EXPLANATION OF THE PLATES. 



Plates I, II, III represent new species of Sauria^ suffi- 

 ciently described in the text quoted. 



Plate IV shows the osteology of certain anomalous Serpents. 



Fig. 1, 2, 3. Head of a Caecilia seen from above, beneath 

 and in profile. It is so extremely anomalous, that it is with 

 much hesitation that we attempt to explain it. 



a.a. Intermaxillaries and Ossa Nasi united. 



b.b. Maxillaries covering the orbit, and perforated by 

 a small hole for the eye. 



c. Single Os Frontis. 



d.d. Anterior Ossa Frontis. 



e.e. Ossa Parietalia. 



f.f. Superior Os Occipitis. 



g.g. Posterior Ossa Frontis? 



h.h. Mastoids and Tympana united. 

 Fig. 4, 5, 6. Head of an Amphisbsena, seen from above, be- 

 neath and in profile. 



a. Single Os Frontis proper. 



b.b. Anterior Ossa Frontis. 



c.c. Ossa Nasi. 



d.d. Maxillaries. 



e.e. Single Os Parietale. 



f.f. Single Os Occipitis. 



g.g. Tympana. 



h. Single Intermaxillary. 



i.i. Pterygoidea Interna. 



k. Sphenoid. 



/./. Ossa Palati. 



m.m. Petrous portions of the Temporal bone? 

 Fig. 7, 8, 9. Head of an Ophisaurus, viewed from above, 

 beneath, and in profile. It is in fact the head of a Saurian. 



