DRILLIA. 89 



tuberculiferus, Brod. variegatus, Kien. 



ustulatus, Reeve. 



Sub-gen. genota, H. and A. Adams (Genot, Adanson). 



Shell mitriform, whorls finely cancellated ; aperture longer 

 than wide ; canal not produced ; outer lip with a deep posterior 

 sinus. 



mitriforrais, Wood. papalis, Reeve. 



Sub-gen. beach itoma, Swainson. 



Outer lip ascending and forming a short canal ; sinus small 

 and nearly semicircular ; inner lip thickened above. 



castanea, Swains. strombiformis, Sow. 



Sub-gen, CONOPLEURA, Hinds. 

 Shell coniform ; spire coronated ; sinus deep, near the suture, 

 striata, Hinds. 



Grenus DRILLIA, Gray. 



Tentacles approximated ; eyes at their outer side near 

 the tip. 



Shell turreted ; spire raised ; aperture oval ; canal short, 

 recurved ; inner lip thickened ; outer lip inflexed, with a 

 deep posterior sinus, and a small sinus at the fore part. 



Ex. D. Oagayanensis, Reeve, pi. 10, fig. 2. Operculum, 

 D. alabaster, Reeve, fig. 2, a, 2, h. Shell, D. Oagayanensis, 

 fig. 2, c. 



The principal character by which this genus may be dis- 

 tinguished from Turris, is the shortness of the canal, which 

 also is recurved. The Drilliee are very numerous and 

 widely distributed. 



VOL. I. N 



