Calliostoma.} GASTROPODA. 147 



Epidermis thin, very little shining. Spire conical, its lateral outlines 

 slightly concave on the upper part. Protoconch acute, of a few smooth 

 and convex whorls. Whorls 8 to 9, flat, the last slightly convex above, 

 sharply angular at the periphery ; base flat, very little convex. Suture 

 superficial, not very distinct. Aperture subrhomboidal, oblique, pearly 

 and iridescent within, the nacre showing by folds the positions of the 

 principal lira* of the outside. Outer lip sharp, slightly crenulated, 

 sharply angled at the junction with the basal lip, which is also crenu- 

 late, horizontal and slightly convex. Columella arcuate, oblique, 

 slightly pearly. The inner lip spreading as a broad white callus over 

 the umbilical tract, sharply bounded by a circular ridge. 



Diameter, 47 mm. ; height, 37 mm. Diameter, 57 mm. ; height, 

 50 mm. 



Dentition. Hutton, T.N.Z.I., xv, 124, pi. 14, f. L. 



Type (?). 



Hob. Auckland to Cook Strait, not common. Brought to Eng- 

 land by Captain Cook. 



Fossil in the Pliocene. 



5. Calliostoma spectabile, A. Adams, 1855. Plate 40, fig. 5. 



Zizyphinus spectabilis. A. Ad., P.Z.S., 1854 (i, 1855). 37, pi. 27, f. 7. Callio- 

 stoma spectabile, A. Ad., Man. Conch. (1), xi, 332, pi. 16. f. 12; Suter, 

 P. Mai. S., ii, 280. 



Shell large, conical, solid but rather thin, imperforate, flesh- 

 coloured. Sculpture consisting of spiral coarsely granose ribs, 7 to 8 

 on the penultimate whorl, the 2 lowest of them small ; on the base 

 there are about 8 to 10 concentric ridges, the inner 2 or 3 of them 

 only are distinctly beaded. Colour flesh or yellowish, dotted with 

 reddish-brown on the spiral ribs, more distinct upon the base. Epi- 

 dermis very thin, not shining. Spire conical, much broader than 

 usual in the genus. Protoconch small, pointed, consisting of 2 whorls, 

 the first smooth, the second with 2 spiral and distant radiate riblets. 

 Whorls 8 to 9, slightly convex, the last obtusely angled at the peri- 

 phery ; base flatly convex. Suture slightly impressed. Aperture 

 rounded quadrangular, nacreous and reddish iridescent within, broadly 

 and strongly sulcate. Outer and basal lip sharp, slightly crenulate, 

 edged within by a thin callosity. Columella arcuate, slightly pearly. 

 Inner lip forming a narrow white callosity, spreading from the um- 

 bilical tract to the base of the columella. 



Diameter, 42 mm. ; height, 43 mm. Diameter, 37 mm. ; height, 

 35 mm. 



Type in the British Museum. 



Hob. Auckland Islands (Dr. H. Krone, Captain Bollons) ; Chat- 

 ham Islands (fide Pilsbry) ; Foveaux Strait, in 18 fathoms (Captain 

 Bollons). 



A rare shell in collections. 



Fossil in the Miocene. 



