GASTEROPODA. 273 
wile 
SHELL of moderate size, lanceolate-fusiform, slender, solid, shining, 
dull-white, marbled with ferruginous and fawn-coloured blotches, ar- 
ranged somewhat longitudinally ; surface finely decussated with deli- 
cate, well-relieved longitudinal ribs, the presenting edges flat, about 
thirty on each whorl, and with impressed, revolving lines (about eight 
on penultimate whorl), which only appear in the interstices of the ribs, 
until from the middle of the last whorl they begin to enlarge, and 
finally become predominant about the base. Whorls nine or ten, flat, 
angular at the upper fourth, and shelving to the suture, this portion 
destitute of strie; last whorl more than one-half the length of the 
shell, cylindrical at the middle, and tapering gently to the base. 
Aperture narrow, lips nearly parallel, more than one-half the length 
of the shell; lip slightly arched, sharp, faintly roseate; interior flesh- 
coloured, and with about thirteen delicate, elongated, raised threads ; 
pillar a little arched posteriorly ; four-plaited ; siphonal notch a little 
reflexed obliquely. 
Length four-fifths of an inch ; breadth three-tenths of an inch. 
Habitat unknown. Obtained by Mr. Walker. 
The form and sculpture are much like that of M. hebes, Reeve, but 
the colouring is more like M. crenifera. It is more cylindrical, and 
the bars are less prominent than M. cophina, besides being different 
in coloration. 
Figures 354, 354 a, dorsal and ventral views of the shell. 
Mirra CaPILLATa (Gould). 
T. parvula, elongata, ovato-fusiformis, polita, rufo-castanea lineolis 
longitudinalibus flexuosis crocets ornata: spira acuto-conica, anfrac- 
tibus septem convexiusculis, ultimo bifariam attenuato, anticée strits 
prominults cincto ; sutura impressa: apertura dimidiam longitudinis 
teste, angusta, elliptica; columella tri-plicata, posticé callosa ; Sauce 
lurida. 
Mitra capillata, Goutp ; Proceed. Boston Soc. Nat. Hist., iii. 171. 
January 1850. Expedition Shells, 73. 
69 
