of the Genus AnciUana: 275 



racter, arranging the species according to its progressive deve- 

 lopement, and by this method the transition from one division to 

 the other will be more natural. 



Section I. Ancillaria. Atictorum. 



* Spire short. 

 1. Ancillaria Candida. Lam. 

 A. testa ohlonga, svib-cylindricd, albd, effusd ; basi bicindd ; labii mar- 



gine Icevi. 

 Shell oblong, semicylindrical, white, effuse j base two-belted j margin of 



the lip smooth. 

 A. iestd elongatd, semi-cylindricd, candidd, suturis anfractuum obsoletiss 



varice columellari substriato. Lam. An. sans Vert. 7, p. 414. 

 Martini. 2 tab. 65. f. 722. Ency. Meth. pi. 393, f. 6. 

 Valuta ampla. Gmelin Sys. Nat. 3467. 

 BxUlaampla. Dill wyn l.[ 490. 

 Ancillaria Candida. Lamarck. Monograph in Ann. duMus. vol. xvi, p. 304. 



Id. Hist, des Anim. sans Vert. 1. c . 



Shell from an inch to an inch and a quarter long ; lengthened, 

 slender, and semi-cylindrical ; the aperture is very effuse, and the 

 spire slender and much shorter than in any of the following species : 

 on the lower half of the basal whorl are two oblique indented lines, 

 parallel and near to each other, which divide the shell (when viewed 

 beneath) into two equal parts ; the upper line is more strongly im- 

 pressed than the lower, and is margined within by another very fine 

 line, which in old specimens is generally hid by enamel ; the belt 

 (by being thus divided) may be said to be double, and is scarcely 

 elevated. The whole shell is either pure white, or slightly tinged 

 with yellowish, and sometimes tipt with bright rufous. The figures 

 to which I have referred are very indifferent. Inhabits the Indian 

 Ocean. 



2. Ancillaria effusa. Sp. Nov. Mihi. 

 A. tesld ohlonr/d, semi-ct/lindricd, fulvo alboque fanciatd, sulco supra va- 



rieem profunda; labia exteriore recta, unidenlato ; apcrlurd fused , 



effuxd. 

 Shell oblong, sub-cylindrical, fulvous, with white bands ; above the varix 



of the pillar a deep groove ; outer lip straight, one-toothed ; aperture 



brown, efluse. 



