GIBBERULA. 43 



M. Jewettii, Curpenter. PL 12, fig. 51. 



Milk-white ; columella four-plaited. Length, 4-5-6 mill. 



Monterey to Santa Barbara, Cal. 



M. STJBTRIGONA, Carpenter. PL 12, fig. 55. 



Like Jf. Jeicettii, but much shorter and wider. 



Length, '14 inch. 



Santa Barbara, Cal. 



M. REGULARis, Carpenter. PL 12, fig. 5(). 



Thin, glassy white or yellowish; narrower than 71/. Jewettii; 

 lip-margin rather thick. Length, -13 inch. 



Monterey to San Dieao, Cal.; beach to 20 fms. 



M. LACHRYMA, Reeve. PL 12, figs. 53, 54. 



Pyriformly ovate, glassy white ; columella with four plaits, 



and several denticulations above them. Length, 4 mill. 



Borneo. 



The spire is shorter than in M. ivfans, Reeve, and the ontline 



more convex below. M. Croi^sei, Ye'lain (fig. 54), from the 



vicinity of the Islands of St. Paul and Amsterdam, does not 



appear to differ except in size, being 1-5 mill. ; it is perhaps not 



fully grown, 



M. GLANDINA, Velaiu. PL 12, fig. 58. 



White, columella with two strong plications and three slighter 

 ones above them. Length, 2-75 mill. 



Island of St. Paul, Indian Ocean. 



Scarcely distinguished from the preceding species by a some- 

 what more C3'lindrical form. 



M. GRANUM, Phil. 



Shell minute, obovate, white, spire shortly conical ; columella 

 straight, four-plicate, lip sulcate-striate within. Length. 4 mill. 



Red Sea, near Aden. 



Like M. mivvto, Pfr., bnt slightly larger; lip strongly 8-10 

 sulcate within. Not figured. 



M. MiNUTA, Pfr. PL 12, figs. 60-63. 



White, columella four-plaited, lip minutely denticulated within. 

 Length, 2-5 mill. 



Mediterranean., Red Sea, West Ind/ex, Florida. Fossil 



in the Post Pliocene of Southern Europe. 



