148 GASTROPODA. [Aspidobranchia. 



6. Calliostoma tigris, Martyn, 1784. Plate 40, fig. 6. 



Trochus tigris. Mart., Un. Conch., ii, f. 75. Callioslomn tigris, Mart., Man. 

 Conch. (1), xi. 333 ; x, pi. 41, f. 30 : Suter, P. Mai. S., ii, 280. Trochus 

 granatum. Lam., A.s.V., ix, 145. Zizyphinus granatum, Chemnitz : 

 Hutton, M.N.Z.M., 98, not of Chemnitz. 



Shell large, conical, imperf orate, solid but rather thin, shining. 

 Sculpture consisting of numerous delicate finely beaded lirulee. 16-20 

 on the penultimate whorl, 18-25 on the upper surface of the body- 

 whorl ; the whole of the base similarly sculptured. Colour light- 

 yellowish, longitudinally painted with numerous rather narrow ir- 

 regular chestnut-reddish stripes. Spire elevated, acute, concave above, 

 slightly convex below, very little higher than the aperture. Proto- 

 conch very small, pointed, finely decussate, but mostly worn smooth. 

 Whorls 10-12, the first 6 distinctly shouldered and slowly increasing, 

 the following whorls flatly convex, rapidly increasing, the last whorl 

 large, angularly rounded at the periphery ; base convex. Suture in- 

 conspicuous on the earlier, impressed on the later whorls. Aperture 

 rhomboidal, slightly oblique, iridescent and lirate within. Outer lip 

 sharply rounded on meeting the broadly convex lower lip, sharp, 

 strengthened within by a thick and broad pearly layer. Columclla 

 arcuate, oblique, pearly, bluntly tuberculate at base. Inner lip spread- 

 ing very little beyond the columella ; a very thin transparent glaze 

 spreading over the parietal wall. 



Diameter, 45-58 mm. ; height, 45-59 mm. 

 Dentition unknown. 



Hob. Bay of Islands to Cook Strait ; Chatham Islands. Brought 

 :o England by Captain Cook. 



Remark. This is a rather rare shell, living apparently below low- 

 water mark. 



Genus 5. EUCHELUS, Philippi, 1847. 



Euchelns, Phil., Zeitsc.hr. fiir Malac., 1847, 20. Type: Monodonta tri- 

 carinaia, Lam. = E. quadricarinatus, Chemn. Euchelus, Phil. : Fischer, 

 Man. de Conch., 827 ; Man. Conch. (1). xi, 15, 429. Aradasia. Gray, 

 Fig. of Moll. Anim., iv, 1850, 90. Hv.ttonin, T. W. Kirk, T.N.Z.I.. xiv, 

 1882, 282. Monodonta and Trochus (in part) of authors. 



Animal with 4 pairs of cirri on the epipodial line, besides a number 

 of long and thin filaments. The radula has a narrow central and 

 5 lateral teeth ; jaws are present. 



Shell globose-turbinate. umbilicate or imperforate ; whorls rounded 

 spirally granose-lirate ; aperture subcircular ; outer lip thick, crenu 

 late within ; columella with a tooth or a notch at the base ; operculum 

 with few whorls. 



Distribution. Indian and Pacific Oceania. 



