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terminated by an oblique notch; unequally toothed on the columella and on 

 the internal margin of the right lip, usually contracting the aperture. 



R. horrida, 

 ' miticuln, 

 ' clathruta, 



R. arachnoidea, 

 ' digitata, 



R. aspora, 

 ' morus, 



Purpura. Shell oval, smooth, tubercular or angular 

 the lower part terminating in an oblique, subcanaliculated 

 flattened, pointed at the base. 



Persica, 



Rudolphi, 



patula, 



columellaria, 



succincta, 



consul, 



armigera, 



bitubercularis, 



hippocabtanum, 



u n data, 



haemastoma, 



mancinella, 



bufo, 



callosa, 



P. neritoides, 

 planospira, 

 callifera, 

 coronata, 

 carinifera, 

 scalariformis, 

 sacellum, 

 squamosa, 

 rugosa, 

 textilosa, 

 sertum, 

 Francolinus, 

 linibosa, 

 ligata, 



P. cruentata, 



' lapillus, 



' imbricata, 



' lagenaria, 



' cateracta, 



' bicostalis, 



' plicata, 



' fiscella, 



' thiarella, 



' rustica, 



' semiimbricata, 



' ecliinulata, 



' hystrix, 



' deltoides, 



R. mutica, 

 ' pisolina. 



; aperture dilated, 

 notch. Columella 



P. unifascialis, 



' retusa, 



' trochlea, 



' clavus, 



' fasciolaris, 



' vexillum, 



' bizonalis, 



' nucleus, 



' distorta, 



' bulbus, 



' subrostrata, 



' tectum, 



' cariosa. 



Monoceros. Shell oval; aperture longitudinal, the lower part terminating 

 in an oblique notch. A conical tooth on the internal base of the right margin. 



M. cingulatum, M. striatum, M. glabratum, M. crassilabrum. 



' imbricatum, 



Concholepas. Shell inflated oval, semispiral, the summit inclining ob- 

 liquely towards the left margin; aperture large, longitudinal, oblique, with a 

 slight channel at the lower part. Two teeth at the base of the margin; an 

 oblong, thin, corneous operculum. 



C. Peruvianus. 



Harpa. Shell oval, more or less inflated, with longitudinal, parallel, in- 

 clined and acute ribs; spire short; aperture notched at the lower part; no 

 canal. Columella smooth, flattened and pointed at the base. 



H. imperial is, 

 ' ventricosa, 

 ' conoidalis. 



H. nobilis, 

 ' articularis, 



H. rosea, 

 ' minor, 



H. striata, 



1 fossil species. 



Dolium. Shell thin, ventricose, inflated, mostly subglobular, rarely ob- 



