. Occipital condyle- ; I Fo-amen magivj FiG. 15.—Dorsal view of Skull of Xenopus and Rana. [In the Frog there is no supra-ethmoid present, but a sphenethmoid closes the front of the cranial cavity. The sides of the skull are cartilaginous. A quadrato-jugal is well marked, but the quadrate consists of a piece of cartilage at the posterior end of the quadrato-jugal between the pterygoid and the squamosal. The lower jaw articulates with it. The columella is usually not well shown.'] Make a drawing of the dorsal side of the skull. 36

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1919