450 DANILIA-UMBONIUM. 



There is a large number of fossil (Cretaceous and Tertiary) species 

 of Danilia ; for these, see Ryckholt, Catalogue des especes du genre 

 Craspedotus, in Journ. de Conchyl. 1862, p. 413. 



Genus UMBONIUM Link, 1807. 



Umbonium LINK, Beschr. Rostock Samml., p. 136. A. ADAMS, 

 Monograph in Proc. Zool. Soc. 1853, p. 187. H. and A. AD., 

 Genera Rec. Moll, i, p. 407. Globulus SCHUMACHER, Essai d'un 

 Nouv. Syst., 1817. PHILIPPI, Monograph in Kuster's Conchylien 

 Cabinet. Rotella LAMARCK, Animaux sans Vertebres vii, p. 6, 

 1822, and of most authors. Helidna GRAY, Proc. Zool. Soc. Lond. 

 1847, p. 145, not of Lamarck. Pitonellus and Pitonillus MONTFORT. 

 Conch. Syst. ii, p. 170, 171. Ptychomphalus AGASSIZ, in part, 1837, 



A group of elegantly painted shells, the prominent characters of 

 which are the depressed form, polished surface, thin internal nacreous 

 layer, and very heavy pad of polished callus covering and filling the 

 umbilicus. The operculum is horny, fragile, with very numerous 

 narrow whorls. The species range from Japan to Singapore, Philip- 

 pines, etc., westward to Ceylon. A single little species has been 

 dredged by the U. S. steamer ' Blake ' in the Gulf of Mexico. 



Schema of oriental species. 



A. Species with the tipper surface smooth, not sulcate. 

 a. Conical above, base flat, conicum, thomasi, adamsi. 

 aa. Convex above and below, vestiarium, callosum, sagittatum, 



[giganteum. 



AA> Upper surface spirally sulcate, costatum, superbum, suturale, 



[moniliferum, japonicum. 



U. VESTIARIUM Liiine. PL 58, figs. 1-8. 



Shell depressed, thin but strong, shining, polished, smooth ; spire 

 low but conical ; whorls about 6, flat, the last usually a little de- 

 pressed below the linear sutures, rounded at periphery, a little con- 

 vex beneath ; callus pad large, convex, thick ; aperture subtri- 

 angular, iridescent within. Alt. 10, diam. 15 mill. 



Indian Ocean, Madras and Ceylon to Java, Philippines, Singapore, 

 New Ireland. 



Trochus vestiarius LINN., Syst. Nat. x, p. 758. Rotella lineolata 

 LAM., An. s. Vert., vii, p. 7. KIENER, Spec, et Icon., Genre Rou- 

 lette, p. 3, t. 1. Rotella elegans BECK in KIENER, L c., p. 4, t. 3, 



