MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 61 



or ovate aperture. Velutinus, velvety, tlie 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 flexilis. 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 

 Up toothless. Buc. 



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

 with the turns convex, longitudinally striate and sulcate, 

 with oblique waved convex ribs. Undatus, 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. Anglicanus, English. 



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

 convex, transversely ribbed, and longitudinally sulcato- 

 striate turns, the notch wide and oblique. Brevis, short. 



GENUS 2. NASSA. Shell ovate, with the spire mode- 

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

 F 



