208 MOLLUSCA. 
described. The little Phasianella stihfera, Turt. (Stihfer turtoni, 
Brod.) is somewhat like it. S. swdalatus, from the West Indies, is 
much less slender. 
Figure 246, 246a, front and profile views of the shell, enlarged ; 
246 5, natural size. 
The sketch of an animal taken from Holothuria at Tahiti, evidently 
a larger and less slender species, is given in outline, merely to afford 
some notion of its form. It accords with Owen’s account of the 
animal, so far as concerns its rudimentary foot, and its enormously 
elongated proboscis. It does not appear, from the sketch, whether the 
whole shell is enveloped in a fleshy mantle or not; the indications are 
that it was not. 
Figure 247, the animal, with an outline of the shell. 
Hantoris crispata (Gould). 
Testa parva, tenuis, convexa, elongato-ovalis, unduls obliquis angulatis 
divaricantibus rugata, spiraliter striata, rubida: spira elevata, sub- 
mediana ; foraminibus parvis, circularibus, confertis, ad septenis 
pervus, extrorsum canaliculatis ; intus undulosa, nitida, argentea. 
Halotis crispata, Goutp; Proceed. Boston Soc. Nat. Hist., 1. 251. 
December 1847. 
SHELL small, very thin and delicate, of an elongated oval, and more 
than usually convex form, the surface marked with fine, regular, 
equal, revolving threads, and with very delicate, branching, oblique, 
zigzag ripples, which are almost equally conspicuous in the interior. 
The spire is prominent, of a little less than three whorls, the apex 
nearly on the median line. The perforations are small, rounded, 
slightly tubular, numerous and crowded, six or seven of them open; 
and external to the series is a deep canal. The colour is bright brick- 
red or red-lead colour, having between the canal and the margin a few 
narrow and distant yellowish-white stripes. The interior is brilliant 
silvery, and somewhat iridescent. 
