UMBONIUM. 45o 



U. THOMASi Crosse. PI. r>7, figs. 31, 32. 



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

 yellowish, with close, numerous, narrow, radiating reddish or bluish- 

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

 just below the })eriphery ; 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 surflice. Surface apparently smooth and polished, but 

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

 incised lines and oblique stride of exquisite fineness. Whorls 65, 

 plane, apex acute ; base ffat, central callus smaller than in U. vestiar- 

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

 ending in a point below\ 



Alt. 9. diam. 12'^ mill, (specimen) ; alt. 9, diam. 18 mill. 

 ( Crosse.) 



Hahodadi, Japan; Northern China. 



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

 f. 8. — Umboni'um thomasi Crosse, Dkr., Ind. Moll. Mar. Jap., p. 135. 

 Rotella infraplanata 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 sculjjture 

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

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

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

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

 oblique lines. 



iiowerhy'' a Rotella infrap la) lata (lA. 58, figs. 10, 11, 12) seems to 

 have no diflerential 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 wdth blackish-brown or purple ; base a little 

 more convex ; under a lens finely transversely and longitudinally 

 striate. (Dkr.) 



Japan. 



U. adamsi 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. 



