ORDER OPHIDIA. 243 



pelago, in which the scales of the back are rough, 

 and carinated Hke those of the tail. Ps. Durvillii, 

 Nob. 



A neighbouring subgenus, that of 



Ophisaurus, Daud. 



Does not differ from the Sheltopusiks, but in having 

 no appearance of posterior extremities. But the 

 tympanum is still visible, and the scales also have a 

 fold on each side of the trunk. The smaller lung 

 makes one-third of the greater 



The species most anciently known (Oph. Cen- 

 tralis, Ang- p^entralis, Lin. Catesb. II. lix.) is com- 

 mon in the South of the United States. Its colour 

 is a yellowish green, spotted with black above. Its 

 tail is longer than the body. It breaks so easily, 

 that this animal has been termed the glass serpetit* 



The Snakes, proper, (Anguis, Cuv.) 



Have also no appearance of extremity visible with- 

 out. Their tympanum is even concealed under the 

 skin. Their maxillary teeth are compressed and 

 crooked, and they have none in the palate. Their 

 body is surrounded with imbricated scales, without 

 any fold on the side. One of the lungs is one-lialf 

 less than the otlicr. 



* Add Ophh Punctatus, Ophis Slriatuhi.i, Nob,, two new species. 

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