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This new species of Danilia differs (according to the figures) so much in shape, size and 

 sculpture from D. Tinci and D. affinis, that it seems superfluous to make an exact comparison. 

 I have the pleasure to name it after the leader of the expedition. 



Fam. Umboniinae. 

 Umbonium Link. 

 i. Umbonium dcprcssum Adams. 



A. ADAMS. Proc. Zool. Soc. Lond. 1853, p. 188. 



REEVE. Conch. Ie. Vol. XX, Rotella, fïg. 2. 



PlLSBRV. Man. of Conch. Vol. XI, p. 451, PI. 58, fïg. 24, 25. 



Stat. 323. Sangkapura-roads, Bavvean-island. 12 M. Mud. 1 Spec. 



Not wishing to decide the question, if U. depressum is a good species, or merely a 

 vaiïety of U. vestiarum Lin., I have left to this single specimen the name applied by Adams. 

 It is only an empty shell, so I was unable to look for differences in the raclula. 



Ethalia Adams. 

 1. Ethalia guamensis Quoy and Gaimard. Fig. 3. 



Quov & Gaimard. Voy. de 1'Astrolabe. Zool. Vol. III, p. 267, PI. 61, fig. 32, 3^. {Rotella). 



KlENER. Coq. Viv. Rotella, p. 7, PI. 2, fig. 18. 



FlSCHER. Coq. Viv. Vol. X, Trochus, p. 378, PI. 115, fig. 3 {callosus). 



REEVE. Conch. Ie. Vol. XX, Rotella, fig. 18. 



PlLSBRY. Man. of Conch. Vol. XI, p. 45S, PI. 59, fig. 38, 39; PI. 57, fig. 41, 42. 



Stat. 37. Sailus Ketjil, Paternoster-islands. Up to 18 M. Coral and coralsand. 2 Spec. 



Stat. 184. Kampong Kelang, South coast of Manipa-island. 36 M. Coral, sand. 2 Spec. 



Stat. 240. Banda. 9 — 36 M. Lithothamnion-bank. 18 Spec. 



Stat. 279. Rumah-Kuda-bay, Roma-island. 18 — 45 M. Mud and sand. 1 Spec. 



In nearly all the specimens the callus is white, only in that from Stat. 37, it is light 

 pink; those from Banda are generally dark-coloured at the upper surface. The species was not 

 yet mentioned from the Archipelago. 



The radula has not yet been described, as far as I know. The teeth, especially those 

 of the central part are very thin and transparent, without distinct cusps; the rhachidian tooth 

 (R) is broadly winged, bow-shaped, at its upper part it is thickened, but I cannot detect a true 

 cusp, the first (1), second (2), third (3) and fourth (4) laterals are about equal in shape, the 

 first one is subtriangular, with a slightly concave innc and convex outer margin, thickened at 

 its upper part, the second is very similar, the third is narrovver and the fourth is more sub- 

 quadrangularly elongate; the fifth (5) or last lateral is club-shaped, thickened above, without 

 cusp. Of the uncini (U) the proximal one has a short, broad cusp, with a small denticle near 

 the base of the distal margin ; the second is more elongate, also with a small denticle ; the 



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