of the Genus Ancillaria. 285 



body whorl is crossed by a very thick convex belt of whitish 

 enamel, which likewise spreads over the spire. The umbi- 

 licus is placed in the same part of the shell as in A. glabrata, but 

 is only partially developed, being represented by a deep sulcation, 

 instead of the hollow space (between the inner lip and the body 

 whorl) seen in the two following species. The basal belts are four; 

 two are convex, of which the upper one is narrow; then follow 

 two grooved lines ; and above all these, and nearly in the middle of 

 the body whorl is another broad belt of thin enamel; this additional 

 belt is also in the next species, but is not seen in A. glabrata. Op. 

 the whole, it appears that the specific character of balteata must 

 rest on the thick convex margin of the body whorl, and the imperfect 

 form of the umbilicus. 



Mr. Sowerby has given an excellent figure of this species, and 

 associates it very properly with the Eburna glabrata of Lamarck. 

 I am told by Mr. Mawe that it has been brought from theRed Sea. 



14. Ancillaria nivea. Sp. Nov. Mihi. 



A. teslS, umbilicata, ovato-oblongd, alba ; anfractibus superne crassioribus ; 



basi Irkincta, balteis lineis 2, impressis, divisis. 

 Shell umbilicated, ovate-oblong, white,- whorls above thickened j base 



with three belts, divided by two impressed lines. 

 Shell one inch and three-quarters long, larger and more oblong 

 than the last, and of a pure white, highly polished ; the upper 

 part of all the volutions is slightly thickened, and it has the same 

 number of belts as balteata, but with this difference, that, in Nivea, 

 the two lowermost are of equal breadth, and deeply divided ; but 

 in balteata the upper one is very narrow, and the division slight ; 

 the umbilicus moreover is as large as in the next species. 



15. Ancillaria glabrata. Mihi. 

 A testd iimbilicatd, ovato-oblongO,fnlvS, anfractibus laevibus; bmibiciiictS, 



balteis sulco svperni marginatis. 

 Shell umbilicated, ovate oblong, fulvous yellow, whorls smooth, base 



with two belts, margined above by a sulcated groove. 

 Buccinum glabratuin. Linn. Gm. 3489. Brug. Diet. 264. 28. 

 Eburna glabrata. Lam. Anim. sans Vert. 7. p. 281. Sow. Gen.Fasc, 19. 



Eburna f. I. 



