A. E. Yerr ill — Catalogue of Marine Mollusca. 
493 
oft 1 Nova Scotia, and from the Grand Bank, by the Gloucester 
fishermen. Gulf of St. Lawrence, off* Metis (coll. Dawson). 
Some of our specimens belong to the dark variety, tenebrosum 
Han.; others are near the variety Finmarchianum Verkruzen. The 
variety perdix or glabra Morch (Catal. Moll. Spitzberg, p. 14, 1869), 
is probably the same thing as the latter. 
Our specimens vary considerably in color and in sculpture. They 
mostly have light shades of brown or yellowish brown, varied with 
lighter and darker tints, and mostly with the principal revolving cin- 
guli darker brown, interrupted by pale spots, the whitish spots often 
wider than the spiral lines; interior light yellowish brown or salmon, 
the external colors often showing through; columella whitish. Epi- 
dermis thin, closely lamellose along the lines of growth, and in the 
freshest and young alcoholic specimens with rows of fine, short hairs 
aloug the revolving cinguli ; these are usually rubbed oft* from dried 
specimens. Whorls seven, well-rounded, often obscurely shoulderd ; 
suture impressed. 
Many of the specimens are entirely without undulations or ribs ; 
others have 12 to 15 short but distinct ones, most prominent close 
to the suture, mostly only slightly flexuous, fading out on the con- 
vexity of the whorl, or passing insensibly into the lines of growth, 
which are usually raised and very distinct, receding strongly at the 
shoulder, or on the convexity of the whorls. 
The spiral sculpture consists of numerous, close, unequal, wavy, 
slightly raised cinguli, separated by fine, narrow, impressed grooves ; 
usually there are, on the lower whorls, ten to twelve larger and 
slightly more raised cinguli, between which there may be three to five 
smaller and lower cinguli, varying among themselves in size and 
height, and becoming still more numerous on the last whorl ; the larg- 
est of these cinguli are not very prominent, and are more or less angu- 
lar, and the grooves between are shallow and not sharply cut. These 
grooves .are finely decussated by the thin, close, raised lines of 
growth, which also cross the cinguli, giving them a minutely wavy 
appearance. 
The nucleus is a little prominent, with its suture impressed ; the 
apical whorl is small, regularly spiral, smooth, glossy yellowish or 
chestnut-brown; about eight fine, spiral cinguli, with their intersti. 
ces decussated by the lines of growth, begin on the second whorl ; on 
the third whorl there are about twelve of these, and they begin to be 
alternately larger and smaller. 
Aperture short, irregular, rather small; outer lip with a well- 
