230 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



cies most nearly allied. The latter has a smaller and shorter nucleus 

 and white shell substance. It is also a lighter and thinner shell. 

 It is possible, judging from some of the other species, that the spiral 

 ridges which are obsolete in the type-specimen, may in other individ- 

 uals be stronger and more elevated. The operculum is unknown. 



ANCISTROLEPIS DAMON Dall. 



Chrysodomus (Ancistrolepis) damon Dall, Smithsonian Misc. Coll., No. 

 1727, p. 157, 1907. 



The original specimen of this species from which it was described 

 had a single low keel at the shoulder and half a dozen nearly obsolete 

 ridges on the base. Specimens from Nemuro, Yesso, sent by Mr. 

 Hirase have five prominent cords on the base with wider interspaces, 

 and the spiral striation quite perceptible over the whole surface. 

 There is also a cord in front of the suture, between it and the shoul- 

 der keel. Another specimen from the same locality has in addition 

 two strong equidistant cords on the periphery in front of the keel. 

 For these quite distinct looking forms. I propose the varietal name of 

 polygramma. 



SIPHONALIA LUBRICA, new species. 



Shell slender, acute, with about seven whorls and a nucleus of some- 

 what less than two additional whorls ; with brown flammulations and 

 more or less interrupted spiral rows of brown dots on a yellowish- 

 white ground ; nucleus smooth, polished, flat-topped with the whorls 

 inflated; subsequent whorls sculptured with (on the penultimate 

 whorl 12) short rounded axial riblets at the shoulder of the whorl 

 but more or less obsolete above and below, and varying in extent on 

 the spire in different specimens; these are separated by narrower 

 interspaces and may be obsolete on the last whorl and a half ; spiral 

 sculpture of close-set inconspicuous threads more or less flattened 

 on the last whorl and rarely with occasional smaller intercalary 

 threads; suture rather constricted and strongly appressed; aperture 

 rounded, the outer lip thin and sharp; when mature (and not worn 

 by hermit crabs) with eight or ten lirations a little within the margin 

 of the outer lip; a small, prominent subsutural callus on the body 

 and another at the margin of the canal on the concavely arcuate 

 pillar-lip; throat and pillar white, the latter slightly erased; canal 

 narrow, long, strongly recurved, the fascicle not prominent. Length 

 of shell 59; of last whorl 40; of aperture 18; of the canal 17; max- 

 imum diameter of last whorl 22 mm. 



Habitat. — Tosa and Nagasaki, Japan. Hirase collection. 



This species is rather exceptional in its slender form and polished 

 surface. The operculum was not preserved. The prominent callus 

 on the edge of the pillar at the inception of the canal gives it some- 

 what the aspect of a Fasciolaria. 



