i82 Mr. Mantell on the iguanodon, ' 
satisfactory, for in an Iguana which Mr. Stutchbury had pre- 
pared to present to the College, we discovered teeth possess- 
ing the form and structure of the fossil specimens. 
In the annexed drawing, Plate XIV. examples of the recent 
and fossil teeth are represented, and the peculiar characters 
of each accurately shown ; a description of it in this place 
will render the subsequent observations more intelligible. 
Fig. 8 represents a portion of the upper jaw of the iguana 
viewed from within ; it is magnified four diameters. 
9 a shows the inner, and 9 h the outer surface of a tooth of 
^ the same, greatly magnified. It may be proper to remark, 
that the teeth differ considerably in the number of points, 
and that the eminence at/, fig. 9 a, is sometimes the first or 
second in the series, instead of being the third, as in the 
figure. In some teeth the points vary but little in size ; they 
are more distinct on the edges of the teeth occupying the 
centre of the jaw, than in the anterior and posterior ones. The 
skeleton from which the drawings were made is three feet 
six inches in length. It is said to be the common edible 
iguana of the West Indies, but I have not been able to ascer- 
tain its species with certainty. The remaining figures repre- 
sent different examples of the fossil teeth. 
Fig. 1. a represents the outer, and fig. 1. b the inner sur- 
face of one of the largest and most perfect specimens of the 
teeth of the iguanodon. As the letters of reference in each 
figure indicate the same parts, they are explained here to 
avoid repetition. 
а. Surface worn by mastication. 
б. The serrated edges. 
c, Fang broken; the cavity filled with sandstone. 
