MALACOZOA. GASTEROPODA. PECTIMBRANCHIATA. 61 



or ovate aperture. Velutinus, velvety, the epidermis 

 being so in some of the species. 



1. Velutina striata. — Shell roundish ovate, brittle, 

 whitish, striated, with an olivaceous villous epidermis. 

 Stridtus, streaked. 



Genus 2. Coriocella. — Shell oblong or ear-shaped, 

 extremely thin, membranous in part, concealed in the 

 mantle. 



1. Coriocella Jlexilis. — Shell ear-shaped, membran- 

 ous, flexile, olivaceous, with a thin calcareous layer on 

 the inner lip and spire. Flexilis, capable of being easily 

 bent. 



SlPHONATA. 



Family VI. — Buccinina. 



Body elongated, spiral ; head with two conical, de- 

 pressed tentacula ; eyes on basal external lobes, mouth 

 with an annulated proboscis ; mantle with an open canal, 

 foot large. Shell generally ovate, spirate, with a very 

 short notch or canal in the anterior part of the aperture, 

 and a horny operculum. Name from the genus Buc- 

 cinum. 



Genus I. Buccinum. — Shell ovate, with the spire 

 moderate, pointed, the aperture oval or oblong, with 

 a deep notch anteriorly, the columella plain, the outer 

 lip toothless. Buc. 



1. Buccinum unddtum. — Shell ovato-conical, thick, 

 with the turns convex, longitudinally striate and sulcate, 

 with oblique waved convex ribs. Undatns, waved. 



2. Buccinum Anglicdnum. — Shell oblong-conical, thin, 

 with the upper margin of the turns rather thick, and 

 irregularly plicato-nodulose, the turns obsoletely ribbed 

 and striate. Anglicdnus, English. 



3. Buccinum breve. — Shell ovato-conical, with five 

 convex, transversely ribbed, and longitudinally sulcato- 

 striate turns, the notch wide and oblique. B re vis, short. 



Genus 2. Nassa. — Shell ovate, with the spire mode- 

 rate, pointed, the aperture oval or oblong, with a deep 



F 



