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Show 1 9 0 5 .] OF THE YELLOW-THROATED LIZARD. 2 6 1 prolonged right lobe of the liver and the gonad, both male and female, does not bear upon the question of the affinities of Gerrhosaurus. For among the Skinks these organs may be in contact or separated by a ligamentous interval. Muscular fibres in Mesenteries.-As is the case with other Saurians, Gerrhosaurus has bands of unstriped muscle in several of the mesenteries. The most important of these is a bundle of muscular fibres which accompanies the anterior abdominal vein (text-fig. 35, m) 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 Gerrhosaurus throw no light upon the affinities of Text fig. 35. Ant AU Gastro-liepatic ligament of Gerrhosaurus flavigularis, showing course of muscular bundle. A. Gastro-hepatic ligament; Ant.Abd. 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, Macroscincus, and Lacerta ocellata the bundle of fibres is continued without fanning out to the stomach, where it forms a close investment of that oigan for the gieatei part of its extent in Macroscincus. Inasmuch as both specimens of Gerrhosaurus were identical in the characters of this muscle, it may, I think, be assumed that its condition is typical of the ^ Pancreas.-The pancreas of Gerrhosaurus (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 readies the spleen. The pancreas of Gerrhosaurus furthermore differs from that of Lacerta (at any rate ocellata) in that there is a |
