200 



the frontal groove, converging towards the middle, and terminating 

 at its inner border in a very slightly curved serrated edge ;. one or 

 two ribs terminate near the middle of the back. False ribs few, and 

 terminating in teeth only between the beaks. No dorsal line. 



Length "475 of an inch ; breadth -400; height -250. 



Habitat. 



Its distinctive characters from Cypr. sanguinea are : teeth much 

 more numerous and even ; no ribs terminate on the lip, rarely more 

 than one or two on the side of the back, and they are of the colour of 

 the shell; colour much lighter, and the beaks on the base deepest- 

 coloured. 



Cab. Gaskoin, 



Cypr^a producta. Cypr. testd ovato-subglobosd, bast planulatd, 

 transversim costatd, albidd; marginibus crassiusculis, ad extremi- 

 tates subdepressis ; aperturd angustiore, labri margine subrectd, 

 columella jlexuosd, acutanguld ; lined dorsali nulld. 



Shell ovato-subglobose, of a uniform dull white colour. Aperture 

 rather narrow: teeth prominent and even, about twenty-six on the lip, 

 and twenty-three on the columella ; between the beaks there are about 

 five or six rather strongly marked denticulations. The columellar edge 

 of the aperture forms a sharp line, within which is a broad and rather 

 deep o-roove, extending the length of the mouth, deeper at each end ; 

 the ribs, extending through it, form on its inner border a denticulated 

 hue, and they are more acutely prominent within the aperture than 

 on the outside of the shell. Ribs prominent, smooth, (interstices 

 uneven,) many terminating on the side of the shell at various di- 

 stances from the middle of the back, those continuing to the middle 

 about fifteen, a few only of which are continuous down the opposite 

 side, the rest terminating in the centre of the dorsum between each 

 other, but not in obtuse or thickened ends : false ribs about six pos- 

 teriorly and eight anteriorly, and, like those in the Cypr. sanguinea, 

 extending high up towards the back. Extremities much produced, 

 somewhat flattened. Margins thick. No impressed dorsal line. An- 

 terior beaks wider apart than the width of the aperture, and within 

 each of these beaks is a slight impression or groove. 



Length -500 of an inch ; breadth -375 ; height -300. 



Habitat. 



It is thus distinguishable from Cypr. scabriuscula : it has no dorsal 

 line ; ribs much larger and prominent ; has wide margins ; a broad and 

 flattened base ; a slight groove within the anterior beaks ; extremi- 

 ties much produced and flattened, &c. 



Cab. Gaskoin. 



I am indebted for the very appropriate appellation of this species 

 to my friend Mr. Gray. 



Cypr^a candidula. Cypr. testd ovato-globulosd, latere columel- 



lari subventricoso, nived ; extremitatibus columellaribus subcom- 



■ pressis ; margine subincrassatd ; aperturd subangustatd, postici; 



reairvd ; labri dentibus numerosis confertis ; costis ex apertvrd 



divergentibus ; lined dorsali nulld. 



