108 MONODONTA. 



bilicus narrow ; columella arcuate, terminating at base in an obtuse 

 denticle. (Philippi.) 



j he shell is much depressed, with 5'. rapidly widening whorls, 

 which are above flat, the rest convex ; the last is slightly angled, 

 and has above eight equally widely spaced impressed spiral lines, 

 which do not modify the smoothness of the surface. The base also 

 has a pair of impressed lines ; the umbilicus is narrow, the columella 

 arcuate, with a blunt denticle below. The color is black above, 

 brown beneath, both sides guttate with yellowish-white spots ar- 

 ranged in rows. Alt. 3, diam. 5 mill. (Philippi) 



Habitat unknown. 



T. guttatus KOCH, Zeitschr. /. Mai., 1846, p. 104. PHILIPPI, 

 Conchyl. Cab., p. 178, t. 28, f. 4. 



Philippj's description, remarks and figures are copied. 

 M. STURNUS Muhlfeld. PI. 34, figs. 18, 19. 



Shell imperforate, convexo-orbicular, black, ornamented with 

 white-spotted slightly elevated transverse lines; columella very 

 oblique, continued upon the base in a lobe parallel with the lip. 

 {Phil.} 



I have seen two examples of this species, in the Anton collection. 

 The shell is pretty depressed, and seems to consist of only 4 whorls ; 

 these are so flat, and separated by such slightly impressed sutures 

 that one has difficulty in distinguishing them. It is hard to count 

 the elevated transverse lines, they are so inconspicuous. The aper- 

 ture is large, rounded-quadrangular ; the inner lip is, as Muhlfeld 

 correctly says, concave, or rather, surrounded by a little trench, and 

 the basal lip is continued parallel beyond it. The columella is very 

 oblique, compressed, its edge rounded, not acute, and it is continued 

 upon the base in a callous lobe parallel with the outer lip, which has 

 8 to 10 furrows inside, corresponding to the lirse of the outer surface. 

 The color is black, usually with yellow dots on the spiral lira?. 



Alt'. 4'., diam. nearly 8 mill. (Philippi.) 



T. sturmis MUHLF. Mag. Berl. Gesell. nat. Freunde. viii, p. 8, t. 

 2, f. 12. PHILIPPI, Conchyl. Cab., p. 269, t. 39, f. 14. 



Probably a young shell of one of the New Zealand or Australian 

 species. It cannot be from the Antilles, as Muhlfeld supposed. 



M. CONSTE LLATA Souverbie. PI. 35, figs. 9, 10 ; pi. 62, figs. 69-71. 



Shell imperforate, orbiculate-conic, slightly elevated, oblique, the 



base very wide, longitudinally very obliquely subtly striate, and 



