APPENDIX. 357 



I have named this interesting species in honour of the 

 Marquess of Northampton, P.R.S. whose unceasing exer- 

 tions in the cause of science, and especially of Natural 

 History, are well known to all. 



Ancillaria tricolor. 

 Marine shells, Plate \.f. 4. 



Shell ovate, rather elongate, imperforate, purplish brown, 

 spirally and concentrically but indistinctly striated, thin, 

 smooth, very minute. 



Spire conical, rather shorter than the length of the last 

 whorl, blunt at the tip. Whorls slightly rounded, pale 

 in front, last with a broad bright orange brown band in front. 



The anterior enamel band, single, narrow, dark orange 

 brown, about half as broad as the brown band, the front half 

 pure white, the hinder or sutural enamel band, narrower 

 than the front one, pure opaque white. 



Pillar much curved without any plaits. Mouth ovate, 

 twice as long as wide; outer lip (toothless ?) throat brown. 



Inhab. — Cape York on sand. Cabinet of Mr. Cuming. 



Ancillaria elongata. 

 Marine shells, Plate \. f. 5. 



Shell ovate, elongate, imperforate, white, thin, smooth. 



Spire, conical, one-third the length of the shell, rather 

 blunt at the top ; upper whorls spirally ridged, last whorl 

 spirally striated, and slightly concentrically wrinkled. 



Anterior enamel belt, single, polish white ; the posterior 

 enamel belt, similar but rather wider; pillar rather curved, 

 without any plaits ; mouth elongate, ovate ; throat white, 

 outer lip toothless. Axis. Diam. 



Inhab. — Dupeeck's Island. Cabinet of Mr. Cuming. 



