1 60 THALA. 



one of those eases where the dentition would be of much collat- 

 eral value. I have preferred to retain all the species in Mitridae 

 rather than attempt to divide them upon insufficient data. 



T. FOVEATA, Sowb. PI. 47, fig. 356. 



Cancellated, chocolate-brown. Length, *5 inch. 



Hab. unknown. 

 T. ROSEATA, A. Ad. PI. 47, fig. 357. 



Cancellated, pinkish white. Length, -4 inch. 



Hab. unknown. 

 Yery closely allied to T. foveata. 



T. SOLITARIA, C. B. Ad. PI. 47, fig. 358. 



Cylindrically fusiform, cancellated, brown. Length, '4 inch. 



Panama. 

 A single specimen obtained by the discoverer ; I have not 

 heard of its being found since. 



T. EXiLis, Reeve. PI. 47, fig. 359. 



Violet-purple Avith a darker band ; granosely decussated 

 throughout with minute ridges. Length, "66 inch. 



Isle of Ticao, Philippines ; under stones at low water. 



T. TODiLLA, Mighels. PI. 47, fig. 360. 



Whitish or light violet, sometimes obscurely banded or 

 spotted ; surface tuberculately cancellated. Length, '35 inch. 



Sandwich Islands. 



Described as a Pleurotoma, the columellar plaits being indis- 

 tinct. 



T. MILIUM, Reeve. PI. 47, fig. 361. 



Chestnut-brown, cancellated. Length, -35 inch. 



Hub. unknown. 



The figure is somewhat different from that of T. todilla, yet it 

 may be that species. 



T. RECURVA, Reeve. PI. 47, fig. 362. 



Pinkish or violet, minutely dotted here and there with brown; 

 longitudinally sculptured, tranversely impressly striate. 



Length, -35 inch. 



Island of Capul, Philippines ; under stones at low water. 



Certainly very closely allied to T. todilla. 



