214 SCALARIAD^. 



much elevated, ribs, that are mostly narrow, with here and 

 there a somewhat broader one intermingled, traverse each 

 whorl in a longitudinal direction, but neither form con- 

 tinuous series extending from the apex to the base of the 

 shell, nor surmount the cross-bars of the preceding volu- 

 tion. They are rather more solid below, and more ele- 

 vated, reflected, and laminar above, where they are not at 

 all appressed, but terminate somewhat abruptly and sub- 

 rectangularly. Their intervals, which are nearly smooth 

 (yet extremely fine distant spiral impressed lines, and 

 obsolete longitudinal close-set wrinkles, are here and 

 there apparent), are, upon the larger turns, twice, or 

 even thrice the breadth of the ribs themselves. The 

 whorls, which range from nine to twelve, are rounded, 

 rather short, the height not being above half the breadth, 

 and of slow enlargement. They are but little oblique, 

 and are well defined by a very deep suture, which is not 

 filled up (as in certain Scalarice) by any appression of 

 the crossbars. The body, in middle-sized individuals, 

 occupies one-third of the dorsal length of the shell ; its 

 base is imperforated, devoid of any spiral ridge, and is 

 somewhat flattened ; hence the front of the aperture 

 appears rather projecting. The mouth is rounded-ovate, 

 and occupies one-fourth of the entire length, and full four- 

 sevenths of the basal diameter ; the peristome is unequally 

 thickened, the lower or anterior end of the pillar-lijD, which 

 is not appressed, but reflected, being rather the broadest 

 j)ortion. The arcuated outer lip is a little flattened ante- 

 riorly, and forms a slight angle with the columella. The 

 examples we have described from do not exceed three 

 quarters of an inch in length, and do not exhibit the 

 highest number we have mentioned of either whorls or 

 ribs. A pale rose-coloured specimen of nearly twice this 



