UMBONIUM. 453 



TJ. THOMAS: Crosse. PL 57, figs. 31, 32. 



Shell conical, the base nearly flat ; light fawn-color, whitish or 

 yellowish, with clo.se, numerous, narrow, radiating reddish or bluish- 

 brown stripes above, often interrupted by an ill-defined light zone 

 just below the periphery; sutures linear, narrowly margined with a 

 reddisli line, becoming blackish on the last whorl; base with a dark 

 streak around the callus, and radiating lines or stripes colored like 

 the upper surface. Surface apparently smooth and polished, but 

 under a lens seen to be very densely, finely decussated all over by 

 incised lines and oblique stria3 of exquisite fineness. Whorls 6, 

 plane, apex acute ; base fiat, central callus smaller than in U. vext'xir- 

 ium, nearly flat, roughened, thickest on the columellar lip ; columella 

 ending in a point below. 



Alt. 9. diani. 12-} mill, (specimen); alt. 9, diam. 18 mill. 

 (Crosse.) 



Hakodadi, Japan; Northern China. 



Globulus thomasi CROSSE, Journ. de Conchyl. 1863, p. 384, t. 13, 

 f. 8. UmbrmhiM thomax! Crosse, DKR., Ind. Moll. Mar. Jap., p. 135. 

 RoteUn infra jttamtta SOWB., Thes. Conch, v, p. 136, f. 11-13; and in 

 Conch. Icon, xx, f. 10. 



May be known by the conical form, flat base, decussated sculpture 

 and the color pattern. The specimens from which the above descrip- 

 tion is drawn are labeled New Caledonia; whether correctly or not 

 I cannot say. Crosse describes a variety which is rosy-white ; suture 

 rose-colored ; longitudinally painted with pale blackish, flexuous, 

 oblique lines. 



Sowerby's Rotella infraplanata (pi. .58, figs. 10, 11, 12) seems to 

 have no differential characters. 



U. ADAMSI Dunker. PI. 58, figs. 26, 27, 28. 



Shell depressed-conoid, shining, glabrous, whitish, closely painted 

 with undulating blackish-brown lines ; whorls plano-convex, the last 

 obtuse; base nearly plane; callus thick, ashen-white. A shell allied 

 to the preceding, but distinguished by being smaller, alt. 6, diam. 12 

 mill., closely lineolate with blackish-brown or purple ; base a little 

 more convex ; under a lens finely transversely and longitudinally 



striate. (Dkr.) 



Japan. 



U. ftdamsi DKR., Ind. Moll. Mar. Jap., p. 135, t. 6, f. 3, 4, 5 ; Mai. 

 Bl. xxiv, p. 74. 



Seems to differ but slightly from the preceding. 



