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PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Dec. 14, 



teeth on the vomer. The centres of the vertebrae are ossified, but 

 biconcave, and the spinal processes large and flattened. The ribs 

 are short in proportion to the size of the animal. The bones of the 

 limbs are short and stout. The body was covered with broad and 

 thin scales, the usual form and sculpturing of which I have endea^ 

 voured to represent in fig. 13. These structures are evidently much 

 in advance of those of Archegosaurus and other genera included in 

 the Order Ganocephala of Owen, and indicate affinities rather with 

 the Labyrintliodontia. The bones of the legs and feet also, though 

 scattered and only in part observed, indicate adaptation for walking 

 rather than swimming. 



Hylonomus, gen. nov. 



The other reptilian remains represent three species belonging to 

 a generic form which, so far as I am aware, has not been previ- 

 ously observed, and for which, in allusion to its forest habitat, I 

 propose the above name. As its typical species I sball describe that 

 of which some remains are represented in figs. 14-18, and which I 



Figs. 14-18. — Hylonomus Lyellii/rom the Goal-measures of Nova 



Scotia. 

 Fig. 14. Fi 18 _ 



Fig. 15. Fig. 16. 



Fig. 17. 



Fig. 14. Teeth, magn. 15 diam. 15, 16, 17. Scales, magnified; the vertical line 

 shows the real length. 18. Phalanges, magnified ; nat. length shown by 

 the straight line. 



would name Hylonomus Lyelli. Its cranial bones are thin and 

 smooth ; the condyle I have not been able to observe, but there is a 

 parietal foramen, and the parietal bones are arched in such a manner 

 as to indicate a rounded rather than flattened skull, and a somewhat 

 capacious brain-case. Its teeth are numerous (about 26 in each 

 maxillary bone), elongated, conical, closely set in a single series, in a 

 furrow protected externally by an elevated alveolar ridge. In the 

 intermaxillaries and extremities of the mandibles the teeth are larger 

 than elsewhere. Pig. 14 represents a portion of the teeth of the 

 maxillary bone as exposed by the fracture of the outer ridge. The 

 vertebra? are imperfectly preserved, but appear to have been ossified, 

 biconcave, and with well- developed spinous processes. The ribs are 



