ZIDONIN^E. 



161 



Species of Aulica. 



aulica, Soland. 

 corona, Chem. 

 innexa, Reeve. 

 luteostoma, MeuscJi . 

 mamilla, Meusch. 

 marmorata, Swaijis. 

 Moltkiana, Mart. 

 nivosa, Lam. 



Norrisii, Soiv. 

 piperita, Soiv. 

 pulchra, Swains. 

 punctata. Swains. 

 rutila, Brod. 

 scapha, Gtnel. 

 Speugleriana, Mart. 

 vespertilio, Linn. 



Sub-fam. ZIDONIN.^. 



Eyes sessile, without tubercles. Mantle produced on 

 the left side into an expanded lobe enveloping all the 

 shell as far as the apex of the spire. Shell with the 

 volutions of the spire covered with a vitreous deposit. 



Genus ZIDONA, H. and A. Adams. 



Shell smooth, subcylindrical, whorls angulated; spire 

 pointed, polished, and covered with a calcareous deposit 

 concealing the suture ; aperture wide ; columella obliquely 

 plicate in the middle, plaits few; outer lip acute, not 

 reflexed. 



Syn. Volutella, D'Orb.^ not Perry or Swains. 



Ex. Z. angulata, Solander, pi. 17, fig. 5. Shell, Z. 

 angulata, fig. 5, a. 



The great peculiarity of Zidona is the circumstance of 

 the mantle covering the sides of the shell, giving the 

 long pointed spire a peculiar vitreous or glazed appear- 



VOL. r. Y 



