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. 

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

 Sandwich Is. (Garrett) ; Mauritius (Lienard) ; Reunion (Dh.) and 

 Fouquets (Mobius). 



Ballcea guamemis (Bullee Ferussac, on plate) Q. & G., Voy. 

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

 Hydatina guamensis PSE., Amer. Jour. Conch., iv, p. 132. 

 MARTENS & LANGK., Donum Bism., p. 52. Sulla scripta GAR- 

 RETT, Proc. Cal. Acad. Sci., i, 1857, p. 103. / Bullina undulata 

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

 umhita Quoy, GRAY, Figs. Moll. Anim., iv, p. 96, 1850 ; i, pi. 59, f. 

 6 (copied from Quoy). Bulla ferussaci DESH. in Lam., An. s. Vert, 

 vii, p. 57. CATLOW & EVE., Conch. Nomencl., p. 113, 1845. 



Very similar to the West Indian M. undata, but slenderer, alt. 9, 

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

 very weak, generally distinct only on the base. 



M. EXIMIA Deshayes. PL 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 subemarginate be- 

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

 diam. 11, lesser 7 mill. (Z)//.). 



Reunion ; Mauritius. 



Bulla eximia DH., Moll. Keun., 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 synonym of guamensis. 

 Family RING1CULIDJS Meek. 



RingicuJince MEEK, Amer. Journ. Sci., 2, xxxv, pp. 87, 92, (1862). 

 Ringiculidce MEEK, Check-list Inv. Foss. N. A. Cret., pp. 16, 34, 



