PLATE 63. 



Mg. 1. 43. 1. IsOTELUS GIGAS. (Pig- 231.) 



• 

 The lower figure represents the caudal shield, and five of the articulations of a very large specimen. The 



superior covering is removed, sliowing tlie converging stria; in the dee]i grooves along the margin. Tlie 

 individual, when perfect, could not have i>een less than nine or ten inches in length : the buckler is of 

 nearly corresponding size. The narrow thickened border, and course of the facial suture, are well shown 

 in tlie specimen. The posterior angles are represented in the figure too much rounded, the one from 

 being broken, and the other from being covered by the stone. The eyes are nearly perfect, and re- 

 markably prominent. 



