44 ARGOBUCCINUM. 



R. PUSILLA, Brod. PI. 24, figs. 56-58, 66 ; pi. 23, fig. 50. 



Color varying from white, more or less stained with rose 

 (typical) to uniform roseate or rosy with yellow varices (var. E. 

 rosea, Reeve, fig. 58), or. light chestnut with a, median white band 

 (R< concinna, Dunker, fig. 50). Length, 10 to 20 mill. 



Red Sea, Indian Ocean, Philippines, Australia, New Caledonia, 

 Tahiti, Lord Hood's IsL, Sandwich Isles, Natal. 



The intermediate stages of coloration and perfect similarity of 

 appearance of the three species indicated above, justify their union 

 under the oldest published name. R. polychloros, Tapparone- 

 Canefri, agrees well with a variety of R. pusilla from the Sand- 

 wich Islands in Coll. A. N. S. Philada., having a purple-tinted 

 aperture, dirty white exterior surface and chestnut bands. I can 

 scarcely doubt its identity with R. pusilla. It has not been 

 figured. 



R. ANCEPS, Lam. PL 24, figs. 59, 67. 



Pure white ; obsoletely bi-triplicate between the varices, encir- 

 cled by revolving lines. Length, '4 to 1 inch. 



Torres' Straits, Australia ; Japan; Vitiand Sandwich Isles ; 



Panama ; West Indies. 



The above localities have all been duly verified, and notwith- 

 standing the very extensive distribution there does not appear to 

 be any variation in the species. In general appearance it is much 

 like some of the small Tritons of the subgenus Epidromus. 



R. HASTULA, Reeve. PI. 24, fig. 60. 



Chestnut-brown, varices yellowish ; transversely granulately 

 striated. Length, 15 mill. 



lid h. >i iil.-nnicn. 



R. AEGUS, Gmelin. PI. 24, figs. 61-65. 



Longitudinally plicately nod tiled, the nodules being either 

 distant and large or crowded and small ; in the latter case they 

 are scarcely connected by longitudinal ridges, and being rubbed 

 white, upon the brown, banded shell, have given rise to the name 

 of the hundred-eyed monster. Fresh specimens are covered with 

 a closely-wrinkled brown epidermis. Outer lip of shell thickened 

 and coarsely dentate within, sometimes in the adult, developing 



