1896.] NATURAL SCIENCES OF PHILADELPHIA. 311 



which includes the right lung. I have noted the following modifica- 

 tions : In Agama colonoram the left gastropulraonary has become a 

 right gastrohepatic by its continuing to the liver, a character ob- 

 served in Chamceleon and the Anolinse. There is also in this species 

 a left hepatoraarginal. In Megalochilus auritus there is a right 

 hepatoventral, as in Phrynosoma. 



In the Iguanidae the hej^atic mesenteries conform to the general 

 type, with certain exceptions to be mentioned. Thus there are no 

 right or left lateral hepatic mesenteries, and but one ventral. The 

 right hepatic supports the right lung. There is frequently a rudi- 

 mental right lateral hepatic which connects the long right apex of 

 the liver with the right body wall. There is a gastrohepatic which 

 generally spreads over the space enclosed in the bend of the stomach. 

 There is no left gastroparietal sheet or band. The most remarkable 

 deviation from this type (which I have verified in twenty genera) is 

 found in the Auolinie. Here the left lung, besides its superolateral 

 connection with the stomach, is connected by a special sheet with 

 the left part of the inferior face of the liver. Thus the latter organ 

 is suspended by two sheets to the left side of the middle line. In 

 genera where this is the case the two sheets are sometimes difficult 

 to distinguish owing to their easy adhesion together. They may be 

 separated by inserting a probe from the free caudad extremity of 

 the lung. 



Another variation from the normal type is seen in the presence of 

 a right lateral hepatic sheet in Phrynosoma and Polychrus (in Poly- 

 chrus gutturosus it is wanting in the one specimen examined). A left 

 lateral sheet is present on the cephalad half of the liver in Cyclura 

 cornuta and Polychrus marmoratus. It is rudimental in Polychrus 

 aeidirosiris, and wanting in P. gutturosus. There is a gastroparietal 

 band in Cyclura cornuta, which is joined by the apex of the peritone- 

 um of the corpus adiposum. 



In the Anguidse the viscera do not display any exceptional 

 features, except as to the serpen tiform genera. The mesenteries are 

 of the typical character, modified in Ophisaurus by the reduction of 

 the left lung. The hepatoventral sheet is very near the left margin 

 of the liver in Pseudopus apus, and the gastrohepatic and right 

 hepatic are near together when slack. ^ 



In the Helodermatidse the mesenteries of Heloderma are charac- 

 teristic. There is a single hepatoventral, and the gastrohepatic has 

 the usual position. The right hepatic goes to the right side of the 



