452 • UMBONIUM. 



U. SAGITTATUM Hillfls. PI. 59, fig. 47. 



Shell smaller, more depressed than U. vestiarium, fawn or flesh- 

 colored, with a row of arrow-shaped dark spots at the periphery., and 

 another a short distance below the suture ; whorls about 41, rapidly 

 widening, the last depressed; spire lower than in U. vestiarium; 

 basal callus convex, circular, smaller than in vestiarium. Surface 

 perfectly smooth and polished. Alt. 4, diam. 6 mill. 



Straits of Macassar. 



Rotella sagittata Hinds, Zool. Voy of the Sulphur ii, p. 52, t. 16, 

 f. 18, 19. — SowERBY, Thes. Conch, v, p. 137, f 9; in Conch. Icon. 

 XX, f. 9. — Globulus sagittatus Hinds, Phil. ConcKyl. Cab., p. 49, t. 

 7, f. 13, 14 (copied from Hinds). — Globulus articulatus Philippi, 

 loc. cit, p. 49, t. 7, f 24, 25. 



Spire more depressed than U. vestiarium. and coloration so far as 

 I know constantly as above described. The callus is smaller and 

 rounder than in vestiarium, and either white or slaty colored. 



U. coNicuM Adams et Reeve. PI. 59, figs. 45, 46 ; pi. 58, fig. 15. 



Shell conic with flat base, polished, smooth, thin but solid; dark 

 jjurple, unicolored Avith reddish apex, or with an opaque white band 

 on the lower part of each whorl, or with the entire upper surface of 

 the two outer whorls white, the base purple ; spire conical, lateral 

 outlines straight ; whorls 6, rather slowly widening, the last rounded 

 at periphery, flat below, or a trifle concave around the rather small, 

 circular, dark central callus ; aperture subquadrate, iridescent in- 

 side ; columella short, oblique, very thick and heavy, with a little 

 nick in the edge near its base, and a slight notch where it is inserted 

 upon the basal callus pad. Alt. 5, diam. 7 mill. 



Mouth oj Lundu River, Borneo; Uiinaseas. 



Rotella conica Ad. and Rve., Zool. H. M. S. Samarang, Moll., p. 

 49, t. 11, f 22, 1850.— SowERBY, Thes. Conch, v, p. 136, f 10; in 

 Reeve, Conch. Icon., f. 1. 



The coloration is peculiar ; a beautiful iridescence glows through 

 the purplish outer coat of the upper whorls. The conical form, flat 

 base, and peculiarly nicked columella, together with the polished 

 surface, smooth excejit for fine, imjjressed lines of increment, are 

 diagnostic. U. thomasi Crosse, is larger and quite differently colored 

 and sculptured. 



