Euchelus.} GASTROPODA. 149 



KEY TO SPECIES. 



A. Shell imperforate when adult . . . . . . . . bellus. 



B. Shell distinctly perforate when adult . . . . . . Hamiltoni. 



1. Euchelus bellus, Button, 1873. Plate 38, fig. 26. 



EutJielus Mliis, Hutt., C.M.M., 37 ; Man. Conch. (1), xi, 435, pi. 67. f. 80 ; 

 Snter, P. Mai. S., ii, 282. Huttonia tricolor, T. W. Kirk. T.N.Z.I., xiv, 

 1881 (1882). 282. 



Shell small, globose-conic, solid, thick, imperforate when adult. 

 Sculpture consisting of spiral granose lirse, the interstices narrow ; 

 there are 7 or 8 equal lirse on the penultimate whorl, 10 on the body- 

 whorl. Colour brownish or bluish-black ; " dead shells " are pink, 

 varied with darker. Spire short, conic, very little higher than the 

 aperture ; outlines convex. Protoconch small, depressed, of li whorls, 

 the first whorl smooth, the following half with 2 granose keels. 

 Whorls 5, convex, the last globose, descending in front ; base con- 

 vex. Suture canaliculate. Aperture rounded, lirate inside and nacreous 

 with steel-blue and dark-red reflections. Outer Up convex, thick, 

 denticulate, with a strongly wrinkled callosity inside. Columella con- 

 cave, terminating in a tooth, below which there is a narrow notch, 

 and another tubercle or tooth on the basal lip equal in size to the 

 columellar denticle ; very often there is a second notch, followed by 

 a smaller tubercle. There is a groove at the place of the umbilicus. 



Diameter, 6-5 mm. ; height. 6-5 mm. 



Dentition unknown. 



Type in the Dominion Museum, Wellington. 



Hab. Chatham Islands (type) ; Bay of Islands to Cook Strait, 

 under stones near low-water mark. 



Remarks. This shell is mostly covered by a scarlet-coloured 

 sponge. There is nothing to separate Kirk's species from E. bellus. 

 Hutton founded the species on " dead shells " from the Chathams, 

 in which the nacre of the aperture had been lost. I have compared 

 the types of the two species, and there is absolutely nothing to separate 

 them. 



2. Euchelus Hamiltoni, T. W. Kirk, 1882. 



Huttonia Hamiltoni, T. W. Kirk, T.N.Z.I.. xiv. 1881 (1882), 283. Euchelus 

 Hamiltoni, T. W. Kirk, Man. Conch. (1), xi, 436 ; Suter, P. Mai. S.. ii, 



282. 



Shell small, globose, solid, perforate. Sculpture consisting of fine 

 spiral granose liree, with the interstices of the same width, 8 lirse on the 

 penultimate whorl, about 18 on the last. Colour of the beach-worn 

 specimens white, or faint pinkish-white, with points of darker colour 

 forming diagonal lines across the whorls. Spire short, conical, nearly 

 the same height as the aperture, outlines convex. Protoconch depressed 

 globose, of If whorls, the first smooth. Whorls 3J, rapidly increasing, 

 convex, the last descending in front ; base convex. Suture canaliculate. 



