44 INTESTINE AND DIET OF REPTILES. 



midopltorus sexlineatus shows about the same relative mea- 

 surements as the slender (arboreal) Agamoids or still better 

 the Lacertids, as will be seen låter. With the latter it also 

 agrees better in shape so that the measurements become still 

 more comparable. Ameiva ameiva which also eats molluscs 

 has the small intestine a little longer. Cnemidophorus mu- 

 rinus again, the diet of which is to a great extent herbivorous, 

 has got the small as well as large, intestine considerably en- 

 larged to resp. 167 and 46 % of the standard. These iigures 

 agree as near as can be desired with the corresponding ones 

 for Lacerta galloti namely resp. 163 and 42 % which lizard 

 also has a mixed herbivorous diet. On the other hand the 

 percentages agree for the wholly insectivorus L. muralis 

 and viridis very well with the corresponding ones for Cne- 

 midophorus sexlineatus. The Scincoids which are not too slen- 

 der and snake-like in appearance, as for instance Chalcides 

 iineatits, but have a more typical lizard-shape agree very 

 well with regard to the relative measurements of their in- 

 testine with the other insectivorous lizards. The snake-like 

 lizards of diflPerent families as Delma, Ophisaurus, Chalcides 

 lineatus etc. have of course, when compared with the body- 

 length, a shorter intestine than the others so that the percen- 

 tae-e for the small intestine varies from 41 — 51. In PJii- 

 neura the whole intestine is only 38 % of the length of 

 head and body so it seems shorter than in all others, but 

 this lizard has also the most slender wormlike shape of 

 all the measured ones. With due regard to the variability 

 of aberrant forms in which the dimensions of the body cause 

 a different result it may thus be established as a rule that 

 in insectivorous lizards of the typical shape the length of 

 the small intestine usually measures about 92 % of the length 

 of head and body (very seldom less than 73 or more than 

 114) and the large intestine aliout 32 % of the same standard 

 (seldom less than 25 or more than 39).^ Carnivorous lizards 

 as Varanus, seem to exceed these relative measurements a 

 little, especially with regard to the large intestine, but my 

 material is rather scanty. When on the other hand some 

 Tejids and Lacertids acquire the habit of living on a mixed 



* If not only the length, but the bulk could be considered I think that 

 such a lizard as Phrynosoma would be found to have similar relations as 

 these between intestine aud body (conf. the notc above). 



