CLASS GASTROPODA 
205 
Sulcosinus taphrius Dali, 1891 
Proceedings of the United States National Museum , 14:186; 17 :707; PI. 29, fig. 6, 1895. 
Shell thin, slender, with polished brown epidermis, with fine spiral 
striae and conspicuous zigzag or spiral malleations; six-whorled, acute; 
suture deeply channeled; aperture white, with thick reflected lip and con¬ 
tinuous thick callus on the concave pillar. Length of shell, 40; breadth, 
18; length of aperture, 15 mm. (Dali.) 
Type in United States National Museum. Type locality, U.S.S. “Alba¬ 
tross” Station 3330, off Akutan Island, Bering Sea. 
Rang?:. Bering Sea, off Unalaska, in 351 fathoms. 
Genus EXILIA Conrad, 1860 
Shell elongate, very slender, with numerous whorls, chrysodomoid 
nucleus, and a straight canal; periostracum conspicuous, polished sculpture 
of numerous, fine, flexuous, axial ribs and spiral striation; aperture small, 
simple, not lirate within, outer lip thin, sharp, not reflected; inner lip and 
pillar smooth, without plications or denticles of any sort; operculum long, 
slightly arcuate, with apical nucleus. (Dali.) 
Type. Exilia per gracilis Conrad. 
Distribution, Atlantic and Pacific, North America. Fossil: Eocene, 
Alabama; Pliocene, California. 
Exilia kelseyi Dali, 1908 
Plate 13, fig. 6 
Proceedings of the United States National Museum, 34:249. 
Shell elongate, slender, acute, the spire much longer than the aperture; 
white, covered by an ovilaceous periostracum; having ten whorls exclusive 
of the (eroded) nucleus of about two whorls; suture appressed and the 
whorls slightly constricted in front of it; axial sculpture of (on the 
seventh whorl about 12) concavely arcuate, slightly protractive, low nar¬ 
row ribs, crossing the whorls, on the later whorls becoming obsolete and 
finally absent from the last whorl altogether; the interspaces are wider 
than the ribs; these are crossed by fine sharp spiral striae, somewhat ir¬ 
regularly spaced, of which there are about a dozen on the seventh whorl, 
a narrow space before the suture being less sharply or not at all striate; 
aperture narrow, outer lip arcuate, somewhat excavated near the suture 
and produced anteriorly, slightly thickened, simple, and internally smooth; 
inner lip smooth, with sculpture erased, passing gradually into the long 
straight pillar, which is attenuated in front; canal long, narrow, straight. 
[ 205 1 
