246 PYKAMIDELLID^. 



reddish, with the spiral band indistinct, yet visible in 

 certain Hghts. 



This species is of a slender produced-turreted form, rather 

 thin, a little translucent, of a glossy yellowish- white or 

 flesh-colour, and encircled with a single narrow band of 

 tawny orange, that winds between the inferior suture and the 

 middle of each whorl. The surface is longitudinally tra- 

 versed by about from seventeen to twenty rather strong and 

 prominent ribs, which are a little curved, yet not oblique, 

 convex on their upper surface, not continuous, and nearly 

 if not quite as broad as their intervals. The latter are 

 marked with five or six spiral series of not very profound 

 grooves. The whorls, which are about twelve in number, 

 are plano-convex, broader below than above, simple (not 

 scalariform), rather more than half as broad again as they 

 are high, and of moderate longitudinal increase ; they are 

 separated from each other by a distinct but not excavated, 

 scarcely oblique suture, and terminate in a rather fine 

 point. The base of the shell is only furnished with not 

 very closely disposed spiral strise ; it is not angulated at 

 the circumference, but rounded, yet so far compressed, that 

 the front of the aperture juts out considerably ; its axis is 

 imperforate. The mouth, which occupies from one-fifth to 

 one-sixth of the entire length of the shell, and about 

 one- half the basal diameter, is much longer than broad, 

 and somewhat rhomboidal, but is rounded anteriorly, since 

 the front of the outer lip, which is acute, simple, and jjre- 

 viously nearly straight, is arcuated at its junction with the 

 pillar lip. This last is very narrow, rather long, some- 

 what reflected, and either straight, or leaning a little 

 away from the outer lip. The majority of examples 

 do not exceed the third of an inch in length, and three 

 quarters of a line in breadth. 



