36 TERMS USED 



Lcevis is with the edge of the aperture smooth, as in Murex 



Pusio and Melon gena. 

 Striata is when the inside of the aperture is marked with 



Unes, as in Murex senticosus. 

 Edentula is when the aperture is without any teeth, as in 



Buccimmi Perdix and Nerita Canrena. 

 Dentata is when the aperture has teeth on one side or the 



other, as in Biiccimmi Pomwn and Murex tritonis. 

 Utrinque-dentata is when the aperture has teeth on both 



sides, as in VoliUa Coffea and in the genus Cyprcea. 

 Uni-dentata is when the aperture has one tooth only, as in 



Trochus Labio and Turbo Uva. 

 Bi-dentata, Tri-dentata, &c., the aperture with two teeth, with 



three teeth, &c. 



OF THE TAIL, CAUDA. 



Ecaudata is when the shell has a notch or hollow on the 

 margin at the part fiu'thest from the spire, but not extended 

 into a groove or canal, as in Murex Hrppocastouum and 

 neritoideus. 



Brevis is when the canal is very short, as in Murex tritonis 

 and Pusio. 



Truncata is when it appears as if a part had been cut off, as 

 in Murex ramosus and Scorpio. 



Prominens is when it extends but a little way, as in Buccimim 

 echinoplwrum. 



