EMARGINULA. 255 



Smaller, more elevated and more recurved than E. rosea. Nu- 

 merous specimens of this form before me show no transition into 

 the form called rosea. I am therefore inclined to consider the 

 Mediterranean and Atlantic shells specifically distinct. There can 

 be no doubt that this is the E. conica of Schumacher, no other spe- 

 cies at all resembling it. 



E. SOLIDULA Costa. PL 64, figs. 9, 10, 11. 



Small, conical, apex shortly recurved, situated at the posterior 

 sixth of the length ; front slope convex, back slope subconcave, 

 equalling half the width of the shell. Radiating riblets numerous 

 (about 50), subequal, fine ; concentric raised strite very fine and very 

 close, minutely crenulating the riblets. Fissure narrow, about one- 

 fourth as long as the shell. Color yellowish-white. 



Length 6i, breadth 5, alt. 3i mill. 



Mediterranean Sea. 



E. solidula COSTA, Oss. Zool. Still'Isola di Pantellaria, p. 10, no. 

 18. PHILIPPI, Enum. i, p. 115, t. 7, f. 14. 



Smaller, with much finer concentric sculpture than E. fissura ; 

 far smaller than cancellata, more erect, with more numerous, equal 

 riblets. The apex is much less recurved and the sculpture finer 

 than in .E. elongata. Originally described as a fossil. Recent spec- 

 imens from the coast of Sicily are before me. 



E. CRASSA J. Sowerby. PI. 27, figs. 59, 62, 63, 64, 65. 



Shell usually more depressed than that of either of the two for- 

 mer species, moderately solid, opaque, slightly glossy ; sculpture, 

 40-50 broad and compressed longitudinal ribs (each of which is 

 sometimes divided into three) with as many smaller intermediate 

 ones ; all these ribs are crossed by fine, equally numerous and wavy 

 concentric stride or wrinkles, producing a delicately granulated ap- 

 pearance; the surface is likewise covered with minute white glisten- 

 ing dots arranged in longitudinal rows ; color white ; beak small 

 and somewhat angular, usually less excentric than in the other spe- 

 cies ; it is twisted a little to the left, and forms a spire of between 

 one and two whorls. Slit rather narrower above than below, ex- 

 tending (in adult specimens) from the middle of the front margin 

 between one-fourth and one-fifth of the way up, being closed in the 

 line of its previous passage, and becoming a rather broad and shal- 

 low groove which is closely laminated transversely ; mouth varying 

 in shape from oval to roundish-oval, delicately scalloped and 



