142 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



threads, with wider interspaces which lirate the spiral ribs, but be- 

 come feeble or absent on the base ; aperture rounded, with a much 

 thickened and reflected creamy white outer lip, more or less modi- 

 fied by the external sculpture ; pillar and body with a coating' of white 

 enamel, the pillar twisted, the canal short, sharply recurved, making 

 a strong fasciole ; throat white. Lon. of shell, 62 ; last whorl, 30 ; 

 maximum diameter, 30 nun. 



Station 4826, in 114 fathoms, Sea of Japan, July 21, 1906. U. S. 

 Nat. Mus., 110,513. 



This shell has the same number of whorls with half the length of 

 Jcucostoma, but a much heavier and differently formed outer lip. 



BUCCINUM OPISOPLECTUM Dall, n. sp. 



Shell small, elevated, slender, subacute, solid, flesh-colored, more 

 or less variegated with brown and white, with one and a half smooth 

 polished, nuclear and six sculptured subsequent whorls ; suture dis- 

 tinct, not deep, the edge of the whorl in front of it gathered into 

 rather irregular, small, short plications ; spiral sculpture including 

 two primary ridges near the periphery, with two more on the base, 

 the minor sculpture as in B. zclotcs, the stronger ridges articulated 

 with brown and white ; aperture semilunate, the outer lip callous, 

 white, heavy, reflected ; body and pillar with a thin white callus ; 

 pillar twisted, thickened at the edge ; canal wide, recurved with a 

 strong fasciole. Lon. of shell, 40; of last whorl, 27; of aperture, 20; 

 maximum diameter, 21 mm. 



Station 4996, in 86 fathoms, Sea of Japan. U. S. Nat. Mus., 

 110,514. 



Belonging to the group of leucostoma, but much smaller and more 

 conical. 



BUCCINUM NIPONENSE Dall, n. sp. 



Shell thin, elevated, flesh-color, more or less variegated or artic- 

 ulated with purple-brown and white, with an olive-brown, con- 

 spicuous periostracum and six moderately rounded whorls ; suture 

 distinct, not appressed, the whorl sloping flatly away from it to the 

 shoulder ; spiral sculpture on the upper whorls of three or four 

 primary low, rounded ridges, the hindmost forming the shoulder of 

 the whorl ; on the last whorl nine or ten more, diminishing toward 

 the canal ; between these are smaller secondary threads separated by 

 fine, sharp, narrow grooves which also striate the primary ridges and 

 are crossed by fine sharp, sometimes elevated, incremental lines ; 

 aperture slightly patulous, outer lip concavely flexuous behind, some- 

 what thickened, hardly reflected, white ; throat flesh-color or purplish 



