UMBONIUM-ETHALIA. 457 



nous at the aperture ; base glabrous ; umbilical area covered by a 

 strong calcareous callus, covering nearly two-thirds of the base ; apex 

 frequently eroded, pearly ; aperture oblique, ovate-rotund ; columella 

 thickened ; lip simple, very acute, fragile. Color grayish-blue, with 

 series of brown dots ; columella white ; callus flesh-colored. 

 Alt. 10-13, diam. maj. 14, min. 12A mill. 



Sea of Japan. 



Botella japojiica Sulliotti, Bull. Soc. Mai. Ital. xiv, p. 70, 1889. 



Unfigured and insufficiently characterized. Sulliotti does not 

 compare with the already known Japanese Umhonium with sculpt- 

 ured whorls and beaded suture. 



U. BAiRDii Dall. PI. 60, figs. 5. 6. 



Shell small, depressed, conic, white, polished, externally porce- 

 laneous, internally slightly nacreous ; nucleus globular, dextral, ; 

 whorls 5 or more ; radiating sculpture of occasional faint impressed 

 incremental lines; spiral sculpture of occasional microscopic striae, 

 and a single strap-like band appressed to the suture, and bearing 

 numerous flattish squarish nodules or elevations, which coronate the 

 whorls; periphery rounded, base rounded, depressed in the center, 

 which is nearly filled with a mass of white callus having a very 

 finely granular surface. Aperture ovate, margin simple, thin, 

 oblique. Alt. of axis 82, of shell 4, diam. 5 mill. {Dall.) 



Florida reefs, 200 fms. ; Yucatan Strait, 640 this. 



U. bairdii Dall, ' Blake ' Gasterop., p. 359, t. 21, f 6, 1889. 

 The specimen is not quite adult. 



Genus ETHALIA Adams. 



Ethalia A. Adams, Proc. Zool. Soc. Lond. 1853, p. 189. Type, 

 Umbonium guamense Q. & G. (Rotella). — H. & A. Ad., Genera 

 Rec. Moll., p. 409. — Fischer, Manuel, p. 822. — Liotrochus 

 Fischer, Journ. de Conchyl. 1878, p. 207. 



• I have here used Ethalia in its original sense, for the species 

 grouping immediately around E. guamense Quoy. I am convinced 

 that to these it should be restricted. The species are moderate-sized 

 shells, somewhat between Umbonium and Chrysostoma in texture, 

 depressed, the whorls convex, with a mottled or streaked color- 

 pattern. The callus emitted at the columellar-parietal angle of the 

 aperture is tongue-shaped, closing the umbilicus except a rather 



