72 smith: description op new spondylus anjd helix. 



colour of the upper valve is uniformly an intense purple red, 

 the lower one being somewhat paler. 



Of the three specimens obtained by Mr. Powell, after 

 whom I have much pleasure in naming this species, one was 

 detached from a flat smooth surface, and from its flattened side, 

 the rest of the surface slopes outward. The other two examples 

 are much more coated with nullipores, worm-tubes, etc., and 

 apparently have only had a very irregular attachment. 



Helix (Geotrochus) hedleyi. 



Testa imperforata, polita conzca, ad peripJieriam acute angulata, 

 infra plana, cinnainomea, infenie castanea, ad carinam linea 

 angusta opaca liitea cmcta, zona angusta castanea infra 

 sutnram in anfradu ultimo 07-nata lineis incrementi 

 perobliqids tenuibus striata ; anfractns 7, suprenii 4 convexi, 

 seqnentes duo plant, ultinius hand descendens, supra anguluin 

 Iceviter concavus, infra fere planus, striis radiantibus incre- 

 menti tenuibus, li?ieisque paucis irregularibus concentricis 

 inipressus ; apertura obliqua, angusta, albida ad carinam 

 canaliculata , effusa ; peristoma castaneo-marginatum, 

 margine superiore expanso, inferiore valde reflexo, incrassato, 

 supra umbilici regionem dilatato. 



Alt. JO millim., diam. viaj. j6, min. jo. 



Hab. : Probably New Guinea. 



This handsome species is elevately conical, the almost 



straight outlines forming at the apex an angle of about 60 



degrees. It is sharply keeled at the periphery and almost quite 



flat beneath. The upper and lower surfaces present a strong 



contrast of colour. The base is uniformly dark chestnut 



brown, whereas the rest of the shell is of a yellowish buff tint, 



excepting a fine opaque luteous line upon the keel, which 



revolves up the spire forming a distinct margination above the 



suture, and a narrow dark brown zone beneath the suture. 



The first four whorls are rather convex, the next two are almost 



flat, and the last or body-whorl is distinctly concave above the 



carina. The surface is glossy, and exhibits distinct, very 



fine, oblique and flexuous lines of growth, in addition to which, 



under a powerful lens, minute but feeble spiral striae are 



J.C., vii., July, 1S92 



