TKOCHUS. 509 



articulated. In the former, and this indeed is the ordinary 

 painting, several wavy and obliquely longitudinal streaks 

 of crimson or blackish brown, that are often clouded at 

 one of their edges, not unfrequently interrupted, and often 

 partially confluent, diversify the whitish or pale-coloured 

 ground ; these in our English specimens are almost inva- 

 riably broad, and are replaced upon the inferior surface by 

 a spiral articulation of the same colours. In one of our 

 specimens of the latter, the ground is yellowish drab, and 

 the raised sculpture is alternately dotted with a paler tint 

 of the same hue, and with ashy-brown. The whorls are 

 devoid of any peculiar marginal belt, but are spirally 

 adorned with eight, or more frequently nine, elevated lines 

 or very narrow costelloe, that are but little raised, and ex- 

 cept upon the base, where they are rounded and further 

 apart, not particularly distinct, especially upon the upper 

 portion of the spire, which might rather be termed striated 

 or sulcated. The interstices, and very often the raised 

 sculpture likewise, are minutely and very obliquely tra- 

 versed by crowded longitudinal laminar lines. The volu- 

 tions, which are six or seven in number, and terminate in 

 an acute and often ruddy apex, are flat (except two or 

 three of the apical ones) and occasionally somewhat retuse 

 in the middle ; they are moderately high, the length of 

 the penult being about one half the breadth of the upper 

 edge of that volution : the suture is indistinct. The base 

 is broad (in our British examples), rather abruptly com- 

 pressed, sharply angulated at the edge, and either flat, or, 

 from the customary inferior projection of the basal edge, 

 rather concave near the margin; the axis is imperforated. 

 The aperture is squarish, as the excess (if any) of the 

 breadth is but trifling ; it occupies about half the basal 

 diameter, and about one third of the length of the whole 



