BIHANG TILL K. SV. YET.-AKAD. IIANDL. BAND 28. AFD. IV. N:o 8. 23 



by 17 in width. The interiör siirface of tlie small intestine 

 displays a great number of small, long-itudinal ridges, which 

 are finely and irregularly wavy. To\yards the duodenal tract 

 these ridges are more strongly developed and deserve the 

 Tiame of folds. In the neighboiirhood of the ileocoecal opening 

 there is also a system of transverse rngosities which cross 

 the others at right angles. Next to the said opening the 

 transverse ones become much the strongest. The ileocoecal 

 valve is little developed. The appearance of the large inte- 

 stine and ca^cum is very striking when compared with the 

 same of Conolophus, Brachylophns and Igiiana. These parts 

 are uamely not at all sacklike or greatly expanded in this 

 lizard as in the three others, but have an almost uniform width 

 all the wa}' from the eoeeum to the rectum. This difference 

 in appearance depends npon difference in strncture. The co- 

 lon of Amhlyrhiinclms is namely not provided with a small 

 number of large valves each of which forces the colon when 

 charged with foodmaterial to expand to a wide cavity. In- 

 stead of such an arrangement it shows a very great number 

 of small transversal folds somewhat irregularly placed, but 

 as a rule most strongly developed on the mesenteric sida 

 (Fig. 6, Pl. I). They measure from one to three millimetres 

 in height and sit at a distance from each other varying from 

 IV 2 to 4 mm. Towards the rectum they decrease in size, 

 but are still fully developed at a distance of 23 cm. from the 

 coecum, but even in the rectum transversal plicfe can be quite 

 plainly distinguished. It may be concluded from this descrip- 

 tion that the colon of the Ämblyrliynclms greatly difFers from 

 that of the other above mentioned Iguanids. It is also quite 

 evident that such a structure as that found in the colon of 

 Amhlyrhynclms cannot retard the passage of the food in such 

 a mauner as the large valves in the large intestine of the 

 three herbivorous Iguanids described above. The digestion 

 m.ust accordingly take place after another plan, so to say. It 

 seems, hoAvever, to be rather thorough. In the ventricle are 

 found as is already stated large pieces of algse, which are 

 in such a state that my friend Professor Kjellman could on the 

 microscopical structure recognize pieces of a Laminaria and of 

 red algcB as he has kindly told me. It does not seem impossible 

 that these after having been softened become squeezed and 

 crushed when passing the strongly muscular pyloric tract. 



