CLASS GASTROPODA 
109 
intervals. Of these there are usually about three to five on the penultimate 
whorl, and about twenty to twenty-eight on the last, the greatest number 
being below the middle, on the siphon, where they become coarser and 
closer, with narrower rounded intervals. One of the sulci just below the 
shoulder is usually more distinct, and cuts the tips so as to give their upper 
ends a subnodulous appearance; below this there is usually a rather wide 
zone, without grooves, usually no revolving lines above the shoulder. The 
apex is usually eroded; when perfect it is smooth. The nucleus has a 
very small and slightly prominent smooth apex; its first turn is marked 
with fine spiral lines; the next whorl has, at first, about three stronger 
spiral raised cinguli, which soon begin to be crossed by thin transverse 
riblets. Aperture about half the length of the shell, narrow ovate, or 
elliptical, angulated above. Canal short, nearly straight, a little narrowed 
at the base by an incurvature of the lip. The outer lip has a decided angle 
at the shoulder, below which the edge is well-rounded, and projects 
strongly forward, in the middle; the sinus, above the shoulder, is rather 
deep, wide, and evenly rounded within. Columella strongly excavated in 
the middle, obliquely receding at the end. The shell is commonly greenish- 
white and covered by a thin, close, greenish epidermis; but some specimens 
are clear white, and rarely pinkish. Long., 6.5; breadth, 3.5; aperture, 
3 mm. (Verrill.) 
Type in ? Type locality, Labrador. 
Range. St. Lawrence Bay, Bering Strait. (Krause.) Also Atlantic. 
This is one of the most common and widest distributed species of the 
Bela found on the New England coast. (Verrill.) 
Described as Bela incisula. 
Lora nobilis Moller, 1842 
Plate 7, fig. 9 
Index Molluscorum Gronlandiac, 12. G. O. Sars, Mollusca regionis arcticae Norvegiae; 
PI. 16, figs. 19, 20, 1878. 
Testa ovato-fusiformi, alba; anfr. 6 juxta suturam angulatis, longitudi- 
naliter lines impressis cinctis, transversim costulatis; spira elata, breviore 
quam venter. L. 7.5'". (Moller.) 
Shell ovate-fusiform, white, whorls six in number angulated at the 
suture, longitudinally girdled with impressed lines transversely costulate; 
spire elevated, shorter than the venter. (Translation.) 
Type in Zoology Museum, Christiania. Type locality not known to 
writer. 
Range. Arctic Ocean, Bering Sea, ofiF Akutan Pass, in 60 fathoms. 
Circumboreal. 
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