DESCRIPTION. 149 



rays and streaks ; the inner whorls dark brown ; 

 interior surface fine mother-of pearl ; umbilicus 

 pervious. 



Inhabits the Indian and African Ocean. 



Fig. 3. N. Spirula. 



Shell with an orbicular aperture, whorls cylin- 

 dricalj remote. 



Lister Conch, tab. 550. fig. 2. 



Specimen white, within pearly; whorls gradu- 

 ally decreasing towards the point of the spire ; the 

 last whorl excentric, continued, in a perfect shell, 

 into a long cylindrical straight tube ; siphunculus 

 lateral. 



Inhabits the American and Indian Ocean. 



PLATE XIII. 



Fig. 1. CoNUs Virgo. 

 Shell conical, with a blueish base. 

 Lister Conch, tab. 754. fig. 2. 

 Specimen pale yellow, base purplish blue, 

 smooth. 



Inhabits the African Ocean. 



