UMBONIUM. 455 



Rotella costata Val., in Kiener, Spec, et Icon. Gov. Viv., p. 10, 

 t. 2, f. 5. — Globulus costatus Val., Phil., Conchyl. Cab., p. 51, t. 7, 

 f. 15.— U7nbonimn costatum Val., A. Ad., P. Z S. 1853, p. 188.— 

 DuNKER, lud. Moll. Mar. Jap., p. 184. 



Sometimes nearly equal to XT. giganteum in size, but usually not 

 exceeding 18 mill. diam. The strongly costate upper surface will 

 distinguish this shell from the preceding forms. The suture is not 

 so deeply impressed, nor has it so prominent a margin as in U. 

 suturale. The tessellated color-markings sometimes form subcon- 

 tinuous oblique bands. 



U. suPERBUM Gould. PI. 57, figs. 33-36. 



Shell large, solid, depressed-conic, shining, brownish-green ; whorls 

 7, the apical smooth, the following 4-sulcate, interspaces tessellated 

 with whitish lines ; base convex, whitish, ornamented with a green 

 articulated zone ; callus copious, full, reddish tinted ; aperture 

 rotund-ovate; columella thickened. Alt. 15, diam. 20 mill. (Gld.) 



The five examples before me are smaller than U. costatum with the 

 same number (7) of whorls; they measure 17-18 mill, diam., costa- 

 tum being often larger; they have moreover a more acute ajjex, the 

 first whorls are much steeper, more rectilinear in outline, and there- 

 fore the shell is higher and more conic ; the suture is not so deep, the 

 margin under it much weaker, sometimes scarcely visible, while that 

 of costatum is often very strongly marked. The spiral furrows begin 

 on the 3d whorl, sometimes at its termination, whilst in U. costatum 

 they begin at the embryonic whorl. (Lischke.) 



Nagasaki, Kagnsima, Japan. 



Rotella superba Gould, Proc. Bost. Soc. N. H. viii, p. 17, 1861 ; 

 Otia Conch., p. 156. — Umbonium superbum Gld., A. Ad., Ann. Mag. 

 N. H. xi, p. 265, 1863. — Lischke, Jap. Meeres-Conchyl. ii, p. 83, t. 

 5, f. 18-21.— DuNKER, Ind. Moll. Mar. Jap., p. 134. 



Evidently close to U. costatum Val. I have translated Gould's 

 diagnosis, and the figures and part of the remarks of Liscthke. 



U. SUTURALE Lamarck. PI. 58, figs. 13, 14. 



Shell depressed, solid, strong, with low-conoidal spire, upper and 

 lower surfaces nearly equally convex ; color whitish or pinkish, 

 with numerous, close, oblique, zigzag, radiating purplish-brown lines 

 extending to the purple or crimson basal callus; surface poli.-hed, 

 shining, with a few shallow spiral sulci on the upper surface, 



