122 CANTHARIDUS. 



revived it in 1840 for Trochus iris. lu this uncertainty I prefer to- 

 adopt Cantharid'us of Montfort. 



Subgenus Cantharidus, Montfort. 



Section Cantharidus Montf. (restricted). 



C. IRIS Gmelin. PI. 34, fig. 15. 



Shell imperforate, elevated-conical, obtusely angular at the pe- 

 riphery, solid, but not very thick, whitish, tinged with blue on the 

 body-whorl and yellowish or pinkish on the spire, all over closely 

 longitudinally marked with undulating purplish-red streaks, often 

 zigzag, or interrupted into spiral series of articulations ; spire with 

 slightly concave outlines, slender, more or less eroded and showing 

 the iridescent green nacre at tip ; sutures linear ; whorls 8-9, 

 generally showing traces of spiral impressed lines, base with about 

 5 spiral separated narrow ridges, often inconspicuous ; aperture 

 ovate-rhomboidal, oblique, lined with iridescent green nacre with 

 red reflections; outer lip thin, slightly sulcate within; columella 

 subvertical, generally straight in the middle or slightly projecting, 

 pearly above; parietal wall eroded, brilliant green; umbilico-colu- 

 mellar patch whitish. Alt. 40, diam. 30, mill. 



Mew Zealand. 



Oj)aIm Martyn, Univ. Conch., t. 24. — T. irisGMEL. Syst. Nat., 

 xiii, p. 3580. — Lam., An. s. Vert, vii, p. 27. — Philippi, Conchyl. 

 Cab., p. 9, t. 2, f 7, 8 ; t. 46, f 9.— Woodward, Manual of the Moll., 

 t. 10, f 8. — Fischer, Coq. Viv., p. 157, t. 51, f 4. — Cantharidus iris 

 HuTTON, Man. N. Z. Moll, p. 99 (1880). 



The largest species of the genus. Specimens with the outer coat 

 ground off show a beautifully iridescent green nacre. 



C. PRuiNiNus Gould. PI. 46, figs. 60, 61. 



Shell ovate-conical, imperforate, rather solid, deep purple (some- 

 times with a few white dots), apex pink ; surface nearly smooth, 

 very densely finely spirally striate all over ; spire conical, apex sub- 

 acute ; whorls about 6, slightly convex, the last rounded or very 

 obtusely angular ; aperture less than one-half the length of shelly 

 ovate, oblique, iridescent within and showing fine dense folds in the 

 nacre; columella subhorizontal, straightened in the middle, ex- 

 panded in a callous pad over the umbilicus. 



Alt. 22, diam. 16 mill. ; alt. 30, diam. 19 null.; alt. 19, diam. 16 

 mill. 



AucJdand and Campbell Is. 



