above the suture ; upper part of the last volution surrounded by a very broad callous belt, which extends over two-thirds of the 

 volution, and, which is very remarkable, increases in width with the age of the shell ; below that is a rather deeply impressed 

 line, which terminates in a mucronate projecting tooth near the lower edge of the outer lip ; there are then two belts, the upper 

 of which has its superior edge rather prominent, and a depression in the middle ; there is a rather deep groove immediately above 

 the columellar varix, which is smooth, and has also one groove ; the superior extremity of the aperture is rather obtuse, the inferior 

 notched ; outer lip smooth-edged, with one tooth near the lower part. 



Besides the specimen in the Tankerville collection, I have seen only seven others of this very rare shell, with whose locality 

 I am unacquainted ; two of these are in the Geological Society's collection, and four in my own ; they vary a little in their 

 proportions as well as in their colours. This species approaches in general form and stature to the Ancillaria glabrata, it is 

 however easily distinguished, by its not having an umbilicus. 



* A few specimens have lately been dredged up near the Island Martraretta, on the coast of Columbia. 



ANCILLARIA BALTEATA. Fig. 56, 57. 



Swainson in Journ. of Science, Lit. and Arts, XVIII., 284. 

 A. testa omtd, subcylindraced, spird conoided ; anfractu ultimo supra late balteato, balleo superne incrassato ; infra lined 

 impressd nctabili, balteis diwbus et sulco prof undo supra varicem instructo ; sulco in umbilicum superne decurrente; 

 varice columellar i sulco sinistrali obsolete striato ; labio externo prope basim unidentato ; aperturd superne coarctatd, 

 infra emarg'natd ; labio columellari mediant: concavo ; long. \ T \, lat. ~[\, poll. 

 Syn. Eburna balteata, Sowerby, Genera of Shells, No. 19, f. 3 and 4. 

 Hab. in Sinu Arabico ? Mus. Swains, nost. 



Desc. Shell ovate, subcylindrical, with a conoidal spire, of a pale yellow or orange colour ; last whorl with a broad belt 

 at the upper part, the superior edge of which is thickened and angular ; lower part of the last whorl with a strongly-marked 

 impressed line, two belts and a deep groove above the columellar varix, which groove runs into the umbilicus above ; columellar 

 varix with a groove on the left side, and obsoletely striated ; outer lip with a single tooth on the edge near the base ; aperture equal 

 to half the length of the shell, contracted at its superior extremity, notched at the base ; line formed by the columellar lip concave 

 in the middle. The umbilicus in this species is not nearly so deep as in A. nivea of Swainson, or as in A. glabrata. 



ANCILLARIA NIVEA. Fig. 58, 59. 



Sivainson in Journ. of Sc. Lit. and Arts, XVIII., 285. 

 A. testa oblongd, spird rotundato-acuminatd, nivea, anfractu ultimo, supra, late 'balteato, balteo superne incrassato ; infra 

 lined impressd notnbili, balteis duobus et sulco supra varicem, profundo instructo ; sulco supra varicem et sulco varicis 

 sinistrali in umbilicum superne juxta decurrentibus ; varice columellari obsolete striato ; labio externo prope basim 

 unidentato; aperturd superne coarctatd, infra emarginatd ; labio columellari mediane concavo ; long. Iaa, lot. T %, 

 poll. 

 Hab. in Oceano Indico. Mus. Swainson, Goodall. 

 Var. l ma . testa, pallide aurantiaca. Mus. nost. 



Desc. Shell oblong, spire rotundato-acuminate ; white, or pale yellowish, or light fulvous, with the upper part of the 

 whorls of the spire orange ; last whorl with a very broad belt, thickened at its upper edge ; lower part of the last whorl with a 

 deeply impressed line, two belts and a deep groove above the varix ; this groove, and another on the left side of the columellar 

 varix, unite at the upper end, and run together into the umbilicus ; columellar varix obsoletely striated ; outer lip with a single 

 tooth near the base ; aperture half the length of the shell, contracted at the upper part, notched at the lower, the line formed by 

 the columellar lip concave in the middle. 



I have rather hesitated to adopt this species, because it so nearly resembles A. balteata; the umbilicus is, however, much 

 larger and deeper, and there are other characters by which it may be distinguished ; I have thought it better, therefore, to con- 

 tinue it as a distinct species, than to unite it with another from which it differs. 



