118 MITRELLA. 



The dark-surfaced species included in the above description is 

 C. denticulata, Duclos (fig. 49) ; the form of the shell and pattern 

 of coloration leave not a doubt of its identity with C. moleculina. 

 I feel almost assured of the identity of these shells with (J. ida- 

 lina, although I find none among the numerous specimens of that 

 shell before me, showing their coloration. 



C. REEVEI, Carpenter. PL 47, fig. 50. 



Shell with fine revolving linear grooves ; white more or less 

 clouded or spotted with chestnut-brown, often forming a revolving 

 row of spots below the suture, or brown with white spots below 

 the suture ; interior of outer lip very faintly plicate. 



Length, 8 mill. 



Guacomayo to Cape St. Lucas, Gal. 



First described by Carpenter as C. Santa- Bar bar ensis, and 

 subsequently changed as above, because the species is of more 

 tropical distribution, and is believed not to approach Santa- 

 Barbara, Cal. 



C. IONIDA, Duclos. PI. 47, fig. 51. 



Shell uniform pale rose or orange, the spire and upper portion 

 of the body with rounded longitudinal ribs, the lower portion of 

 the body-whorl with revolving lines ; outer lip dentate within. 



Length, 13 mill. 



Habitat unknown. 



Although comparatively large the original figures of this 

 species appear to indicate juvenilit3 T . The form of the shell 

 scarcely permits its arrangement in this group, recalling that of 

 the typical Columbellas, but the dentition of the outer lip is 

 different, and in the sculpture there is some analogy with C. 

 idalina. 



C. IRRORATA, Reeve. PL 47, fig. 52. 



Shell acuminately oblong, smooth , spire acicular, whorls convex, 

 the last groove-striated at the base ; yellowish, finely dotted 

 with orange throughout, and encircled beneath the sutures with 

 orange-shaded, snow-white spots; aperture ovate, lip denticulated 

 within. Length, 15 mill. 



Australia (Mus. Cuming), Tasmania (Woods). 



C. ACICULA, Reeve. PL 47, figs. 53, 54. 



Shell subulate, slender, solid, variegated throughout with minute 



