COLUMBELLIDAE 22 3 



gausapata Gould (California to Alaska) is similar, but without the swollen 

 shoulder. 



Genus Mitrella Risso 1826 

 Subgenus Astyris H. and A. Adams 1853 



Mitrella lunata Say Lunar Dove-shell 



Plate 25gg 



Massachusetts to Florida, Texas and the West Indies. 



%6 to M inch in length, glossy, smooth, translucent-gray and marked 

 with fine, axial zigzag brown to yellow stripes. Base of shell with fine, in- 

 cised spiral lines. Aperture constricted, slightly sinuate. Outer lip with 4 

 small teeth on the inside. No prominent varix. Nuclear whorls very small 

 and translucent. Color sometimes milky-white or mottled in brown. A very 

 common species found at low tide. 



Mitrella raveneli Dall Ravenel's Dove-shell 



Plate 25CC 



North Carolina to both sides of Florida. 



% inch in length, resembling lunata, but translucent-whitish, without 

 the mottlings, normally a slightly larger shell, more elongate, with a longer 

 siphonal canal, and with a rather thin outer lip which lacks the deep sinua- 

 tion found in the upper portion of the outer lip as in Iwiata. Commonly 

 dredged from 5 to 90 (rarely to 200) fathoms. Rarely washed ashore. 



Mitrella tuberosa Carpenter Variegated Dove-shell 



Alaska to the Gulf of California. 



/4 inch in length, slender, with a narrow, pointed, flat-sided spire. Shell 

 smooth and usually glossy. Outer lip slightly thickened and with small teeth 

 within. Color a translucent yellowish tan with opaque, light-brown flammules 

 and maculations. Sometimes all brown with tiny white dots. Early whorls 

 in worn specimens have a lilac tinge. Periostracum thin and translucent. 

 Common in shallow water; 7 to 30 fathoms. M. variegata Stearns may be this 

 species. 



Genus Amphissa H. and A. Adams 1853 

 This genus was formerly placed in the family Buccinidae. 



Amphissa versicolor Dall Joseph's Coat Amphissa 



Figure 50a 



Oregon to Lower California. 



