88 LINES OF DESCENT. 
N. tritoniformis, Kien, 
Incrassata, Miill. A large form, passing into the last. 
A short and broad form, large. 
Beautifully cancellated. 
Ribs oblique. 
Passing into the variety N. glaberrima, Gmel. 
These large varieties, of which there are at least twenty, pass 
into the medium, and thence into the small and very small forms. 
The following names, for the most part, were applied to certain 
varieties— 
N. exilis, Gmel. 
Lacepedii, Payr. 
Ascanias, Brug. 
Macula, Mont. 
Rudis, Gault. 
Minuta, Penn. 
Other varieties passing into the— 
N. asperula, Breechi. 
Plebecula, Gould. 
Multigranosa, D’k’r. 
Hotessieri, D’Orb. 
Ambigua, Montg., tall forms. 
Striata, Reeve. 
Varicosa, Turton. 
Coccinella, Lam. 
tosacea, Reeve. 
There are at least a dozen varieties of N. incrassata of a rose 
colour. 
Narrow forms pass into the— 
N. tenella, Reeve. 
Serotina, A. Ad. 
Signata, D’k’r. 
Capensis, variety ribbed and _cross- 
grooved, 
Capensis, D’k’r. 
The last-named shell passes into the narrow costate varieties 
of N. glans, Linn. 
The small varieties pass into the— 
N. Compacta, Angus. 
AEthiopica, Marr. 
Pumilio, Smith. 
