34 TERMS USED 



Subnlata is awl-shaped or tapering, as in Bulla Terebellum. 



Acuta is sliarp-pointed, as in Bulla rivaUs. 



Aciitissima is ending in a very sharp point, as in Strombus 

 costatus and Trochus jmpillosus. 



Obtusa is bknit pointed, and is opposed to Acutus, as in Valuta 

 Coffea and pallida. 



hcevigata is with the whorls of the spire smooth as if worn with 

 water, as in Voluta glabella and Olla. 



Coronata is crowned or encircled with prominences, as in Vo- 

 luta (Bthiopica and several of the genus Conus. 



Inermis is unarmed or without any prominences, and is op- 

 posed to coronatus, as Conus glaiicus. 



OF THE APERTURE, APERTURA. 



Integra is when the mouth is whole or without any canal or 

 notch on the margin, as is the case with the genera Nerita, 

 Helix, Turbo, and Trochus, and part of the genus Voluta, 

 and some Bullce. 



Coarctata is when the aperture is contracted or compressed, as 

 in some Bullce, but without a hollow or notch. 



Effusa is when the aperture has a notch or spout as if formed 

 to pour out a fluid, as the aperture of Cyprcea, which is 

 effuse at both ends, but the aperture of the Cones is effuse at 

 one end only. 



Dilatata is when the a})erture is very much spread out, as in 

 Helix haliotoidea. 



Circinnata is with the aperture round, as in Turbo fontinalis 

 and cristatus. 



