30 AMERICAN MARINE CONCHOLOGY. 
carinated, plicated; longitudinal folds thirteen to eighteen. in 
number, more or less oblique, variable in number and prominence, 
but never entirely obsolete at the suture. Primary spiral ridges 
narrow and distant, about thirty in number on the lower whorl, 
but somewhat variable in strength and distance; sometimes 
double or divided in two by a groove. Secondary ridges alter- 
nate with the primaries singly or by groups of two, three, or four; 
they are distinguished from the primaries by being less prominent, 
and occupying the depressions constituting the primary grooves. ° 
In some specimens the primary and secondary ridges and grooves 
can scarcely be distinguished from each other. Aperture elliptical, 
elongated and narrow, a little more than half the length of the 
shell, not patulous, but somewhat canaliculated and projecting 
below; outer lip scarcely at all sinuated. Columella with a dis- 
tinct tooth or projection near its anterior or lower extremity. 
This projection corresponds to the second fold of the columella 
seen in several species, such as B. tenue and B. undatum, but it 
is more tooth-like than in any other species of the genus, and 
constitutes an important and easily recognized specific character. 
Periostraca ciliated. 
Length 38, diam. 20 mill. 
This is not the eiliatum of Gould’s “Invertebrata of Massa- 
chusetts.” That species is Bb. Humphreysianum, Bennett. 
Nova Scotia, Newfoundland Banks, northwards. 
3. B. UNDULATUM, Moller. Fig. 45. 
Kroyer’s Tidsskrift, iv. 84. 1842. 
Stimpson, Review of Buccinum. 1865. 
Buccinum undatum, Gould (not Linn.), Invert. Mass. 305. 1841. 
Tritonium undulatum, Morch, Rink’s Greenland. 84. 1857. 
Buccinum Labradorense, Reeve, Conch. Icon., f. 5. 1846. 
Shell thick, ovate-conic, ventricose, grayish or brownish-white, 
encircled by prominent primary raised lines and minute inter- 
vening secondary strive; with twelve or thirteen longitudinal, 
obliquely waved, elevated ribs or plaits on the spire and upper 
portion of the body-whorl; epidermis velvety, yellowish-brown ; 
. whorls six, regularly convex; aperture oval, about one-half the 
length of the shell, golden yellow within; minute striae extend 
some distance within the mouth and produce faint crenulations of 
the outer lip; this is somewhat everted and arched so as often to 
produce a conspicuous notch at about its posterior third; colu- 
