PLUTONIA, TRIGONOCHLAMYS. 161 



V. TONGANUS, Quoy. PI. 35, fig. 25. 



Imperforate, striulate, fragile, pellucid, carinate, whitish 

 corneous ; whorls 6, the last subimpressed at the base. 

 Diam. 7, alt. 5 mill. 

 Ins. Tonga Taboo (Quoy); Ins. Negros, Philippines (Cuming). 



Y. DISCOIDEUS and y. TURRITUS, Semper. Unfigured. 



Ins. Luzon, Philippines. 



Genus PLUTONIA, StabLe, 1864. 



P. ATLANTICA, Morelet and Drouet. PL 35, fig. 28 ; PL 29, figs. 



75, 76. 



Animal reddish brown or chocolate-color ; mantle finely 

 shagreened, lighter colored over the shell, sometimes with large 

 patches of bluish color, neck with yellowish blotches on either 

 side, sole sepia-colored with minute dark spots. Length, 1 inch. 



Shell ancyliform, oblong, planate, somewhat rugose, longitu- 

 dinally costulate, brownish ; spire short, lateral, posterior, apex 



whitish. 



San Miguel, Azores. 



Genus TRIGONOCHLAMYS, Bottger, 1881. 



T. IMITATRIX, Bottger. PL 35, fig. 29. 



Animal blackish above, sole ash-colored in the middle, 

 blackish on the sides. Length, 3-4 inches. 



Caucasus. 



Subgenus PSEUDOMILAX, Bottger, 1881. 



T. LEDERI, Bottger. PL 35, figs. 30, 31. 



Whole animal blackish. Length, 23 mill. 



Kutais, Transcaucasia. 

 T. BICOLOR, Bottger. PL 36, figs. 38, 39. 



Animal blackish above, the carina and margins of the shield 

 lighter, sole yellowish. Length, 4'5 mill. 



Lenkoran, Caspian Sea. 



T. RETOWSKI, Bottger. Unfigured. Caucasus. 



11 



