112 MONODONTA. 



The reticulated color-pattern will distinguish this species from 

 the preceding. 



M. zi:us Fischer. PI. 22, figs. 58-60. 



Shell imperforate, thick, obtuse ; apex short, papillose, yellowish ; 

 suture impressed; whorls 4 to 5, moderately convex, obliquely 

 striate. spirally silicate; last whorl ample, rounded, obsoletely 

 angulated above, marginated at the suture, white, with radiating 

 flexuous red lines; base convex; aperture circular, colurnella sub- 

 dentate at base ; columellar callous thick, wh itish -green ; outer lip 

 thick. Alt. 16, diam. 19 mill. (Fischer.) 



Habitat unknown* 



TrocJius zeus FISCHER, Journ. de Condi., 1874, p. 372, et C'oq.Viv., 

 p. 834, t. 104, f. 1. 



I have not seen this species, which was described from several 

 specimens of unknown origin, all of the same form and color-pattern. 

 Dr. Fischer considers the green columella an indication that it is 

 from Australia, where numbers of the Trochidie exhibit this char- 

 acter. The species seems to be more nearly allied to M. crinita 

 Phil, and other species of Chlorodiloma than to typical Monodonta. 



Section OXYSTELE Philippi. 



Oxystele PHIL., Zeitschr. f. Mai., 1847, p. 19; Handbuch der 

 Conchy 1., p. 210. H. and A. AD., Gen. Rec. Moll., p. 426. FISCHMR, 

 Manuel, p. 820. TRYON, Struct, and Syst. Conch., ii, p. 314. 



M. MERULA Lamarck. PI. 23, fig. 79. 



Shell rather depressed conoidal, imperforate, lusterless purplish- 

 black ; spire conical, apex eroded, yellowish, the following whorl 

 spindly striate, the last two whorls smooth ; whorls about 6, convex ; 

 sutures distinct ; last whorl not carinated at the periphery, rather 

 flattened on the base, and usually slightly eroded in front of the 

 aperture ; aperture large, oblique, the outer lip black-margined, 

 within silvery, the nacre smooth, but apparently lirate ; columella 

 arcuate, thin, simple, white ; umbilico-columellar region surrounded 

 by a beautiful rose-colored tract. Alt. 27-40 ; diam. 35-41 mill. 



Cape Region, S. Africa. 



Trochus merula LAM., An. s. Vert., vii, p. 16 (1822). PHILIPPI, 

 Conchyl. Cab., p. 26, t. 6, f. 3, 4. KRAUSS, Die Sudaf. Moll, p. 95. 

 FISCHER, Coq. Viv. (Turbo), p. 182, t. 29, f. I. Trochus sinensis 

 GMEL., Syvt. XaL, xiii, p. 3583. 



