PLATE 63. 
1. 43. 1. Isotelus GIGAS. ( Pag. 231.) 
The lower figure represents the caudal shield, and five of the articulations of a very large specimen. The 
superior covering is removed, showing the converging striaj in the deep grooves along the margin. The 
individual, when perfect, could not have been 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 the 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. 
