124 MITRA. 



M. INSOLATA, SoTCb. PL 36, fig. 82. 



More pj^ramiclal, and the whorls not gibbous at the suture as 

 in 31. lactea(= hiteficehsj var.). White. Length, 1*1 inches. 



Habitat unknown. 



An unsatisfactory species. 



:M. petrosa, Sowb. PI. 37, fig. 99. 



Thick, white, with slight revolving striae. Length, 1*5 inches. 



Habitat unknown. 

 Described from a single specimen in the late Ta^dor Collection. 



M. KiENERi, Sowb. PL 36, fig. 86. 



Plum-color, mottled or streaked with dark chestnut, with a 

 narrow white band above the periphery, and visible on the spire. 



Length, 1'25 inches. 



Sowerb}' describes and figures this from a shell which he says 

 agrees with Kiener's illustration of M. ebenua, and from which 

 species it is perfect!}' distinct. It appears to me to hold about 

 the same relation to 31. ebenus thsit Schroeteri does to cornicala, 

 and to be as closely related also to Schroeteri; in fact, it seems 

 to be a connecting form between cornicida and ebenus. 



M. Grcenlandica, Gray. PL 36, fig. 83. 



Whitish, under a corneous epidermis. Length, •5-85 inch. 



Greoiland. 



This is the type of the genus Volulomitra, Gray, separated 

 from 3fih'a on account of possessing an entirely different lingual 

 dentition. If it be recognized as a distinct genus on this account, 

 it must stand alone, as the twenty species referred to the genus 

 by H. and A. Adams are indistinguishable from 3Iitra by the 

 shell, and their dentition is entirelj^ unknown. 



M. EBENUS, Lam. PL 36, figs. 84, 85, 87, 88 ; PL 37, figs. 89, 90. 



Smooth, shining, chocolate-brown ; with a narrow 3-ellowisli 

 line upon the upper part of the body-whorl, visible on the spire. 



Length, '75-1 inch. 



Mediterranean f^ea ; North Atlantic Coast of Africa. 

 Var. cosTATA has the shell wrinkled longitudinally^, a well-marked 

 example being 31. Defj^ancii, Payr. (fig. 88) ; all intermediate 

 stages occur to the smooth form. 



