STUDY PLATE FOR SCIENTIFIC STUDENTS 



Fig. 20. — I. A. The scales of the back. O.O. Parietal shields. V. Interparietal shield. F. Anterior and 

 posterior frontal shields. S. Supraocular shield. R. Rostral shield. 



2. N.N. Nasal shield. L. Loreal shield. A. Prcocular shield. P. Postocular shield. U.U. Upper 

 labial shields. T. Temporal shields. M. Mental or median lower labial. C. Chin shields. 



3. A. The abdominal plates or shields which are movable. These are used in locomotion. Their 

 edges grip uneven surfaces. B. The chin shields. C. Lower labial shields. D. Upper lip. 



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