MICROMELO. 393 



is white, translucent, traversed by three well-defined narrow black 

 lines, which are equally spaced and a little obliquely transverse. At 

 right angles with these are about 10 longitudinal strongly and ir- 

 regularly waved lines of the same color. Length 5, breadth 3 lines. 

 Agagna, Island of Guam. Marianne group (Freycinet) ; Hilo, 

 ■Sandivich Is. (Garrett) ; Mauritius (Lienard) ; Reunion (Dh.) and 

 Fo'uquets (Mobius). 



Bidkea guamensis {Bullee Ferussac, on plate) Q. & G., Voy. 

 rUranie et'la Physicienne, Zool., p. 423, pi. 66, f. 10, 11, 12 (1824). 

 — Hydatina guamensis PsE., Amer. Jour. Conch., iv, p. 132. — 

 Martens & Langk., Don una Bism., p. 52. — Bulla scripta Gar- 

 rett, Proc. Cal. Acad. Sci., i, 1857, p. 103. — f Bullina undnlata 

 Brug., Ferussac, Tab. Syst., p. xxx (no description). — Bullinula 

 undata Quoy, Gray, Figs. Moll. Anira., iv, p. 96, 1850 ; i, pi. 59, f. 

 6 (copied from Quoy). — Bulla feriissaci Desh. in Lam., An. s. Vert, 

 vii, p. 57. — Catlow & Rve., Conch. Nomeacl., p. 113, 1845. 



Very similar to the West Lidian 3f, undata, but slenderer, alt. 9, 

 diara. 6 mill., and the markings black, not red ; spiral striation 

 very weak, generally distinct only on the base. 



M. EXiMiA Deshayes. PI. 59, figs. 18, 19. 



Shell ovate-oblong, subcylindrical, thin, pellucid, whitish-roseate, 

 peculiarly ornamented with blackish-brown longitudinal wavy hair 

 lines, and two distant transverse interrupted lines; spire very short, 

 obtuse ; whorls 3, narrow, joined by a linear suture, the last whorl 

 large, smooth in the middle, obsoletely striated in front ; aperture 

 large, dilated in the front part, narrower and subemargiuate be- 

 hind; columella thin, white, deeply arcuate. Alt. 13, greater 

 diam. 11, lesser 7 mill. {Dh.). 



Reunion ; 3Iauritius. 



Bulla eximia Dh., Moll. Reun., p. 55, pi. 7. f. 23, 24 (1863).— 

 Lienard, Cat. Faun. Mai. Maurice, p. 53. — Hydatina eximia 

 Martens, Mobius' Reise n. Maurit., p. 304. 



This form is probably a variety or synouym of guamensis. 



Family RINGICULID^ Meek. 



Ringiculince Meek, Amer. Journ. Sci., 2, xxxv, pp. 87, 92, (1862). 

 — Ringiculidoi Meek, Check-list Inv. Foss. N. A. Cret., pp. 16, 34, 



