246 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Buccinum viridum Dali, 1889 
Proceedings of the United States National Museum, 12:320; PI. 6, fig. 9. 
Shell delicate, thin, inflated, six-whorled, with a delicate greenish gray, 
slightly fringed, dehiscent epidermis; spiral sculpture of numerous sub¬ 
equal flattish threads, with narrower rounded interspaces and no intercalary 
threads; these threads are, as usual, slightly coarser on the base and finer 
behind the shoulder of the whorl near the suture; at the shoulder a single 
more prominent but not much larger thread slightly turriculates the spire; 
whorls full and rounded, especially on the base; suture distinct but not 
channeled; aperture wide, outer lip somewhat patulous in front, receding 
toward the suture; canal wide, short, hardly discriminated from the aper¬ 
ture, very slightly recurved; fasciole distinct but not prominent; pillar 
thin, twisted; inner lip smooth, white, slightly excavated, or the limy 
outer layer of the shell is there absorbed and the space covered with a thin 
wash of polished glaze; except for the epidermis the shell is pure white. 
The outer layer is very thin and but slightly reflected. The nucleus is 
eroded on the surface so that its character is not determinable. Max. long, 
of shell, 46; of aperture, 24; max. lat., 29 mm. (Dali.) 
Type in United States National Museum. Type locality, Station 2839, 
off Santa Barbara Islands, California. 
Range. Santa Barbara Islands, California, in 414 fathoms. 
Buccinum planeticum Dali, 1919 
Plate 24, fig. 1 
Proceedings of the United States National Museum, 56 :326. 
Female shell of moderate size, acute, with a distinct not constricted 
suture and seven rounded whorls exclusive of the (lost) nucleus; shell 
of a warm buff color, the thin periostracum dehiscent; axial sculpture of 
on the upper whorls, about a dozen low obscure ribs only apparent behind 
the periphery and absent on the last whorl; the lines of growth are hardly 
perceptible; spiral sculpture of very fine close threads, raised slightly into 
fasciculate bands of five or six threads, the interspaces more distinctly 
defined on the base than behind the periphery; this sculpture covers the 
whole shell; the aperture wide, the margin in the type-specimen deeply 
sulcate behind, hardly reflected, patulous in front; body erased, pillar 
nearly straight; canal very short, wide, sharply recurved with a feeble 
fasciole. Height of shell, 65 ; of last whorl, 45; diameter, 35. (Dali.) 
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