dali.] NEW SPECIES OF SHELLS 169 



luster shining through a very thin yellowish periostracum, the upper 

 surface painted with a pale brown zigzag nebulous coloration ; 

 nucleus globular of a single whorl, pale, followed by five subsequent 

 whorls moderately convex, with obsolete incremental and spiral 

 markings ; periphery rounded, base uniformly pale, the convexity 

 equal to that of the upper surface of the whorl, with a large, com- 

 pletely pervious, vertical-sided umbilicus, with a rectangular margin ; 

 the keel of the umbilicus is crenate by short radial grooves, which 

 also extend up the sides of the funnel and are sharply reticulated 

 there by four or five sharp spiral grooves ; aperture ample, the upper 

 part of the outer lip produced, making the plane of the aperture 

 oblique ; remainder of the margin rounded except at the umbilical 

 keel and where the body interrupts the thin sharp peristome ; in- 

 terior pearly ; operculum thin, concave, yellowish, with about eight 

 whorls. Alt. of shell, 6; maximum diameter, 10; minimum diameter, 

 8 mm. 



Sea of Japan, at station 4891, 1906. U. S. Nat. Mus., 110,543. 



Genus COCCULINA Dall 

 COCCULINA JAPONICA Dall, n. sp. 



Shell small, white, elevated, finely, sharply, radiately striated, the 

 apex recurved ; anterior slope convexly arcuate, longer ; posterior 

 slope direct, sloping, shorter ; periostracum very thin, pale yellowish ; 

 interior smooth, white ; margin thin, nearly equally rounded at both 

 ends. Lon. of shell, 8.2; lat, 6; alt., 3.5; the apex behind the an- 

 terior end, 7 mm. 



Off Sado Island, Sea of Japan, at station 4813. U. S. Nat. Mus., 

 110,544. 



This is the first record of the genus from the Sea of Japan. 



Genus DENTALIUM Linne 

 DENTALIUM CROCINUM Dall, n. sp. 



Shell solid, reddish yellow, smooth, polished, without sculpture 

 except incremental lines ; diameter rather rapidly increasing ; anal 

 aperture entire, circular ; also the anterior aperture ; shaft arcuate. 

 Lon. of shell (chord), 39; diam., post., 1; ant., 5 mm. 



Station 5094, Gulf of Tokio, Japan, in 88 fathoms. U. S. Nat. 

 Mus., 110,508. 



This is nearest D. longistrorsum Reeve, but increases more rapidly 

 in caliber and probably does not attain so great a length. 



