CONCHOLOGY. 131 



Shell. Wide, rough, ovate ; spire very short ; aperture very 

 large, oval and sloped anteriorly ; the edges united, the right 

 very thick and dentated ; muscular impression almost in form of a 

 horse-shoe : operculum horny and rudimentary. It was formerly, 

 considered a Patella, from which it differs by the operculum. One 

 species. 



Concholepas Peruvianus. 



7. Genus Harpa. PI. XII. 

 .hiimal Unknown. 



Shell. Oval, inflated, rather thin, with longitudinal parallel 

 ribs formed by the preservation of the band of the right margin ; 

 the spire very short and pointed, the last whorl much longer than 

 all the others together ; aperture large, ovate, with a wide slope 

 anteriorly; the right edge much hollowed, and thickened out- 

 wardly ; the columella smooth and terminated in a point ante- 

 riorly. A beautiful genus. Found in the Indian Ocean. Eight 

 species. 



Harpa imperialis. Harpa nobilis. 



H. ventricosa. H. articularis. 



H. conoidalis. H. rosea. 



H. minor. H. striata. 



8. Genus Dolmm. PI. XII. 

 Animal. As in Pxirpura, 



Shell. Subglobular, thin, surrounded by decurrent flutings ; 

 spire very short, the last whorl much larger than all the others 

 together; aperture oblong, very large, on account of the great 

 excavation of the right edge, which is crenated throughout its 

 length ; columella twisted. Found in the Indian Ocean and Medi- 

 terranean seas. Seven species. 



Dolium galea. Dolium variegatum. 



D. fasciatum, D. perdix. 



D. pomum. D. olearium. 



D. maculatura. 



9. Genus Buccinum. PI. XII. 

 Animal. See Purpura. 



