XIV rroeeedings of the Association of American Anatomists 



MARKED DIFFERENCES BETWEEN THE SKIN OF THE MALE AND 

 THAT OF THE FEMALE FROG. By A. O. Fisher. Department of 

 Anatomy, Vniversity of Wisconsin. 



During the fall the dermis of the female frog is thinner and is less 

 resistant to acids and alkalies and digestive fluids than that of the male. 

 These changes seem to be associated with the formation of the ova. 



THE BLOOD AND LYMPH VESSELS OF THE LLTNG OF NECTURUS. By 

 William S. Miller. Department of Anatomy, University of Wisconsin. 



THE MESENTERY IN AMPHIBIA AND REPTILIA. By William S. 

 MiLLEK. Department of Anatomy, Vniversity of Wisconsin. 



In this note, attention Avas called to the lesser peritoneal cavity 

 (bursa hepato-enterica) in Xecturus, Cryptobranchus, Amblystoma and 

 Chrysemys. 



In Xecturus the ligamentmn hepatogastricum is attached to the liver 

 along the course of the hepatic-portal vein and to the cephalic half of the 

 stomach, the gastric attachment being less than the hepatic. Between 

 the caudal margin of this ligament and the entrance of the ductus 

 choledochus into the intestine there is complete absence of any mesentery 

 on the ventral side of the stomach. The ligamentum hepato-cavo- 

 pulmonale extends as an unbroken fold from the liver to the mid-dorsal 

 body wall. The dorsal mesentery caudal to the splenic blood vessels 

 has a large perforation. There are therefore two openings into the 

 bursa hepato-enterica, one ventral to the stomach, the other at the 

 caudal end of the dorsal mesentery. These two openings are already 

 present in embryos 25 mm. in length. 



In Cryptobranchus the intestine forms a long loop after leaving the 

 stomach. The liver is connected with the stomach and intestinal loop by 

 a ligamentum hepato-gastro-duodenale and it is without any perforation. 

 A ligamentum hepato-cavo-pulmonale is present and it also is intact: 

 but caudal to the ductus choledochus there is an opening leading into the 

 bursa hepato-enterica, a true foramen epiploicum. The dorsal meso- 

 gastrium has a wide opening in it caudal to the splenic blood vessels 

 and. in this respect shows a less complete bursa than Necturus. 



In Amblystoma the ligamentum hepatogastricum extends the entire 

 length of the liver, but like jSTecturus, its gastric attachment is shorter 

 than its hepatic; the opening between its caudal margin and the ductus 

 choledochus is smaller than in Xecturus. The ligamentum hepato-cavo- 

 pulmonale is without any perforation. The dorsal mesogastrium has 

 undergone a very considerable modification. Only the extreme cephalic 

 end of the stomach is in connection with this membrane; it is tlien 



