IN DESCRIBING SHELLS. 33 



Cauda, the tail, is found at that part of the aperture which is 

 flnthest from the spire. 



Liobia, the lips, are the edges of the aperture, the outer side of 

 which is called the lip, lahrum* ; it is also sometimes called 

 the outer or right lip, labium exterius vel dextrum ; the inner 

 side, or that part which joins to the preceding turn or whorl, 

 is called the inner lip, labium interius -f ; or the pillar lip, 

 labium columellaX ; or the left lip, labium sinistrot^sum. 



Operadum is that small piece which is separate from the shell, 

 but attached to the foot of the animal, with which it closes 

 the opening when it retires into its shell ; this piece is 

 wanting in a great many shells. 



OF THE SPIRE, 8PIRA. 



Trmicata is with the spire flat as if cut off, and forms the base 

 of the conic shape of Linnasus's first division of Conus. 



Obliterata is when the spire can hardly be perceived, as in 

 Bulla Ficus and Voluta Monilis. 



Prominens is when the spire is rather prominent, as in Voluta 

 Ispidula. 



Producta is when the spire is much more prominent or pro- 

 duced, as in Murex despectus and corneus. 



Longa is when it is very long in proportion to the shell, as in 

 Strombus Pes pelecani. 



* See Voluta glabella of Linnaeus's St/stc?na Naturae, 12th edit. 

 t See Nerita Mammilla, ibid. % See geaus Nerita, ibid. 



