101 



1461 Turris (Surcula) halcyonis Dall. 



Shell small, slender, very acute, of a livid purple covered with 

 an olivaceous periostracum, with about 11 whorls; nucleus more 

 or less eroded, but apparently smooth, acute, and including about 

 2Y2 whorls; subsequent whorls rather flat, compressed and ap- 

 pressed at and in front of suture, with a rounded base and in- 

 conspicuous anal fasciole; sculpture chiefly of flatfish spiral 

 threads, one at suture, 3 smaller ones in front of it, followed by 

 a flat broader one representing the fasciole, then (on the last 

 whorl 8) more prominent threads, undulate or segmented by in- 

 cremental lines and with wider interspaces (sometimes contain- 

 ing an intercalary smaller thread) to base, followed by 6 or 7 

 unsegmented threads to the siphonal fasciole, which bears 6 or 

 7 smaller threads; the succession of undulations or slightly swol- 

 len segments gives a slightly cancellate effect to the part of whorl 

 which bears them, but there are no axial ribs, the effect of being 

 produced rather by depressions between the rather coarse incre- 

 mental lines; aperture narrow, acute behind, the anal sulcus nar- 

 row and distinct but not very deep, the outer lip in front of it 

 arcuately produced, the canal contracted, short, and recurved; 

 inner lip polished and superficially erased; pillar twisted, with a 

 thin layer of callus; operculum present as in T. ophioderma. 

 Height of shell 23, of last whorl 12.5, of aperture and canal 8, 

 max. diam. 7 mm. 



Type locality: — off Coronado Beach, San Diego, Cal., in 10 

 fms. (F. W. Kelsey). 



Also found at San Pedro by various collectors. 



1462 Acanthina lapilloides aurantia Dall. 



Type locality: — on rocks at San Pedro, Cal. (Dr. R. H. Trem- 

 fer). 



An orange-yellow color variety, slightly smaller than the typ- 

 ical form, with the interspaces of the spiral threads prettily 1am- 

 ellose axially and more or less articulated with blackish brown 

 small spots. 



1463 Tritonofusus (Plicifusus) Kelseyi Dall. 



Shell elongate, slender, acute, the spire much larger than the 

 aperture; white, covered by an olivaceous periostracum; having 

 10 whorls exclusive of the (eroded) nucleus of about 2 whorls; 

 suture appressed and the whorls slightly constricted in front of 

 it; axial sculpture of (on 7th whorl about 12) concavely arcuate, 

 slightly protractive, low narrow ribs, crossing the whorls, on the 

 later whorls becoming obsolete and finally absent from the last 

 whorl altogether; interspaces wider than ribs; these are crossed 

 by fine sharp spiral striae, somewhat irregularly spaced, of which 

 there are about 12 on the 7th whorl, a narrow space before the 

 suture being less sharply or not at all striate; aperture narrow, 

 outer lip arcuate, somewhat excavated near 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, nar- 

 row, straight; length of shell 34, of last whorl 18.5, of aperture 

 14.5, max. diam. 8 mm. 



Type locality: — off San Diego, Cal., in 124-359 fms. 



Named in honor of P. W. Kelsey, who dredged it off San Diego 

 in 50 fms. Found in the Pleistocene at San Pedro, Cal. (Esh- 

 naur). 



1464 Boreotrophon Bentleyi Dall. 



Shell small, slender, acute, ashy white, with about 7 whorls; 



