66 ANCILLARIA. 10. 



Sect. III. The columellar callus separated from the body-whorl, 

 leaving an umbilicus behind it. 



42. glabrata, Linn. (Buccinum). — A. fusiformis, polita, au- 

 rantio-flavida ; spira acuminata ; aufractibus gradatis ; tegmine 

 calloso tenuiter prope suturam inferiorein extenso, infra suturam 

 fascia impressa alba ; balteis inferioribus duobus, planis, subae- 

 qualibusj columella callosa, superne incrassata, super anfractum 

 ultimum expansa, medio profundi et oblique urubilicata, infra ob- 

 lique costa elongata, post varicem posita; varice trigono, sub- 

 planato; apertura infra late emarginata, unidentata (f. 62, 63). — 

 In this beautiful, although now common shell, the spiral enamel 

 is spread downwards to within a line's breath of the lower suture. 

 A. white dwarf variety is not uncommon. 



43. balteata, Swains. — A. ovalis, alba seu aurantia; spira 

 obtusa, callo incrassata; anfractibus paucis, supra angulatim va- 

 ricosis; tegmine spirali infra medium extenso; balteis inferioribus 

 crassis, vix distinctis ; costa, post varicem brevi ; umbilico parvo, 

 haud profundo (f. 59-61). — A sort of rib or shoulder gives an- 

 gularity to the whorls of this species ; and the enamel does not 

 descend so near to the suture as in A. glabrata. The species is 

 distinguished by Mr. Swainson, and in the 'Species Conchy lioruin,' 

 principally by the narrowness and want of depth in the umbi- 

 licus. In the younger specimen it is wanting altogether ; and 

 my own impression is that the umbilicus increases in depth with 

 the age of the individual. 



44. nivea, Swains. — A. ovalis, alba seu aurantia ; spira ob- 

 tusa, callo incrassata ; anfractibus paucis, supra angulatim varico- 

 sis ; tegmine spirali infra medium extenso, gradatim expanso ; 

 balteis inferioribus crassis, vix distinctis; costa post varicem 

 brevi; umbilico magno, profundo (f. 64, 65). — The band left un- 

 covered by the descending enamel becomes narrower towards the 

 outer margin. The umbilicus is deep. 



