GIBBERULA. 43 



M. JEWETTII, Carpenter. PL 12, fig. 57. 



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



Monterey to Santa Barbara, Ual. 



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



Like M. Jewettii, but much shorter and wider. 

 Length, -14 inch. 



Santa Barbara, Gal. 



M. REGULARIS, Carpenter. PL 12, fig. 56. 



Thin, glassy white or yellowish; narrower than M. Jewettii; 

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



Monterey to San Diego, Oal.; 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. in fan a, Reeve, and the outline 

 more convex below. M. Crossei, Velain (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. GLANDJNA, Yelain. 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 cylindrical 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. minvta, Pfr. , but 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 Indies, Florida. Fossil 



in the Fost Pliocene of Southern Europe. ' 



