CATECHISM OF CONCHOLOGY. 



is large in proportion to the spire, which seems 

 to proceed from the centre. That the aperture 

 is effuse, having the lips separated by a gutter, 

 length greater than the breadth, without teeth, 

 entire at the base, pillar smooth. 



Q. Does not the Conus resemble the Voluta 

 and Trochus ? 



A. Yes, in some respects, but it may be readily 

 known by observing that the Voluta has & plaited 

 not a smooth columella ; that the aperture of^ the 

 Trochus is transverse (in a cross direction), and 

 not longitudinal; and that in the Conus the 

 conical form is erect, and not inverted. 



Q. From what is the name derived ? 



A. From the similarity which its species bear 

 to a cone. 



CHAP. XXIV. 



UNIVALVES: 

 CYPR^EA; Cowry. 



Q. WHAT kind of shell is the Cypraea? 



A. An involute (without a spire), subovate 

 (nearly oval), obtuse and smooth ; one aperture, 

 effuse, open at both ends, linear (length of the 



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