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Show ^899.] 'LANTHAXOTCS BORNEEWSIS, 597 the absence of a postfronto-squamosal arch, the slender clavicles, the absence of transverse processes to the interclavicle, together with the character of the tongue, settled the question beyond dispute. The sciagraph further revealed the fusion of the pre-maxillaries and of the parietals, which are devoid of a pineal foramen, the distinctness of the nasals and of the frontals, the presence of a small supratemporal, and the absence of a squamosal. The vertebra? numbered 103 : 8 cervical, 26 dorsal, 1 lumbar, 2 sacral, 66 caudal. The first three dorsal vertebra? bore sternal ribs, as in Varanus, Heloderma having 4 sternal ribs. The phalanges, in both manus and pes, numbered 2, 3, 4, 4, 3 ; there was thus one phalanx less in the fourth digit and in the fifth toe than in Heloderma and Varanus. Tbe resemblance of the open mouth of Lanthanotus, as shown in the accompanying figure, to that of Heloderma was extremely Open mouth of Lanthanotus bomeensis. striking. The teeth were similar in both genera, but they showed no traces of grooves in Lanthanotus. There were 7 teeth in the pra,inaxillary bone, 12 in each maxillary, 12 in each ramus of the mandible. The palate wras toothed as in Heloderma: one tooth on the palatine bone, four on the pterygoid. The tubercles on the head and body were devoid of ossifications. The lower eyelid was entirely occupied by a single semitransparent shield. The specimen in the Sarawak Museum, a male, obtained in the Rejang River District in 1891 by the Hon. C. A. Bampfylde, was a little smaller than the type in the Vienna Museum. It had a total length of 310 millim., in which the head entered for 22 and the tail for 160 ; fore limb 30, hind limb 38. P R O C . ZOOL. Soc-1899, No. X X X I X . 39 |