MONODONTA. 



M. AUSTRALIS Lamarck. PL 62, figs. 84, 85. 



Shell similar to M. labio, but with rounder whorls, more marked 

 sutures, the lirse lower, not granulose, tessellated with black and 

 <r ravish or greenish ; penultimate whorl subangulate by the prom- 

 inence of its central rib ; columella much less strongly dentate than 

 M. labio, and the notch or canal below it shallow ; basal plicae less 

 developed than in M. labio. Alt. 25, diam. 22 mill. 



Seychelles ; Madagascar ; Cape of Good Hope. 



M. australis LAM., An. sans Vert, vii, p. 35, no. 11 (1822). M. 

 viridis LAM., loc. cit. no. 13. Trochus australis PHILIPPI, Conchyl. 

 Cab., p. 169, t. 27, f. 4, 5. FISCHER, Cog. Viv., p. 227, t, 74, f. 1, 2 

 (not of Quoy et Gurnard). T. melanoehlorus PHIL., Conchyl. Cab., 

 p. 220, t. 33. f. 2. 



Var. VIRIDIS Lamarck. 



Shell dark green, unicolored or nearly so. This is the T. mel- 

 anoehlorus of Philippi. 



M. CANALIFERUS Lamarck. PL 62, figs. 86, 87. 



Shell similar to the preceding, but with more convex, rounded 

 whorls, upon the last of which the spiral lirse become more or less 

 obsolete ; the lirre are more distinct upon the upper whorls, and are 

 smooth, with narrow interstices ; the color is reddish, purplish or 

 green, the lirse usually articulated with white, but sometimes 

 unicolored ; the outer lip is more curved and more finely crenulate 

 within than that of M. labio ; the columella is short, squarely den- 

 tate at base, its edge more or less rugose, and separated from the col- 

 umellar area by a deep narrow straight sulcus, extending from the 

 place of the umbilicus to the notch at base of columella ; basal notch 

 deep, divided by a small denticle in the middle. 



Alt. 21-24, diam. 18-20 mill. 



New Caledonia; Manilla; New Ireland. 



Monodonta canalifera LAM., An. sans Vert, vii, p. 55, no. 12 

 (1822). Trochus canaliferus PHILIPPI, Conchyl Cab., p. 170, t. 27, 

 f. 9, 10. QUOY ET GAIM. Voy. de I'Astrol. t. 64, f. 26-29. FISCHER, 

 Coq. Viv., p. 225, t. 73, f. 2, et var. atramentaria FISCHER, t. 73, f. 3. 

 T.parvus TROSCHEL (in Mas. Berol.) PHILIPPI, Conchyl. Cab., p. 

 175, t. 27, f. 15. 



M. labio has a somewhat similar sulcus parallel to the columella, 

 but is very distinct in sculpture ; M. australis lacks the median tooth 

 of the basal notch or canal and the sulcus upon the face of the col- 



