460 ETHALIA. 



lip scarcely covers the axis, leaving often a slight pit. Well-pre- 

 served specimens show red and emerald-green reflections through 

 the thin layer overlying the nacre, like fiery opals. The radiating 

 stripe?*, compressed last whorl, and biangular periphery easily distin- 

 guished this shell. Four names were proposed for this shell and 

 published at about the same time in 1854. I have no means of 

 knowing which has priority, but am inclined to prefer Hombron's to 

 Adams', as it was accompanied by good figures. The title page of 

 Philippi's monograph is 1853, but the actual date of issue is very 

 uncertain. 



E. STRIOLATA A. Adams. PI. 58, fig. 21. 



Shell discoidal, subglobulose, subperforate, transversely striate ; 

 whorls 5, slightly convex ; ornamented with very narrow transverse, 

 white articulated, lines ; base smooth, reddish-brown maculated at 

 periphery, with a reddish zone around the umbilical region ; callus 

 white, small, partly concealing the umbilicus ; aperture oval. (Ad.~) 



Borneo. 



Umbonium (Ethalia*) striolatum A. AD., P. Z. S. 1853, p. 189. 

 Rotella striolata Ad., SOWB., Conch. Icon, xx, f. 13; Thes. Conch, 

 v, p. 137, f. 18.^. trilobata SOWERBY, Conch. Icon., f. 20; Thes. 

 Conch., f. 14. 



Var. TRILOBATA Sowb. PI. 58, fig. 20. 



Shell pale olive-gray, subdepressed, variously painted with spots 

 and stripes ; whorls rather convex above ; umbilicus funnel-shaped ; 

 callus small, divided into three semicircular parts. Resembles E. 

 striolata in form of callus, but is more pronounced. In rotundity of 

 whorls the species is midway between the latter and E. guamen.se. 

 (Sowb.) 



E. PULCHELLA A. Adams. PI. 59, figs. 59-63. 



Shell sublenticular, obtusely angulated, umbilicate, smooth, shin- 

 ing, grayish-straw colored, above with little pale greenish-brown 

 angular lines often confluent into wider streaks, below painted with 

 white spots ; spire a little prominent, apex a little acute, whitish ; 

 base around the umbilicus rather broadly, perspe.ctively, radiately 

 corrugated and angulate ; aperture subrhomboidal, very oblique, 

 throat pearly ; peristome straight, obtuse, whitish, basal margin 



