226 EXPLANATION OF TERMS. 



by permanent marks called specific 

 characters. 



Striated. Marked with fine striae, or lines, 

 either hollow or raised ; from stria, a 

 stripe. 



Sinus. A gutter, or curvature ; from sinws, a 

 curved line. 



Sinuous. Having a curvature. 



Subulate. Tapering, or pointed ; from subula, 

 a pointed tool. 



Sagittate. Arrow-like ; from sagitta, an arrow. 



Siphon. A pipe through which liquids are 

 conveyed. 



Sub. In composition means almost, or ap- 

 proaching to. 



Setaceous. Bristle shaped ; from seta, a bristle. 



Semi. Half. 



Sinistral. On the left hand ; from sinistra, the 

 left hand. 



Sides. The right side of a univalve is that 

 opposite the right hand of the person 

 looking at it, when the shell is placed on 

 its base with the aperture in front : the 

 left side is that opposite the left hand, 

 the shell being in the same position. 



Terrestrial. Belonging to the earth ; from 

 terra, earth. 



Testaceous. Composed of the materials which 

 form shells ; from the Latin testa, a 

 shell. 



Tentacula. The feelers of the mollusca ; from 

 the Latin ten to, I try. 



