124 MITRA. 



M. INSOLATA, Sowb. PI. 36, fig. 82. 



More pyramidal, and the whorls not gibbous at the suture as 

 in M. lactea (= lutescens, var.), White. Length, 1-1 inches. 



Habitat unknown. 



An unsatisfactory species. 



M. PETROSA, Sowb. PL 37, fig. 99. 



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



JJabitat unknown. 

 Described from a single specimen in the late Taylor 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. 



Sowerby describes and figures this from a shell which he says 

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

 species it is perfectly distinct. It appears to me to hold about 

 the same relation to M. ebenusth&t Schrosteri does to cornicula, 

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

 to be a connecting form between cornicula and ebentts. 



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



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



Greenland. 



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

 from Mitra 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 Mitra by the 

 shell, and their dentition is entirely unknown. 



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



Smooth, shining, chocolate-brown; with a narrow yellowish 

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



Length, '75-1 inch. 



Mediterranean Jftea ; North Atlantic Coast of Africa. 

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

 example being M t De.francii, Payr. (fig. 88) ; all intermediate 

 stages occur to the smooth form. 



