CALLIOSTOMA. 333 



of tliem small ; on the base there are about 8 concentric rido-es, 

 scarcely beaded except the two or three inner ones ; spire conical, 

 much broader than usual in Calliostoma ; sutures slightly impressed ; 

 whorls about 6, nearly flat, the last obtusely angled at the j^eriphery ; 

 base rather flattened. Aperture rounded quadrangular, very similar 

 in shape to that of G. punctulatum, nacreous, iridescent and sulcate 

 within ; columella pearly, arcuate. Alt. 35, diam. 37 mill. 



Auckland; Chatham Is^ 



Ziziphimis spedahills A. Ad., P. Z. S. 1864, p. 37, t. 27, f. 7. 



Eeeve, Conch. Icon., f. 5. — Hutton, Proc. Linn. Soc. N. S, W. ix, 

 p. 360, 1884. 



This species has a more robust heavy spire than any other allied 

 foi'm. The sculpture is coarse. 



C. TIGRIS Marty n. Vol. X, PI. 41, fig. 30. 



Shell large, conical, imperforate, solid but rather thin, lioht 

 yellowish, longitudinally painted with numerous rather narrow ir- 

 regular chestnut-reddish stripes. Surface of embryonic whorls 

 smooth, the others encircled by numerous delicate, finely beaded 

 liruljB, which on the penultimate whorl number about 16-20 ; on the 

 upper surface of the body-whorl there are 18-25. The spire is 

 elevated, its lateral outlines concave above ; sutures a little impressed. 

 Whorls 10-12, those of the spire flattened, the last convex, rounded 

 at the periphery. The aperture is rhomboidal, iridescent within ; 

 columella arcuate, pearly, bluntly tuberculate at base. 



Alt. 59, diam. 58 mill. ; alt. 45, diam. 45 mill. 



Auckland to Cook's Sts., N. Zealand ; Chatham Is. 



Trochus tlgris Martyn, Univ. Conch, ii, t. 75 (1784). — Gmel. 

 Syst. Nat. xiii, p. 3585.— Philippi, Conchyl. Cab., p. 50, t. 10, f. 

 16, 17. — Ziziphimib tlgris Mart. Reeve, Conch. Icon., f. 4. — Grana- 

 tum. Chemnitz, Conchyl. Cab., v, p. 100, f. 1654, 1655. — Trochus 

 granatum Lam., An. s. Vert, ix, p. 145. — Chenu, Manuel, f 2551. — 

 Fischer, Coq. Viv., p. 69, t. 15, f. 1. — Zizip)hinus granatum Chemn., 

 Hutton, Proc. Linn. Soc. N. S. ^\. ix, p. 360, 1884. 



This tawny striped trochus, well named Tiger Trochus, differs 

 from the other species in its coloration. The perij^hery is less angular 

 than that of selectum, but not so rounded as in C. punctulatum. 

 The granulation is fine and even, not obsolete on the outer part of 

 the base. The name proposed by Chemnitz is not binomial, and 

 cannot be adopted in preference to Martyn's. 



