1905.] 



OF THE YELLOW-THROATED LIZARD. 



261 



prolonged right lobe of the liver and the gonad, both male and 

 female, does not bear vipon the question of the affinities of Gerrho- 

 saurus. For among the Skinks these organs may be in contact or 

 separated by a ligamentous interval. 



MusGidar fibres in Mesenteries. — As is the case with other 

 Saurians, Gerrhosaurus has bands of unstriped muscle in several 

 of the mesenteries. The most impoitant of these is a bundle of 

 muscular fibres which accompanies the anterior abdominal A^eiu 

 (text-fig. 35, in) and runs into the gastro-hepatic ligament. It 

 is a thick bundle of fibres, but after traversing the gastro-hepatic 

 ligament for about half its extent it fans out into a fine bundle, 

 the individual fibres of which hardly reach the stomach. This 

 bundle is represented in many lizards. But the conditions 

 observable in Gerrhosat(,rn,s throw no light upon the affinities of 



Text fig. 35. 





Gastro-hepatic ligament of Gerrliosaiirusflavigularis, showing course of 

 muscu^lar bundle. 



A. Gastro-hepatic ligament ; Ant.Ahd. Anterior abdominal vein ; G-. Stomach ; , 

 L. Left lobe of liver ; m. Muscular band. 



that lizard. For though it differs from the arrangement found 

 in the Scincidae, it shows no likeness to what is found in Lacerta 

 ocellata. In Eumeces, Mao'oscincus, and Lacerta oceUata the 

 bundle of fibres is continued without fanning out to the stomach, 

 where it forms a close investment of that organ for the greater 

 part of its extent in Macroscincus. Inasmuch as both specimens 

 of Gerrhoscmrus were identical in the characters of this muscle, 

 it may, I think, be assumed that its condition is tjqDical of the 

 species. 



Pancreas. — The pancreas of Gerrhosaurif,s (text-fig. 36, p. 262) 

 differs from that of Lacerta ocellata in the comparative stoutness 

 of the branch which goes to the spleen. It is, in fact, like Leydig's 

 figure of the pancreas of Lacerta agilis, expanding when it reaches 

 the spleen. The pancreas of Gerrhosaurus furthermore differs 

 from that of Lacerta (at any rate ocellata) in that there is a 



