179 



lines. TVhorls, 4frds, scarcely rounded, with a very light suture. 

 Aperture, very slightly expanded ; semielliptical, widest m the upper 

 third of the labrum, very obliąue. Lahrum, pectinated by the spirai 

 carinae ; double, very shghtly reflected. Labium, shghtly below the 

 plane of the labrum, well detached froin penult whor], but connected 

 with it by five or six of the spirai carinae ; arcuated to the left above 

 into a sharp angle with the labrum, very much curved below to the 

 right. Umhilicus, very small and deep. Labral lamella, strongly 

 produced above, but imraediately lošt in the umbilicus. Oj)erculum, 

 semieUiptical, planular, with fine granulations ou the labral side, and 

 concave on the labial side, with a raised ridge all round, which is 

 much thickened and rounded, and highly raised about the lower part 

 of the labral side. 



Height 0-081, greatest breadth 0-103, least breadth 0-08. 



Named in complimeut to my friend Dr. Livesay, a devoted col- 

 lector of genera. 



Stoastoma, or Electrina, succineum, Sowerby, will belong 

 to this group. See Cat. Phan. p. 228. 



Genus V. Metcalfeia, Chitty. 



Shell, depressed conic. 



Metcalfeia Chittyana, Chitty. See Stoastoma Chitty anum, 

 Ad. Mon. Stoast. Ad. 1849, p. 10 ; Cat. Phan. p. 231. 



Hab. Peace River, Manchester. 



Operculum, very shghtly concave, with two strong lamellse Cross- 

 ing its centre horizontally, and on the labial side two much finer 

 ones above, and three or four below. 



Metcalfeia Metcalfeiana, Chitty. 



Hab. ? Hanover. 



Form, depressed conic. Colour, pale hom. Sculpture, lines of 

 growth visible ; sixteen strong, but not much raised inequidistant 

 spirai carinae, those round the umbihcus beiug most prominent, with 

 here and there one very fine carina intervening. On the upper 

 ■vvhorl, 5 carinae. Spire, moderately elevated with very slightly con- 

 cave outlines. Apex, obtuse. TFhorls, 4i, very moderately couvex, 

 with a lightly impressed suture. Aperture, subsemicircular, slightly 

 spreading. Labrum, subangularly produced from the body-whorl, 

 not abruptly produced, deeply pectinated by the spirai carinse. La- 

 bium, slightly detached from the body-whorl, very shghtly curved 

 below to the right ; much below the plane of the labrum. Umbilicus, 

 very deep and narrow. Labral lamella, very little, but sharply, pro- 

 duced, not concealing the umbilicus. Operculum, shghtly concave, 

 finely granulated in the hollow with three strong apparently not ser- 

 rated horizontai lamellae, extending from the labral side over two- 

 thirds of the width of the operculum, and one equally strong between 



