112 MONODONTA. 



The reticulated color-pattern will distinguish this species from 

 the preceding. 



M. ZEUS Fischer. PI. 22, figs. 58-60. 



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

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

 striate, spirally sulcate ; last whorl ample, rounded, obsoletely 

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

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

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

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



Habitat uvkmnvn. 



TrocJiUs zeus Fischer, Jonrn. de Conch., 1874, p. 372, et Coq.Viv., 

 p. 384, 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 cohimella an indication that it is 

 from Australia, where numbers of the Trochid?e 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. 



Oxijsteh Phil,, Zeitschr. f Mai., 1847, p. 19 ; Handbuch der 

 ConchyL, p. 210.— H. and A. Ad., Gen. Rec. Moll., p. 426.— Fischer, 

 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 

 spirally 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 a])parently 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. Vlv. (Turbo), p. 182, t. 29, f 1. — Trochus sinensis^ 

 Gmel., Syst. Nat., xiii, p. 3583. 



