by a valve protruding into the colon like a spout. 

 On both sides of this extends a low valve or fold across some 

 part of the large intestine limiting the same from. the coe- 

 cal säck although in some cases it is only little prominent 

 (Fig. 5). About 1 ^ 2 cm. from the ileal opening in the oppo- 

 site direction that is in the colon, there is a very large valve 

 extending all round like a diaphragma (Fig. 5, I). Its width 

 in radial direction is from IV2 to 2 cm. and it thus leaves 

 onh' a narrow circular opening in the middle. About 12 mm 

 from this one there is another valve (Fig. 5, II) not exten- 

 ding all round but semilunar in shape and at its broadest 



