116 MANUAL OF THE MOLLUSCA. 



Fossil, 1 sp. (? Chalk. Brit.) Miocene. S. Em-ope. 

 Sub-genus, malea, Valenc. (D. personation) outer lip thickened and denti- 

 culated ; inner lip with callous prominences. 



HARPA, Lani. Harp-shell. 



Type, H. ventricosa. PL VI., fig. 11. (=Buc. harpa, L.) 



Shell, ventricose ; with numerous ribs, at regular intervals; spire small ; 

 aperture large, notched in front. No operc. 



The animal has a very large foot, with the front crescent- shaped, and 

 divided by deep lateral fissures from the posterior part, which is said to sepa- 

 rate spontaneously when the animal is irritated. Mostly obtained from deep- 

 water, and soft bottoms. 



Distr., 9 sp. Mauritius, Ceylon, Philippines, Pacific. 



Fossil, 4 sp. Eocene . France. 



COLUMBELLA, Lam. 



Eti/m., diminutive of columba, a dove. 



Type, C. mercatoria. PL VI., fig. 1 0. 



Shell, small ; with a long narrow aperture ; outer lip thickened (especi- 

 ally in the middle), dentated ; inner lip crenulated. Operculum very small 

 lamellar. 



Distr., 200 sp. Sub-tropical. W. Indies, Medit., India, Gallapagos, 

 California. Small, prettily-marked shells ; living in shallow water, on sandy 

 flats, or congregating about stones. (Adams.) 



Fossil, 8 sp. Miocene . (The Brit. sp. 



Sub-genus. Columbellina, D'Orb. 4 sp. Cretaceous. France, India. 



aper- 



