BIHANQ TILL K. SV. VET.-AKAD. HANDL. BAND 28. AFD. IV. N:0 8. 41 



stated in the descriptive notes above that in some lizards, 

 for instance Phrynosonia, a quite well developed coecal diver- 

 ticle of the intestine is present at the pylorns. This has 

 thus the same situation as the appendices pyloricce of many 

 bony fishes. I think, however, that most authors will agree 

 with me that it would be rather presumptuous to homologize 

 the pyloric diverticle of the lizards with the pyloric appen- 

 dages of the bony nshes in spite of the corresponding situation. 

 The state of preservation of my material did not allow 

 any microscopical investigation of the finer structures of the 

 intestinal canal so I have to leave this chapter for the pre- 

 sent. There could, however, be observed some structural diffe- 

 rences as well in the ventricle as in the intestine. One of 

 the most important of these is no doubt the differentiation 

 of the pyloric tract. ^ As has been mentioned in the descrip- 

 tive notes above, many lizards have an intercalary thinwal- 

 led portion of the ventricle between the pyloric valve and 

 the strongly muscular main part of the ventricle. I have 

 observed this thinwalled pyloric tract in most of the large 

 and medium-sized lizards, and I think future investigations 

 will show that it is present, at least in a rudimentary state 

 in all or nearly all, and also that the structure with regard 

 to the glands of the two portions is diiferent. It has been 

 stated in a few lizards^ that fundus-glands and pylorus- 

 glands occupy difFerent regions of the ventricle. In Pseudo- 

 jnis apus for instance Oppel (1. c. p. 127 — 128) found the for- 

 mer distributed över an area nearly six times as long as 

 that occupied by the pylorus-glands. It seems probable to 

 me that the thinwalled pyloric tract which I have stated in 

 so many lizards corresponds to the region of the pylorus 

 glands and that the f un dus glands belong to the greater 

 muscular tract. The division of the ventricle of the lizards 

 into two diiferent regions the anterior of which is muscular 

 is of interest because it oiFers some points of comparison 

 with the wellknown condition found in the crocodiles. In 

 the latter animals there is a well defined muscular ventricle 

 and a comparatively thinwalled pyloric ventricle. The in- 

 terest is not lessened by the fact that in Varanns — a li- 

 zard the diet of which is most comparable to that of the 



' Oppel: Lehrbuch d. vergl. mikr. Anat. I. Teil. Der Magen. Jena 

 1896. 



