232 SOLARIIDyE. 



and having very little gloss : sculpture, strong and prominent, 

 but narrow, spiral ridges, of which there are on the body- 

 whorl, 2 on the next, and none on the upper two whorls, 

 which are (piite smooth and polished ; the ridges on the body- 

 whorl are thus disposed, — 1 close to the sutural line, 2 below 

 it, 1 on the periphery, and 2 encircling the base ; the inter- 

 stices of all the ridges are crossed by numerous longitudinal 

 stria}, which are sometimes curved or flexuous ; there are also 

 still more numerous microscopical lines that traverse the 

 whole surface obliciuely ; the effect of all these markings is an 

 exquisitely beautiful ornamentation : colour white, with some- 

 times a yellowish- or reddish-brown stain, apparently the re- 

 mains of an epidermis : s^y'ire extremely short : whorls 3|-4, 

 compressed, rajndly enlarging ; the upper part of the body- 

 whorl slopes towards the perii)hera] ridge, which forms a sort 

 of keel; this whorl, viewed with the mouth downwards, oc- 

 cupies more than two-thirds of the spire : mture v/ell defined, 

 but not deep, in consequence of the upper part of each whorl 

 shelving towards the next: mouth large, indented by the 

 ridges: outer lip projecting far beyond the other lip, rounded 

 and sharp-edged ; uj^per angle or corner acute : inner Up re- 

 flected on the upper part of the base (where it joins the outer 

 lip) and slightly over the umbilicus, thickened and angulated 

 on the under side, below which it makes a straight course; 

 outwards, where it ends in a small notch ; this is very con- 

 spicuous Avhen the shell is held on one side, with the spire 

 from the observer : umhilkus rather large, obli<iuely sloping 

 inwards, defined by the lower l)asal ridge, and striated length- 

 wise, more strongly as the shell advances in age : opercaluni 

 thin, oblicjuely striated in the line of growth; spire extremely 

 small, comprising several minute and close-set turns, and not 

 unlike that of the operculum of a Natiai ; the outer whorl is 

 disproportionately large. L. 0-04. ]i. 01. 



Habitat : Laminarian and coralline zones, Sandwicli 

 (Walker and J. G. J.) ; Dover (Lyons, fide Montagu) ; 

 Dorset, Devon, Cornwall, and ]5ristol Channel (Mon- 

 tagu and others) ; Guernsey and Barmouth (J. G. J.) ; 

 Irish coasts (Turton and others) ; Lamlash Bay, Bute 

 (Norman) ; Aberdeeiisliire (Dawson), lied and Coral- 

 line Crag (S. Wood) ; Belgian tertiaries (Nyst, as A. 

 supramtida) ; Dax (Hasterot); ^Tartillac (Grateloup) ; 



