i67 



sculpture of the shells is more regular more délicate and consists of closely placed concentric 

 striae. The shell is not so thin as that of D. ethima while the margin is specially thickened. 



Measurements of Holotype : — - Length 9.4 mm., height 8.8 mm., diameter 6.3 mm. 



Habitat: — The unique holotype was dredged at Rumah-Kuda Bay, Roma Island (St. 279). 



It is the species the anatomy of which was found by Pelseneer ^) to differ from the 

 typical species of Diplodonta in the foot being not swollen near the apex, and having very 

 extensive external branchia. 



Family Leptonidae. 



Genus Kellia Turton. 



1822. Kellia Turton, Conch. Insularum Brittan., p. 56. 



1837. Telliinya (section i) Brown, Illustr. Rec. Conch. Great Britain, Ireland, p. 106. 



1857. Kellia Adams, H. & A., Gen. Rec. Moll., II, p. 474. 



1887. Kellya Fischer, P., Man. Conchyhol., p. 1025. 



1900. Kellia Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 1153. 



I agrée with Dall that section I of Tellimya Brown ") is a synonym of Kellia Turton — 

 génotype Kellia suborbiciilaris (Montagu). 



In the "Siboga" collection there is a young shell from St. 164 (i°42'.5 S., i30°47'.5E., 

 32 mètres), which it is impossible to identify specifically. Another single valve from St. 98 

 (6°9'N., i20°2i^E., 350 mètres) resembles Kellia adamsi (Anga.s) ^) from Port Jackson, but the 

 "Siboga" shell is thinner and its sculpture is more strongly developed. 



Family Galeommatidae. 



Genus Galeomma Turton. 



1825. Galeomma Turton, Zool. Journ., II, p. 361. 



1857. Galeomma Adams, H. & A., Gen. Rec. Moll., II, p. 479. 



1868. TIiyreopsisKàams, H., Proc. Zool. Soc. London, p. 14. 



1887. Lepirodes Fischer, P., Man. Conchyliol., p. 103 1. 



1900. Galeomma Dall, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 11 19. 



The génotype of Galeomma is G. hLrtoni (Broderip and Sowerby), and I hâve no doubt 

 that the Deshayesian species angiista and polita are true Galeomma and not species of rhe genus 

 Scintilla, as several authors hâve considered them to be. 



I. Galeomma angusta Deshayes. 



1856. Galeomma angusta and G. chloroleuca Deshayes, Proc. Zool. Soc. London (volume for 



185s), p. 177. 



1857. Galeomma angusta and G. chloroleuca Adams, H. & A., Gen. Rec. Moll., II, pp. 479, 480. 



i) Pelseneer, P. — "Siboga" Lamellibranches (Anat.), p. 41, pi. XIII, fig. 7 (191 1). 



2) Brown, T. — Illustr. Rec. Conch. Great Britain, Ireland, pi. XIV, figs. 12, 13 (1827). 



3) Angas, a. — Proc. Zool. Soc. London, p. 910, pi. XLIV, fig. il (1867). 



