160 HERPETOLOGY OF MICHIGAN. 



' Marf>iiial platen. The scales about the maijiiii of tlie carapace in 

 turtles. ( See Fig. 24.) 



Xasal ]>laie or ]>lates. The first one or two ])lat(^s on the side of 

 the head in snakes. (See Fig. iM.) See also jirenasal and j)ost- 

 iiasal. 



Xnchal })late. The small ])late in the marginal series at the 

 anterior end of the carapace in tnrtles. (See Fig. 24.) 



Ocnlar plates. See pr-eocnlar and postocnhir ])lates. 



Parietal ])lates. The ])air of large scales on the toj* of the head, 

 hack of the frontal and snpraocnlar ]>lates, in snakes. (See Fig. 

 22.) 



Pectoral plates. The third pair of scntes on the ])lastron in 

 tnrtles. 



Pit. The ojiening on the side of the head, between the eve and 

 nostril, in the rattlesnake. 



Plastron. The lower shell in tnrtles. (See Fig. 25.) 



I*late. A large scale. Svnonvmons with scnte. 



Postnasal plate. The i)osterior nasal scale, wlu^n there are two, 

 in snakes. (See Fig. 21.) 



Postocnlar ] dates. The series of scales jnst behind the orbit in 

 snakes. (See Fig. 21.) 



Prefrontal ])lates. The i)air of large scales on the lop of tlie 

 head, jnst in front of the frontal and sni)rao(iilars. in snakes. 

 (See Fig. 22.) 



Prenasal ])late. The anterior nasal scale, when there are two, in 

 snakes. (See Fig. 21.) 



Preocnlar ]»late or ])lates. The scale or scales jnst in front of the 

 orbit in snakes. (See Fig. 21.) 



Rattle. The dermal strnctnre on the tail in rattlesnakes. 



Rostral j)late. The large scah^ <m the end of the snout in snakes. 



Scales. Thin hornv outgrowths of the skin ^^•hich overlax^ to 

 form a more oi- less coni])lete investment in i'e})tiles. When large 

 known also as ])lates and scntes. 



Scale pits. Tiny pores at the ai)ex of the scales in some snakes. 



Scnte. A lai-ge scale. Synonvnnjns with ])late. 



Snbcandal plates. The large scales on the ventral snrface of the 

 tail in snakes. (See Fig. 28.) 



Sn])raocnlar ]»late. The large scale above encli vyv in snakes. 

 (See Fig. 22.) 



Temporal jilates. The scales on the side of the head, behind the 

 postocnlars. in snakes. (See Fig. 21.) 



