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Glossarj of Scieutiflc Titius Used in Tiirtlf Hulhliri. 



Adult, mature. 



Anterior, front. 



Carapace, the upper eliell. 



Class, a major group of organusms, such as Kept ilia, composed of 



orders. 

 Concentric, a series of more or less circular markings each within 



another. 

 Costal, belonging to the ribs. 

 Depressed, flattened vertically. 

 Dilation, enlargement. 

 Dorsal, belonging to the back. 



Family, the first group smaller than order, composed of genera. 

 Iris, colored portion of the eye. 

 Keel, a ridge, a raised line. 

 Lateral, along the side. 

 Lobe, a flap or lid. 

 Longitudinal, lengthwise. 

 Marginal, pertaining to the edge. 



Order, first group division of a class, composed of families. 

 Osseous, bony. 

 Plastron, the lower shell. 

 Posterior, rear or hinder. 

 Proboscis, snout. 



Scute, any external bony or horny platip. 

 Serration, edged like saw teeth. 



Species, the lowest recognized natural grouping, composing genera. 

 Spine, a sharp pointed projection. 

 Striae, stripes, streaks or scratches. 

 Striations, fine grooves or scratches. 



Transverse, across. i 



Tubercles, small fleshy projections. 

 Ventral, belonging to the under side. 

 Vertebral, pertaining to the backbone. 



