164 



HAEPA. 



aperture wide ; ovate ; columella laminar, flat, oblique ; a spiral 

 series of perforations running along the dorsal margin. — Obs. 

 The splendid shells belonging to this genus are remarkable for 

 the pearly iridescence of the inner surface, and the row of 

 holes following the course of the spire. The soft parts are 

 eaten in Guernsey and Jersey, and reckoned delicious. They 

 belong to temperate and tropical climates. Fig. 338, H. rubra. 

 339, PadoUus, Montf. Mr. Eeeve's monograph contains 73 

 species. 



HALIOTOID. {Haliotis, and eihog, eidos, form.) Ear-shaped. 



HAMIEOE/M. (Hamus, a hook.) Curved at the extremity. 



HAMINEA. Leach. A genus of Bulrid^, the shells of which 

 are thus described by Adams in his Monograph, JSTo. 11, 

 Sowerby's Thesaurus, " shell convolute, horny, thin, transversed, 

 grooved, destitute of columella or spire." 



HAMITES. Parkinson. (Hamiis, a hook.) Fam. Ammonacea, 

 Lam. — Bescr. Elongated, cylindrical, chambered, recurved at 

 the smaller extremity, annulated ; septa lobed and sinuated. — 

 Obs. This remarkable fossil from the Baculite limestome in 

 Normandy, diifers from Baculites in being curved at one extre- 

 mity, a circumstance from which its name is derived. Some 

 small species are found in chalk-marl, Eolkstone. H. cylin- 

 dricus. PI. xxiii. fig. 484.* 



HARPA. Humphry, 1797. (^arjsa, a harp.) Fam. Purpurifera, 

 Lam. Entomostomata, Bl. — Bescr. Oval, ventricose, longitudi- 

 nally and regularly costated ; spire short, with rounded, dome- 

 like whorls ; aperture wide, emarginated ; outer Hp thickened, 

 reflected, composing the last costa or rib ; inner rib polished, 

 spread over part of the body whorl, terminating in a point. — ■ 

 Obs. This beautiful genus of shells is so clearly defined by the 

 regular, longitudinal ribs that adorn the external surface, sug- 

 gesting the idea of a stringed instrument, that there is no 

 danger of confounding it with any other. H. . multicostata, 

 (Buccinum costatum, Linn.) and H. ventricosa, are among the 

 most elegant of the testaceous productions of the sea both in 

 form and colouring ; the former is rare. The recent species are 



