TRACHELirODA. 95 



edge ; columella produced at the base, subperforated, and 

 provided with three transverse plaits. 



Pyramidella Terehellum. — The Wimble Pyramidella. 

 Plate XII, fig. 26. Smooth, glossy, white, with reddish- 

 brown fasciae ; columella recurved ; inside of the lip smooth. 

 One and one-fourth inch long. Inhabits the American 

 seas. 



Genus 49.— TORNATELL A.— ZamarcA. 



Generic Character. — Shell convolute, ovate-cylindrical, 

 usually transversely striated, and destitute of epidermis ; 

 aperture oblong, entire, with the margin of the outer lip 

 thin ; one or several folds at the base of the columella. 



Tornatella fasciata — The Banded Tornatella. Plate 

 XII. fig. 27. Covered with fine transverse striae; spire 

 produced, apex acute ; aperture straitened, columella with 

 one plait; purplish-red, with two white transverse fasciae* 

 Inhabits the coast of Britain. 



FAMILY IV^. MACHOSTOMA. 



Shell ear-shaped, with the aperture very wide, and the 

 margins disunited ; without any columella or operculum. 



Genus 50.— H ALIO T IS L 



inncEus. 



Generic Character — Shell ear-shaped, usually depressed ; 

 spire short, sometimes depressed, and nearly lateral; aper- 

 ture extremely large, oblong-ovate, and entire in the adult 

 state ; disk perforated with holes, disposed in a line parallel 

 to the left margin, which commences by a notch. 



Hallotis asinina — The Asinine Haliotis. Plate XII. 

 fig. 28. Shell elongated, narrowish, somewhat curved, 

 smoothish, green, marbled with brown; pearly and irides- 

 cent within; marked with oblique undulated striae, and 

 having the spire very short. Two and a half inches long. 

 Inhabits the seas of China and the Moluccas. 



